ORCID Profile
0000-0002-5930-1364
Current Organisation
University of New South Wales
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Electrochemistry | Functional Materials | Macromolecular and Materials Chemistry | Condensed Matter Imaging | Nanochemistry and Supramolecular Chemistry | Materials Engineering
Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Energy Storage (excl. Hydrogen) | Expanding Knowledge in Technology |
Publisher: Wiley
Date: 28-10-2021
Abstract: Rechargeable aluminum batteries (AlBs), which represent cost‐effective energy‐storage devices due to the abundance of natural aluminum resources, have emerged as promising candidates for the next generation of rechargeable batteries. Although the electrochemical deposition of aluminum in ionic liquids (ILs) is well investigated for aluminum refining, the reversible electrochemical deposition/dissolution behavior of aluminum ions is not trivial. More specifically, the dendrite growth issue, which is common in Li metal anodes, is scarcer or vague. Herein, the electrochemical stability of the aluminum metal anode in IL electrolytes is investigated and the failure mechanism is discussed. It is confirmed that the inorganic anion of ILs mainly affects the electrochemical stability, whereas the organic cation influences the aluminum metal degradation. X‐ray computed tomography results further identify deterioration of the surface morphology of the aluminum metal. The formation of “dead aluminum” is further confirmed, which indeed causes cell failure with repeated cycles. Finally, using the predeposited aluminum graphene paper as an alternative anode candidate for AlBs is further demonstrated.
Publisher: American Chemical Society (ACS)
Date: 29-04-2016
DOI: 10.1021/JACS.6B02086
Abstract: Designing small-molecule organic redox-active materials, with potential applications in energy storage, has received considerable interest of late. Herein, we report on the synthesis, characterization, and application of two rigid chiral triangles, each of which consist of non-identical pyromellitic diimide (PMDI) and naphthalene diimide (NDI)-based redox-active units. (1)H and (13)C NMR spectroscopic investigations in solution confirm the lower symmetry (C2 point group) associated with these two isosceles triangles. Single-crystal X-ray diffraction analyses reveal their rigid triangular prism-like geometries. Unlike previously investigated equilateral triangle containing three identical NDI subunits, both isosceles triangles do not choose to form one-dimensional supramolecular nanotubes by dint of [C-H···O] interaction-driven columnar stacking. The rigid isosceles triangle, composed of one NDI and two PMDI subunits, forms-in the presence of N,N-dimethylformamide-two different types of intermolecular NDI-NDI and NDI-PMDI π-π stacked dimers with opposite helicities in the solid state. Cyclic voltammetry reveals that both isosceles triangles can accept reversibly up to six electrons. Continuous-wave electron paramagnetic resonance and electron-nuclear double-resonance spectroscopic investigations, supported by density functional theory calculations, on the single-electron reduced radical anions of the isosceles triangles confirm the selective sharing of unpaired electrons among adjacent redox-active NDI subunit(s) within both molecules. The isosceles triangles have been employed as electrode-active materials in organic rechargeable lithium-ion batteries. The evaluation of the structure-performance relationships of this series of diimide-based triangles reveals that the increase in the number of NDI subunits, replacing PMDI ones, within the molecules improves the electrochemical cell performance of the batteries.
Publisher: Elsevier BV
Date: 09-2014
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA04376E
Abstract: A novel way of absorbing sulfur species by a vascular system of lignocellulosic fibers and hollow VO 2 achieved ultrahigh areal capacity, and the extraordinary adsorption behavior was characterized by operando Raman spectroscopy.
Publisher: Elsevier BV
Date: 05-2022
Publisher: Wiley
Date: 06-07-2023
Abstract: Anode‐free lithium metal batteries (AFLMBs) show promise as a means of further enhancing the energy density of current lithium‐ion batteries, as they do not require conventional graphite anodes. The anode‐free configuration, however, suffers from inferior chemical stability of the solid electrolyte interphase (SEI) layer and experiences inhomogeneous lithium deposition during charge/discharge processes, resulting in rapid capacity fading. To address these issues, a carbonized polydopamine (CPD) coating is applied to the copper current collector. The CPD‐coated copper current collector promotes highly efficient and reversible lithium plating and stripping processes, resulting in a densely packed lithium deposition that significantly improves cycling stability. The anode‐free full cell, consisting of CPD‐coated copper current collector and a LiFePO 4 cathode, demonstrates significantly improved electrochemical performance, with a capacity retention of more than 63% after 100 cycles at a current rate of 0.3C. The stability of the SEI layer and the presence of lithiophilic sites are verified through a range of techniques, including optical microscopy, Raman spectroscopy, X‐ray photoelectron spectroscopy, chrono erometry, and electrochemical impedance spectroscopy. Based on these collective findings, it can be inferred that the use of CPD coating provides a simple way to enhance the electrochemical performance of AFLMBs.
Publisher: Wiley
Date: 28-06-2018
Abstract: Artificial molecular machines can be operated using either physical or chemical inputs. Light-powered motors display clean and autonomous operations, whereas chemically driven machines generate waste products and are intermittent in their motions. Herein, we show that controlled changes in applied electrochemical potentials can drive the operation of artificial molecular pumps in a semi-autonomous manner-that is, without the need for consecutive additions of chemical fuel(s). The electroanalytical approach described in this Communication promotes the assembly of cyclobis(paraquat-p-phenylene) rings along a positively charged oligomeric chain, providing easy access to the formation of multiple mechanical bonds by means of a controlled supply of electricity.
Publisher: American Chemical Society (ACS)
Date: 19-07-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02825F
Abstract: We report a new, surfactant-free method to produce Co 3 O 4 nanocrystals with controlled sizes and high dispersity by caging templation of nanoporous networks.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA21239K
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Chemical Society (ACS)
Date: 05-11-2020
Publisher: American Chemical Society (ACS)
Date: 02-01-2020
DOI: 10.1021/JACS.9B12436
Abstract: Aqueous rechargeable zinc batteries (ZBs) have received considerable attention recently for large-scale energy storage systems in terms of rate performance, cost, and safety. Nevertheless, these ZBs still remain a subject for investigation, as researchers search for cathode materials enabling high performance. Among the various candidate cathode materials for ZBs, quinone compounds stand out as candidates because of their high specific capacity, sustainability, and low cost. Quinone-based cathodes, however, suffer from the critical limitation of undergoing dissolution during battery cycling, leading to a deterioration in battery life. To address this problem, we have introduced a redox-active triangular phenanthrenequinone-based macrocycle (
Publisher: Wiley
Date: 19-06-2021
Abstract: Layered transition metal oxides, in particular P2‐type ones, are considered as promising cathode materials for sodium‐ion batteries on account of their high specific capacity and rate capability. Nevertheless, conventional layered compounds involve detrimental phase transformation throughout repeated cycles, which results in electrochemical performance degradation. Therefore, finding structurally stable layered compounds, featuring minimal phase transition has been a key theme of the sodium‐ion battery research. Here lithium substituted Fe/Mn‐based P2/O3 layered oxide—Na 0.67 Li 0.2 Fe 0.2 Mn 0.6 O 2 —that overcomes the inherited structural instability, is reported. In situ synchrotron‐based diffraction measurements and DFT calculations are utilized, in order to identify the association between P2/O3 biphasic structure and electrochemical performances. The lithium honeycomb ordering within the P2/O3 biphasic layered compound effectively constrains the undesirable phase transitions more specifically, both P2‐Z phase transition and Jahn–Teller distortion are suppressed throughout wide potential range of 1.5–4.5 V. The DFT calculation further discovers that the presence of honeycomb ordering is crucial for achieving the structural stability by forming Na–vac–Li and Na–Li–Na pairing at highly charged state. The results highlight that the synergetic effect of P2/O3 biphasic structure and lithium substitution can provide an effective strategy toward achieving electrochemically stable layered cathode material for sodium‐ion batteries.
Publisher: American Chemical Society (ACS)
Date: 25-07-2022
Publisher: Elsevier BV
Date: 12-2013
Publisher: Springer Science and Business Media LLC
Date: 03-12-2018
Publisher: Elsevier BV
Date: 04-2022
Publisher: Wiley
Date: 19-04-2014
Publisher: American Chemical Society (ACS)
Date: 08-04-2021
DOI: 10.1021/JACS.0C13388
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Chemical Society (ACS)
Date: 24-04-2017
DOI: 10.1021/JACS.7B01209
Abstract: Organic rechargeable batteries, composed of redox-active molecules, are emerging as candidates for the next generation of energy storage materials because of their large specific capacities, cost effectiveness, and the abundance of organic precursors, when compared with conventional lithium-ion batteries. Although redox-active molecules often display multiple redox states, precise control of a molecule's redox potential, leading to a single output voltage in a battery, remains a fundamental challenge in this popular field of research. By combining macrocyclic chemistry with density functional theory calculations (DFT), we have identified a structural motif that more effectively delocalizes electrons during lithiation events in battery operations-namely, through-space electron delocalization in triangular macrocyclic molecules that exhibit a single well-defined voltage profile-compared to the discrete multiple voltage plateaus observed for a homologous macrocyclic dimer and an acyclic derivative of pyromellitic diimide (PMDI). The triangular macrocycle, incorporating three PMDI units in close proximity to one another, exhibits a single output voltage at 2.33 V, compared with two peaks at (i) 2.2 and 1.95-1.60 V for reduction and (ii) 1.60-1.95 and 2.37 V for oxidation of the acyclic PMDI derivative. By investigating the two cyclic derivatives with different conformational dispositions of their PMDI units and the acyclic PMDI derivative, we identified noticeable changes in interactions between the PMDI units in the two cyclic derivatives under reducing conditions, as determined by differential pulse voltammetry, solution-state spectroelectrochemistry, and variable-temperature UV-Vis spectra. The numbers and relative geometries of the PMDI units are found to alter the voltage profile of the active materials significantly during galvanostatic measurements, resulting in a desirable single plateau for the triangular macrocycle. The present investigation reveals that understanding and controlling the relative conformational dispositions of redox-active units in macrocycles are key to achieving high energy density and long cycle-life electrodes for organic rechargeable batteries.
Publisher: The Electrochemical Society
Date: 09-2019
Abstract: Since aluminum is the third most abundant element in Earth’s crust, developing rechargeable aluminum-ion offers 1 a golden opportunity for delivering a high energy-to-price ratio. Nevertheless, finding appropriate host electrodes for inserting aluminum (complex) ion remains a fundamental challenge. Here, we demonstrate 2 a new strategy for designing active materials for rechargeable aluminum batteries. This strategy entails the use of redox-active triangular phenanthrenequinone-based macrocycles which form layered superstructures resulting in the reversible insertion and extraction of cationic aluminum complex. This architecture exhibits an outstanding electrochemical performance with a reversible capacity of 110 mAh g –1 along with a superior cyclability of up to 5000 cycles. Furthermore, we prepared a hybrid electrode by blending the macrocycle with graphite flakes, featuring homogeneous stacking of both macrocycle and graphite flake. These findings lay the groundwork for future design and operation of aluminium-ion batteries and represent a promising starting point for developing affordable large-scale energy storage applications. References M. -C. Lin , et al. Nature 2015 , 520 , 324–328. D. J. Kim, D.-J. Yoo, M. T. Otley, A. Prokofjevs, C. Pezzato, M. Owczarek, S. J. Lee, J. W. Choi, and J. F. Stoddart, Nat. Energy , 2019 , 4 , 51–59. Figure 1
Publisher: American Chemical Society (ACS)
Date: 13-03-2012
DOI: 10.1021/CM300065Y
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 03-2022
Start Date: 06-2021
End Date: 06-2025
Amount: $417,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2022
End Date: 12-2023
Amount: $738,750.00
Funder: Australian Research Council
View Funded Activity