ORCID Profile
0000-0001-6352-7633
Current Organisations
Deakin University
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CSIRO
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Publisher: Wiley
Date: 09-01-2013
Publisher: Elsevier BV
Date: 12-2015
Publisher: American Chemical Society (ACS)
Date: 31-07-2013
DOI: 10.1021/MA401256N
Publisher: American Chemical Society (ACS)
Date: 12-01-2022
Abstract: A series of hybrid electrolytes composed of diglyme and ionic liquids (ILs) have been investigated for Na-O
Publisher: American Chemical Society (ACS)
Date: 08-06-2021
Publisher: American Chemical Society (ACS)
Date: 02-06-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8CP07254J
Abstract: In this work we demonstrate that imidazolium cations with short alkyl chains can form a self-assembled structure in aqueous solution.
Publisher: American Chemical Society (ACS)
Date: 05-12-2019
Abstract: We discuss here the time-temperature scaling and dielectric modeling of the variation of single-ion conductivity with frequency of first generation (G
Publisher: Springer Science and Business Media LLC
Date: 19-04-2016
DOI: 10.1038/SREP24499
Abstract: Electrochemical device with components having direct significance to biological life processes is a potent futuristic strategy for the realization of all-round green and sustainable development. We present here synthesis design, structural analysis and ion transport of a novel solid organic electrolyte (G7Li), a compound reminiscent of ion channels, derived from regioisomeric N7-guanine-carboxylate conjugate and Li-ions. G7Li, with it’s in-built supply of Li + -ions, exhibited remarkably high lithium-ion transference number (= 0.75) and tunable room temperature ionic conductivity spanning three decades (≈10 −7 to 10 −3 Ω −1 cm −1 ) as a function of moisture content. The ionic conductivity show a distinct reversible transition around 80–100 °C, from a dual Li + and H + ( °C) to a pure Li + conductor ( °C). Systematic studies reveal a transition from water-assisted Li-ion transport to Li hopping-like mechanism involving guanine-Li coordination. While as-synthesized G7Li has potential in humidity sensors, the anhydrous G7Li is attractive for rechargeable batteries.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA01562J
Abstract: Incorporation of phosphotungstic acid functionalized mesoporous silica increases the stable operation temperature of PA/PBI membranes to 200 °C.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA09049D
Abstract: An in situ polymerization strategy was used to functionalize graphene oxide (GO) with poly( N , N -dimethyl amino ethylmethacrylate) (PDMAEMA) for the selective removal of anionic dyes.
Publisher: American Chemical Society (ACS)
Date: 04-10-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CC02151F
Abstract: This article provides an overview of nuclear magnetic resonance methods and applications to ionic liquids and organic ionic plastic crystals.
Publisher: American Chemical Society (ACS)
Date: 20-07-2020
Publisher: American Chemical Society (ACS)
Date: 25-01-2019
Publisher: Elsevier BV
Date: 2016
Publisher: No publisher found
Date: 2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CP01910H
Abstract: In this study we present a detailed exploration of the complex structural and dynamic behavior of [HMG][FSI] mixtures with the sodium salt NaFSI across the whole composition range from 0 to 100 mol%.
Publisher: Elsevier BV
Date: 04-2020
Publisher: Wiley
Date: 03-03-2011
DOI: 10.1002/APP.33469
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA03502E
Abstract: Organic salts are being considered for the electrolyte solvent in rechargeable lithium-metal batteries (LMBs).
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 07-2012
Publisher: Wiley
Date: 13-05-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP00205B
Abstract: A novel phosphonium ionic liquid as potential candidate for lithium battery electrolytes.
Publisher: Wiley
Date: 13-05-2020
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.CARBPOL.2018.08.057
Abstract: Exhaustion dyeing of cotton means a significant proportion of dyestuff is not fixed onto the material and is drained out when the dyebath is emptied. This waste presents issues for dye houses in terms of remediating water quality and the loss of expensive dye chemicals. Work to improve the dyeing ability of cotton has been limited to modifying cotton's cellulose structure by, notionally, environmentally hazardous treatments, e.g., concentrated caustic soda. Here we use a buffered, aqueous glycine treatment to improve the dyeing ability of cotton. The treated cotton showed improved dye absorption compared with control s les. An investigation of the structure of the treated cotton using Fourier Transform Infrared spectroscopy (FTIR) and
Publisher: American Chemical Society (ACS)
Date: 20-10-2017
DOI: 10.1021/ACS.JPCLETT.7B02439
Abstract: Polymeric ionic liquids have emerged recently as a promising alternative to traditional polymers as the polymer electrolyte membrane materials of choice because of their strongly decoupled dynamics between the polymer backbone and the counterions. Knowledge of proton exchange and transport mechanism in such materials is critical to the design and development of new poly(ionic liquid) materials with improved electrochemical properties. Our NMR results show that the proton exchange between the labile proton of the diethylmethylammonium (NH122) cation and H
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 11-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0MA00992J
Abstract: Ion dynamics enhancements derived from anion–polymer interactions are proposed in organic ionic plastic crystal–poly(vinylidene fluoride)composite electrolytes.
Publisher: The Royal Society of Chemistry
Date: 21-06-2021
DOI: 10.1039/9781839160097-00323
Abstract: The development of high-performance electrolytes, which possess high ionic conductivity, good chemical and electrochemical stabilities, and robust mechanical properties, is essential to realizing the next-generation rechargeable Li-ion batteries with higher energy and power densities and superior safety. Solid electrolytes are considered to be promising replacements for conventional liquid electrolytes, which are flammable and incompatible with Li metal anodes. Organic solids, including organic ionic plastic crystals and polymers, and organic–inorganic composites have attracted attention in recent decades owing to their favourable flexibility and good wettability. Advanced solid-state NMR techniques are powerful tools in the study of the structure and ion dynamics of organic and organic–inorganic composite solid electrolytes, which will be discussed in detail in this chapter.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA11175A
Abstract: The combination of a highly conductivity plastic crystal with a very high concentration of lithium salt results in a promising new “plastic crystal in salt” electrolyte for lithium metal batteries.
Publisher: Elsevier BV
Date: 12-2016
Publisher: The Electrochemical Society
Date: 05-01-2020
Abstract: In this work, we present a polymerized ionic liquid block copolymer (PBCP) film where relevant properties such as ionic conductivity and electrochemical parameters are tailored by using a ternary system comprised of poly(styrene-b-1-((2-acryloyloxy)ethyl)−3-butylimidazolium bis(tri-fluoromethanesulfonyl)imide), LiFSI salt and ethylene carbonate (EC) as a cosolvent. It was found that EC efficiently decreases the glass transition temperature of the ionic block, resulting in an improved ionic conductivity and efficient platting/stripping of lithium. By using an optimal ratio of EC/LiFSI at relatively high LiFSI amount, Li∣Li symmetrical cells at 50 °C show an overpotential as low as 70 mV at 0.1 mA.cm −2 along with a high lithium transport number of 0.56 (t Li + ). All-solid-state full cells based on lithium iron phosphate cathode paired with a lithium metal anode reveal a rather stable cycling at both 50 °C and 70 °C. A negligible capacity fading is observed up to 30 cycles where a specific capacity as high as 161 mAh.g −1 is achieved with a coulombic efficiency of 99.9%. Thus, this work demonstrates an important pathway for tailoring the properties of solid state polymer electrolytes for emerging and specially designed block copolymer architectures comprising domains that give both excellent ionic conduction along with desirable mechanical properties.
Publisher: Elsevier BV
Date: 09-2015
Publisher: MDPI AG
Date: 05-03-2020
Abstract: In the present article, we report on the chemical modifications of some carbohydrate-based substrates, such as potato starch, dextran, β-cyclodextrin, agar agar and tamarind, by reacting with diethylchlorophosphate (DECP), in dispersions in dichloromethane (DCM), in the presence of triethylamine (TEA) as the base. The modified substrates, after recovery and purification, were analyzed for their chemical constitutions, thermal stabilities and calorimetric properties using a variety of analytical techniques. These included: solid-state 31P NMR, inductively coupled plasma-optical emission spectroscopy (ICP-OES), thermogravimetric analysis (TGA) and pyrolysis combustion flow calorimetry (PCFC). The unmodified counterparts were also subjected to the same set of analyses with a view to serving as controls. Phosphorus analyses, primarily through ICP-OES on the recovered s les, showed different degrees of incorporation. Such observations were optionally verified through solid-state 31P NMR spectroscopy. The thermograms of the modified substrates were noticeably different from the unmodified counterparts, both in terms of the general profiles and the amounts of char residues produced. Such observations correlated well with the relevant parameters obtained through PCFC runs. Overall, the modified systems containing phosphorus were found to be less combustible than the parent substrates, and thus can be considered as promising matrices for environmentally benign fire-resistant coatings.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 24-02-2020
Publisher: Wiley
Date: 06-02-2019
Abstract: The anion chemistry of lithium salts plays a pivotal role in dictating the physicochemical and electrochemical performance of solid polymer electrolytes (SPEs), thus affecting the cyclability of all-solid-state lithium metal batteries (ASSLMBs). The bis(trifluoromethanesulfonyl)imide anion (TFSI
Publisher: American Chemical Society (ACS)
Date: 25-08-2021
DOI: 10.26434/CHEMRXIV-2021-TMG9M
Abstract: Composite solid electrolytes including inorganic nanoparticles or nanofibers which improve the performance of polymer electrolytes due to their superior mechanical, ionic conductivity or lithium transference number are actively being searched for applications in lithium metal batteries. However, inorganic nanoparticles present limitations such as its tedious surface functionalization and agglomeration issues and poor homogeneity at high concentrations in polymer matrices. In this work, we report on polymer nanoparticles with lithium sulfonamide surface functionality (LiPNP) for application as electrolytes in lithium metal battery. The particles are prepared by semibatch emulsion polymerization, an easily up–scalable technique. LiPNPs are used to prepare two different families of particle reinforced solid electrolytes. When mixed with polyethylene oxide and lithium bis(trifluoromethane)sulfonimide (LiTFSI/PEO), the particles provoke a significant stiffening effect (E´ 106 Pa vs. 105 Pa at 80 ºC) while retaining high ionic conductivity (σ = 6.6 × 10–4 S cm–1). Preliminary testing in LiFePO4 full cells, showed promising performance of the PEO nanocomposite electrolytes. By mixing the particles with propylene carbonate without any additional salt, we obtain true single ion conducting gel electrolytes as the lithium sulfonamide surface functionalities are the only sources of lithium ions in the system. The gel electrolytes are mechanically robust (up to G´ =106 Pa) and show ionic conductivity up to 10–4 S cm–1. Finally, the PC nanocomposite electrolytes were tested in symmetrical lithium cells. Our findings suggest that all–polymer nanoparticles could represent a new building block material for solid–state lithium metal battery applications.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA13344C
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1QM00648G
Abstract: The synthesis and characterisation of a series of new oxazolidinium-based salts shows that ether functionality in the ring can have beneficial impacts on properties including ionic conductivity.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5SC04584C
Abstract: The proposed dendrimer based liquid electrolyte is a single-ion conductor where ion transport is altered by the nature of the chemical functionalities leading to large variations in anion diffusion and hence ionic transference number.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 03-2015
Publisher: Wiley
Date: 15-10-2019
Abstract: Homochiral metal-organic framework (MOF) membranes have been recently reported for chiral separations. However, only a few high-quality homochiral polycrystalline MOF membranes have been fabricated due to the difficulty in crystallization of a chiral MOF layer without defects on porous substrates. Alternatively, mixed matrix membranes (MMMs), which combine potential advantages of MOFs and polymers, have been widely demonstrated for gas separation and water purification. Here we report novel homochiral MOF-polymer MMMs for efficient chiral separation. Homochirality was successfully incorporated into achiral MIL-53-NH
Publisher: Wiley
Date: 04-05-2017
Publisher: Wiley
Date: 28-03-2019
Abstract: The effect of water on the properties of superconcentrated sodium salt solutions in ionic liquids (ILs) was investigated to design electrolytes for sodium battery applications with water as an additive. Water was added to a 50 mol % solution of NaFSI [FSI=bis(fluorosulfonyl)imide] in the ionic liquid N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C
Publisher: Informa UK Limited
Date: 24-01-2022
Publisher: American Chemical Society (ACS)
Date: 08-03-2010
DOI: 10.1021/MA100168G
Publisher: Informa UK Limited
Date: 11-2010
Publisher: Elsevier BV
Date: 12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA06927B
Abstract: This work highlights the importance of both the surface chemistry and the persistence length of crystalline pores in COFs. Protons are found to transfer predominantly through grain boundary regions instead of the crystalline pores.
Publisher: Wiley
Date: 21-07-2017
Abstract: Organic ionic plastic crystals (OIPCs) are a class of solid-state electrolytes with good thermal stability, non-flammability, non-volatility, and good electrochemical stability. When prepared in a composite with electrospun polyvinylidene fluoride (PVdF) nanofibers, a 1:1 mixture of the OIPC N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide ([C
Publisher: Elsevier BV
Date: 02-2022
Publisher: American Chemical Society (ACS)
Date: 11-08-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CP01173H
Abstract: In the present investigation, the crystallization and phase transition behaviours of normal alkane (n-docosane) in microcapsules with a mean diameter of 3.6 μm were studied by the combination of differential scanning calorimetry (DSC), temperature-dependent X-ray diffraction (XRD) and variable-temperature solid-state nuclear magnetic resonance (VT solid-state (13)C NMR). The DSC and VT solid-state (13)C NMR results reveal that a surface freezing monolayer is formed prior to the bulk crystallization of the microencapsulated n-docosane. More interestingly, it is confirmed that after the bulk crystallization, the ordered triclinic phase coexists with the rotator phase I (RI) for the microencapsulated n-docosane. We argue that the reduction of the free energy difference between the two phases, resulting from the microencapsulation process, leads to the coexistence of the ordered triclinic and rotator phases of the normal alkanes.
Publisher: American Chemical Society (ACS)
Date: 07-12-2017
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 08-2007
Publisher: American Chemical Society (ACS)
Date: 22-02-2022
Publisher: American Chemical Society (ACS)
Date: 28-06-2018
DOI: 10.1021/ACS.JPCLETT.8B01500
Abstract: A fundamental understanding of the structure and dynamics of organic ionic plastic crystal (OIPC) materials allows for a more rational design of molecular chemistry toward improved mechanical and electrochemical performances. This Letter investigates the solid-state structure and ion dynamics of two imidazolium-based protic organic ionic plastic crystals as well as the ion-transport properties in both compounds. A combination of DSC, conductivity, NMR, and synchrotron X-ray studies revealed that a subtle change in cation chemistry results in substantial differences in the thermal phase behavior, crystalline structures, as well as the ion conduction mechanisms in the protic plastic crystal compounds. Whereas most of the research nowadays has been focused on the optimization of chemistry of cations and anions, this work highlights the importance of microstructures on the ion transport rate and pathways of the OIPC materials.
Publisher: Wiley
Date: 05-08-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 2012
DOI: 10.1016/J.JMR.2011.11.009
Abstract: High spatial resolution NMR imaging techniques have been developed recently to measure the spatial inhomogeneity of a polymer coating film. However, the substrates of the polymer coatings for such experiments are generally required to be non-metallic, because metals can interact with static magnetic fields B(0) and RF fields B(1) giving rise to artifacts in NMR images. In this paper we present a systematic study on the effects of metallic substrates on 1D profiles obtained by high resolution NMR imaging. The off-resonance effect is discussed in detail in terms of the excitation profile of the RF pulses. We quantitatively show how the NMR signal intensities change with frequency offset at different RF pulse lengths. The complete NMR profiles were simulated using a Finite Element Analysis method by fully considering the inhomogeneities in both B(1) and B(0). The excellent agreement between the calculated and measured NMR profiles on both metallic and non-metallic substrates indicates that the experimental NMR profiles can be reproduced very well by numerical simulations. The metallic substrates can disturb the RF field of the coil by eddy current effect and therefore change the NMR profiles. To quantitatively interpret the NMR profile of a polymer layer on a metallic substrate, the profile has to be ided by the profile of a reference on the same metallic substrate located at the same distance from the coil.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02817A
Abstract: Organic ionic plastic crystal (OIPC) modified poly(vinylidene difluoride) (PVDF) composite fiber membrane with enhanced ion dynamics and almost pure β-PVDF are demonstrated.
Publisher: American Chemical Society (ACS)
Date: 31-05-2022
DOI: 10.1021/JACS.2C02260
Abstract: Polymer electrolytes (PEs) with excellent flexibility, processability, and good contact with lithium metal (Li°) anodes have attracted substantial attention in both academic and industrial settings. However, conventional poly(ethylene oxide) (PEO)-based PEs suffer from a low lithium-ion transference number (
Publisher: Elsevier BV
Date: 05-2015
DOI: 10.1016/J.JCIS.2014.12.053
Abstract: Hollow mesoporous silica nanoparticles (HMSNs) are one of the most promising carriers for effective drug delivery due to their large surface area, high volume for drug loading and excellent biocompatibility. However, the non-ionic surfactant templated HMSNs often have a broad size distribution and a defective mesoporous structure because of the difficulties involved in controlling the formation and organization of micelles for the growth of silica framework. In this paper, a novel "Eudragit assisted" strategy has been developed to fabricate HMSNs by utilising the Eudragit nanoparticles as cores and to assist in the self-assembly of micelle organisation. Highly dispersed mesoporous silica spheres with intact hollow interiors and through pores on the shell were fabricated. The HMSNs have a high surface area (670 m(2)/g), small diameter (120 nm) and uniform pore size (2.5 nm) that facilitated the effective encapsulation of 5-fluorouracil within HMSNs, achieving a high loading capacity of 194.5 mg(5-FU)/g(HMSNs). The HMSNs were non-cytotoxic to colorectal cancer cells SW480 and can be bioconjugated with Epidermal Growth Factor (EGF) for efficient and specific cell internalization. The high specificity and excellent targeting performance of EGF grafted HMSNs have demonstrated that they can become potential intracellular drug delivery vehicles for colorectal cancers via EGF-EGFR interaction.
Publisher: Wiley
Date: 18-09-2014
Abstract: Elucidating the rate and geometry of molecular dynamics is particularly important for unravelling ion-conduction mechanisms in electrochemical materials. The local molecular motions in the plastic crystal 1-ethyl-1-methylpyrrolidinium tetrafluoroborate ([C2 mpyr][BF4 ]) are studied by a combination of quantum chemical calculations and advanced solid-state nuclear magnetic resonance spectroscopy. For the first time, a restricted puckering motion with a small fluctuation angle of 25° in the pyrrolidinium ring has been observed, even in the low-temperature phase (-45 °C). This local molecular motion is deemed to be particularly important for the material to maintain its plasticity, and hence, its ion mobility at low temperatures.
Publisher: American Chemical Society (ACS)
Date: 03-11-2021
Publisher: Springer Science and Business Media LLC
Date: 17-09-2015
Publisher: American Chemical Society (ACS)
Date: 12-2014
DOI: 10.1021/JP5101472
Publisher: American Chemical Society (ACS)
Date: 27-09-2021
Publisher: Wiley
Date: 17-05-2010
Publisher: American Chemical Society (ACS)
Date: 29-12-2008
DOI: 10.1021/MA702324H
Publisher: American Chemical Society (ACS)
Date: 18-02-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA00368K
Abstract: Nanoscale proton-channels endow a polyelectrolyte membrane with exciting anhydrous proton conductivity, making it attractive for high-temperature PEMFC applications.
Publisher: Elsevier BV
Date: 10-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3SM52106K
Abstract: Articular cartilage is an ex le of a highly efficacious water-based, natural lubrication system that is optimized to provide low friction and wear protection at both low and high loads and sliding velocities. One of the secrets of cartilage's superior tribology comes from a unique, multimodal lubrication strategy consisting of both a fluid pressurization mediated lubrication mechanism and a boundary lubrication mechanism supported by surface bound macromolecules. Using a reconstituted network of highly interconnected cellulose fibers and simple modification through the immobilization of polyelectrolytes, we have recreated many of the mechanical and chemical properties of cartilage and the cartilage lubrication system to produce a purely synthetic material system that exhibits some of the same lubrication mechanisms, time dependent friction response, and high wear resistance as natural cartilage tissue. Friction and wear studies demonstrate how the properties of the cellulose fiber network can be used to control and optimize the lubrication and wear resistance of the material surfaces and highlight what key features of cartilage should be duplicated in order to produce a cartilage-mimetic lubrication system.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Wiley
Date: 28-08-2019
Abstract: The conversion of renewable plant polyphenol to advanced materials with tailorable properties and various functions is desirable and challenging. In this work, monovalent cation‐phenolic crystals contained K + or Na + ions were synthesized by using plant polyphenol as an organic source in alkaline solution. The crystal structure was resolved, showing a laminar crystal structure with M + as connecting nodes. The morphologies (e.g., rod‐like and spindle‐shaped) and chemical compositions of crystals could be tuned by changing the cations. Interestingly, these polymer crystals exhibited a pH‐driven reversible crystal transformation. They transformed into their protonated crystalline form under acidic conditions (e.g., pH 2) and went back to the cation‐bound crystalline form in alkaline solutions. Furthermore, the crystals proved excellent antioxidants and heavy metal ion adsorbents.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CP07330E
Abstract: Protic organic ionic plastic crystals based on different anions exhibit more than two orders of magnitude difference in conductivity.
Publisher: American Chemical Society (ACS)
Date: 16-06-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA12827A
Abstract: The interactions between OIPCs and polymer nanoparticles create interfacial layers that control the ion mobility of the resulting composite.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA08233A
Abstract: Poly(ionic liquids)-based gel polymer electrolytes containing high lithium salt concentration ionic liquids are demonstrated.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC07154F
Abstract: A new family of ammonium based organic ionic plastic crystals exhibits exciting solid-state proton conductivity.
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 10-2013
DOI: 10.1016/J.JMR.2013.08.002
Abstract: Static (1)H NMR Free Induction Decay (FID) signals of polymer solids contain a lot of information about the molecular dynamics. A T2 analysis of the FID has generally been performed in terms of discrete two- or three-component models. However, this requires a priori assumption of the number of proton species before analysis. This paper presents a method of analyzing the FIDs of the polymer solid s les in terms of a continuous T2 distribution. A mixed Gaussian and Exponential kernel function was used to represent the true characteristic of FIDs of the polymer solids. A simple and realistic assumption has been made to reduce the number of degrees of freedom in the continuum fitting and to make the fitting stable. An experimental static (1)H NMR FID of a typical polymer solid s le was analyzed as an ex le in the end to demonstrate the application of this method.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1MA00857A
Abstract: A hybrid solid electrolyte prepared by fast UV-photopolymerization of a single-ion polymer network and ceramic garnet LLZO nanoparticles with very high lithium conductivity is reported.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0MA00778A
Abstract: Nano-confinement can selectively change the rotational and translational motion of diethylmethylisobutylphosphonium cation, whereas leaving the hexafluorophosphate anion less affected.
Publisher: Wiley
Date: 10-07-2022
Abstract: In this work, a novel protic polymerized ionic liquid [PSTFSI][Im] is synthesized. The [PSTFSI][Im] polymer presents moderate ionic conductivity and evidences proton activity. Incorporating protic ionic liquid (Protic IL) [MIm][TFSI], the composites present enhanced ionic conductivity, up to 10 −3 S cm −1 at 120 °C upon addition of 60 wt% [MIm][TFSI]. It is found that the [PSTFSI][Im] polymer matrix can promote ion dissociation of the [MIm][TFSI] IL, leading to a larger cation/anion relative mobility compared to the neat Protic IL. This work demonstrates the potential of protic PolyIL as a polymer matrix for proton conductors.
Publisher: Wiley
Date: 04-12-2017
Abstract: Proton conducting polymeric membranes are highly searched in many different technologies ranging from energy to biosensing. Protic ionic liquids and their polymeric version represent a new family of proton conducting molecules with relatively facile synthesis and excellent properties. In this work, protic poly(ionic liquids) having the most popular phosphonium counter-cations are presented for the first time. The synthesis is carried out through proton transfer reactions or through ion exchange reactions by using commercially available tertiary phosphines. Tributyl-, trioctyl-, and tricyclohexyl-phosphine are selected to form the desired cations. Polystyrene sulfonic acid, poly(2-acrylamido-2-methyl-1-propanesulfonic acid), and lithium poly[(4-styrenesulfonyl) (trifluoromethanesulfonyl)imide] polymers are used to form the polymeric anions. The chemical structure of the protic poly(ionic liquids) is confirmed by spectroscopic characterizations such as Fourier transform infrared and nuclear magnetic resonance spectroscopies. Thermal properties of the polymer are characterized by means of differential scanning calorimetry and thermogravimetric analysis. Polymers exhibit good membrane forming ability as well as high ionic conductivities in the range of 10
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CP00365A
Abstract: The physicochemical properties of a range of NaNTf 2 (or NaTFSI) salt concentrations in N -propyl- N -methylpyrrolidinium bis(fluorosulfonyl)imide (or C 3 mpyrFSI) ionic liquid were investigated by DSC, conductivity, cyclic voltammetry and diffusivity studies.
Publisher: The Electrochemical Society
Date: 22-08-2016
Abstract: Inorganic-organic nanostructured hybrid membranes based on polyethersulfone (PES)-polyvinylpyrrolidone (PVP) were prepared with mesoporous silica materials. All the hybrid membranes showed the similar phosphoric acid (PA) uptake. However, the proton conductivity of the PA-PES-PVP membrane was significantly increased after the addition of the inorganic fillers, especially for the amino-functionalized hollow mesoporous silica (NH 2 -HMS). The cell performance test also confirmed the superiority of the PES-PVP membranes with the inorganic fillers. The highest peak power density at 180 o C reached up to 480 mW cm -2 for the NH 2 -HMS based composite membrane fuel cell, which is 92.7 % higher than that of the PA-PES-PVP membrane fuel cell at the identical condition. The outstanding performance of the inorganic-organic hybrid membranes might be due to the facilitated proton transportation in the ordered mesoporous channels, and the great water retention of the inorganic fillers.
Publisher: The Electrochemical Society
Date: 05-01-2020
Abstract: Organic ionic plastic crystals (OIPCs) are increasingly promising as a class of solid-state electrolyte for developing safer lithium batteries. However, their advancement relies on expanding the range of well-characterised cation/anion combinations. Here, we report the synthesis and characterization of OIPCs utilising small ammonium cations tetramethylammonium ([N 1111 ] + ), triethylmethylammonium ([N 1222 ] + ) and tetraethylammonium ([N 2222 ] + ), chosen to encourage significant rotational and translational motion, with the charge-diffuse and electrochemically stable bis(fluorosulfonyl)imide ([FSI]ˉ) and bis(trifluoromethanesulfonyl)imide ([NTf 2 ]ˉ) anions. To investigate the physico-chemical properties of the OIPCs, the free volume was measured by positron annihilation spectroscopy (PALS) and correlated with the ionic conductivity and thermal analysis (DSC). Solid-state NMR analysis of the salts, is also reported. The salts with the less symmetric cation, [N 1222 ][FSI] and [N 1222 ][NTf 2 ], were identified as the most promising electrolyte materials, and thus the electrochemical properties after mixing with 10 and 90 mol% lithium bis(fluorosulfonyl)imide (LiFSI) or lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 ), respectively, were investigated. This study demonstrates the efficacy of these OIPC materials as new quasi-solid state electrolytes with advantageous properties such as high conductivity, good thermal and electrochemical properties, the ability to incorporate high lithium salt concentrations and support efficient lithium electrochemistry.
Publisher: American Chemical Society (ACS)
Date: 21-09-2021
Publisher: AIP Publishing
Date: 28-11-2022
DOI: 10.1063/5.0112647
Abstract: We present here a gel polymer electrolyte, where the Li+-ion transport is completely decoupled from the polymer host solvation and dynamics. A free-standing gel polymer electrolyte with a high volume content (nearly 60%) of xM LiTFSI in G4 (tetraglyme) (x = 1–7 Li+:G4 = 0.2–1.5) liquid electrolyte confined inside the PAN (polyacrylonitrile)-PEGMEMA [poly (ethylene glycol) methyl ether methacrylate oligomer] based polymer matrix is synthesized using a one-pot free radical polymerization process. For LiTFSI concentrations, x = 1–7 (Li+:G4 = 0.2–1.5), Raman and vibrational spectroscopies reveal that like in the liquid electrolyte, the designed gel polymer electrolytes (GPEs) also show direct coordination of Li+-ions with the tetraglyme leading to the formation of [Li(G4)]+. Coupled with the spectroscopic studies, impedance and nuclear magnetic resonance investigations also show that the ion transport is independent of the polymer segmental motion and is governed by the solvated species {[Li(G4)]+}, very similar to the scenario in ionic liquids. As a result, the magnitude of ionic conductivity and activation energies of the gel polymer electrolyte are very similar to that of the liquid electrolyte. The Li+-ion transport number for the GPE varied from 0.44 (x = 1) to 0.5 (x = 7) with the maximum being 0.52 at x = 5.
Publisher: Wiley
Date: 27-11-2018
Abstract: Homochiral metal–organic frameworks (MOFs) have gained much attention because of their chiral properties and disposition for chiral separation. However, the fabrication of high‐quality homochiral MOF membranes remains challenging because of the difficulty in controlling growth of MOF membranes with chiral functionalities. A homochiral zeolitic imidazolate framework‐8 (ZIF‐8) membrane is reported for efficient chiral separation. The membrane is synthesized by incorporating a natural amino acid, l ‐histidine ( l ‐His), into the framework of ZIF‐8. The homochiral l ‐His‐ZIF‐8 membrane exhibits a good selectivity for the R ‐enantiomer of 1‐phenylethanol over the S ‐enantiomer, showing a high enantiomeric excess value up to 76 %.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 27-01-2023
Abstract: Single-ion selectivity with high precision has long been pursued for fundamental bioinspired engineering and applications such as in ion separation and energy conversion. However, it remains a challenge to develop artificial ion channels to achieve single-ion selectivity comparable to their biological analogs, especially for high Na + /K + selectivity. Here, we report an artificial sodium channel by subnanoconfinement of 4′-aminobenzo-15-crown-5 ethers (15C5s) into ~6-Å-sized metal-organic framework subnanochannel (MOFSNC). The resulting 15C5-MOFSNC shows an unprecedented Na + /K + selectivity of tens to 10 2 and Na + /Li + selectivity of 10 3 under multicomponent permeation conditions, comparable to biological sodium channels. A co–ion-responsive single-file transport mechanism in 15C-MOFSNC is proposed for the preferential transport of Na + over K + due to the synergetic effects of size exclusion, charge selectivity, local hydrophobicity, and preferential binding with functional groups. This study provides an alternative strategy for developing potential single-ion selective channels and membranes for many applications.
Publisher: American Chemical Society (ACS)
Date: 14-06-2023
Publisher: Elsevier BV
Date: 07-2007
Publisher: Elsevier BV
Date: 08-2021
Publisher: American Chemical Society (ACS)
Date: 07-09-2017
Abstract: As differentiated from conventional synthetic processes, amino-functionalized hollow mesoporous silica (NH
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA04407C
Abstract: Three dual-cation polymeric ionomers that contain tetraalkylammonium ions and sodium ions have been synthesized and exhibited higher conductivity than the analogous single sodium ion polymers.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CP07415D
Abstract: LiFSI doped [C 2 mpyr][FSI]–PVdF composites were developed as solid-state, self-standing electrolyte membranes.
Publisher: American Chemical Society (ACS)
Date: 25-07-2017
DOI: 10.1021/ACS.JPCLETT.7B01557
Abstract: It is known that hierarchical structure plays a key role in many unique material properties such as self-cleaning effect of lotus leaves and the antifogging property of the compound eyes of mosquitoes. This study reports a series of highly ordered mesoporous Nafion membranes with unique hierarchical structural features at the nanometer scale. Using NMR, we show for the first time that, at low RH conditions, the proton in the ionic domains migrates via a surface diffusion mechanism and exhibits approximately 2 orders of magnitude faster transport than that in the nanopores, whereas the nanopores play a role of reservoir and maintain water and thereby conductivity at higher temperature and lower humidities. Thereby creating hierarchical nanoscale structures is a feasible and promising strategy to develop PEMs that would enable efficient electrochemical performance in devices such as fuel cells, even in the absence of high humidity and at elevated temperatures.
Publisher: Elsevier BV
Date: 02-2015
Publisher: American Chemical Society (ACS)
Date: 06-06-2018
Publisher: American Chemical Society (ACS)
Date: 23-01-2020
Publisher: American Chemical Society (ACS)
Date: 12-07-2019
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 21-08-2014
Abstract: Full conformational and energy explorations are conducted on an organic ionic plastic crystal, 1-ethyl-1-methylpyrrolidium tetrafluoroborate [C2mpyr][BF4]. The onsets of various stages of dynamic behaviour, which appear to account for low-temperature solid-solid phase transitions, are investigated by using quantum-chemical simulations. It is suggested that pseudorotation of the pyrrolidine ring occurs in the first instance the partial rotation of the entire cation subsequently occurs and may be accompanied by reorientation of the ethyl chain as the temperature increases further. A cation-anion configuration, whereby BF4(-) interacts with the C2 mpy cation from the side of the ring, is the most likely structure in the low-temperature phase IV region. These interpretations are supported by (13)C nuclear magnetic resonance chemical-shift analysis.
Publisher: American Chemical Society (ACS)
Date: 18-04-2023
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.JCIS.2016.06.030
Abstract: Silkworm silk fibers are core-shell composites of fibroin and sericin proteins. Studying the interactions between fibroin and sericin is essential for understanding the properties of these composites. It is observed that compared to the domestic silk cocoon Bombyx mori (B. mori), the adhesion between fibroin and sericin from the wild silk cocoon, Antheraea pernyi (A. pernyi), is significantly stronger with a higher degree of heterogeneity. The adsorption of A. pernyi sericin on its fibroin is almost twice the value for B. mori sericin on fibroin, both showing a monolayer Langmuir adsorption. (1)H NMR and FTIR studies demonstrate on a molecular level the stronger interactions and the more intensive complex formation between A. pernyi fibroin and sericin, facilitated by the hydrogen bonding between glycine and serine. The findings of this study may help the design of composites with superior interfacial adhesion between different components.
Publisher: American Chemical Society (ACS)
Date: 16-05-2017
Abstract: Understanding the short-range molecular motions of organic ionic plastic crystals is critical for the application of these materials as solid-state electrolytes in electrochemical devices such as lithium batteries. However, the theory of short-range-motions was originally developed for simple molecular plastic crystals and does not take account of strong interionic interactions that are present in organic ionic plastic crystals. Here we report a fundamental investigation of the dynamic behavior of an archetypal ex le triethyl(methyl)phosphonium bis(fluorosulfonyl)amide ([P
Publisher: Elsevier BV
Date: 07-2017
Publisher: Wiley
Date: 27-11-2018
Abstract: Homochiral metal–organic frameworks (MOFs) have gained much attention because of their chiral properties and disposition for chiral separation. However, the fabrication of high‐quality homochiral MOF membranes remains challenging because of the difficulty in controlling growth of MOF membranes with chiral functionalities. A homochiral zeolitic imidazolate framework‐8 (ZIF‐8) membrane is reported for efficient chiral separation. The membrane is synthesized by incorporating a natural amino acid, l ‐histidine ( l ‐His), into the framework of ZIF‐8. The homochiral l ‐His‐ZIF‐8 membrane exhibits a good selectivity for the R ‐enantiomer of 1‐phenylethanol over the S ‐enantiomer, showing a high enantiomeric excess value up to 76 %.
Publisher: American Chemical Society (ACS)
Date: 03-01-2020
DOI: 10.1021/ACS.JPCLETT.9B03823
Abstract: Organic ionic plastic crystals (OIPCs) are an important family of materials that have shown exciting possibilities as solid electrolytes for lithium ion batteries and other electrochemical devices. In this study we demonstrate for the first time that, although the X-ray shows sharp diffraction peaks, both cation and anion clearly exhibit significant ion diffusion in solid phase I. Two phases with ion diffusivities differing by 2 orders of magnitude can be identified. The populations of the cation and anion in both phases are found to be unequal, hinting at the existence of (negatively charged) cation vacancies in the plastic crystal phase and a positively charged grain boundary phase. These interesting properties of ion vacancies and unequal populations of cation and anion are likely to be ubiquitous in other OIPCs, and it is of paramount importance to be aware of these features to correctly understand the structure-property relationships of this important material family.
Location: Australia
No related grants have been discovered for Haijin Zhu.