ORCID Profile
0000-0003-1742-1752
Current Organisation
RMIT University
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Publisher: American Chemical Society (ACS)
Date: 26-03-2009
DOI: 10.1021/JP810749S
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12989F
Publisher: Elsevier BV
Date: 2012
Publisher: Elsevier BV
Date: 04-2011
Publisher: Elsevier BV
Date: 03-2010
Publisher: Elsevier BV
Date: 10-2008
DOI: 10.1016/J.JCIS.2008.07.012
Abstract: On the basis of a sol-gel process, a facile, low cost, and one-step approach for preparing ordered magnetic mesoporous gamma-Fe(2)O(3)/SiO(2) nanocomposites by an evaporation-induced self-assembly (EISA) approach is presented. Various mesostructured silica materials (P6mm or Im3m) incorporated with different amounts of iron oxide (n(Si)/n(Fe) = 9/1, 8/2, 7/3, respectively) were synthesized and characterized by XRD, TEM, N(2)-sorption analyses, and superconducting quantum interference device (SQUID) magnetometer. The HCl-leaching experiments together with TEM micrographs and nitrogen sorption analysis suggested that most of the gamma-Fe(2)O(3) domains of several nanometers were embedded in the silica walls, rather than dispersed in the mesopores, which could cause the significant pore clogging reported in some studies. The release behaviors of lysozyme from these magnetic porous nanocomposites were investigated for the possible application of drug targeting and control release. The influence of iron precursors was also studied and a possible mechanism was proposed. The hydrolysis of Fe(3+) ions under weakly acidic conditions and the induced formation of Si-O-Fe bonds may account for the synthesis of this kind of nanocomposite. These multifunctional nanostructured materials would have a wide range of applications in toxin removal, catalysis, waste remediation, and biological separation as well as novel drug-carrier technologies.
Publisher: American Chemical Society (ACS)
Date: 02-03-2016
Publisher: Wiley
Date: 19-07-2019
Publisher: Elsevier BV
Date: 06-2011
Publisher: Springer Science and Business Media LLC
Date: 09-06-2016
DOI: 10.1038/SREP27760
Abstract: Primary evidence of the direct uptake of atmospheric CO 2 and direct transformation into carbon nanotubes, CNTs, is demonstrated through isotopic labeling and provides a new high yield route to mitigate this greenhouse gas. CO 2 is converted directly to CNTs and does not require pre-concentration of the airbone CO 2 . This C2CNT (CO 2 to carbon nanotube) synthesis transforms CO 2-gas dissolved in a 750 °C molten Li 2 CO 3 , by electrolysis, into O 2-gas at a nickel electrode and at a steel cathode into CNTs or carbon or nanofibers, CNFs. CNTs are synthesized at a 100-fold price reduction compared to conventional chemical vapour deposition, CVD, synthesis. The low cost conversion to a stable, value-added commodity incentivizes CO 2 removal to mitigate climate change. The synthesis allows morphology control at the liquid/solid interface that is not available through conventional CVD synthesis at the gas/solid interface. Natural abundance 12 CO 2 forms hollow CNTs, while equivalent synthetic conditions with heavier 13 CO 2 favours closed core CNFs, as characterized by Raman, SEM and TEM. Production ease is demonstrated by the first synthesis of a pure 13 C multiwalled carbon nanofiber.
Publisher: Wiley
Date: 13-08-2015
Abstract: An ionothermal sol-gel strategy to synthesize hierarchically porous carbon aerogels doped with different heteroatoms is presented by using biomass precursors in a scalable process. Morphologically similar but chemically different materials are used to study the influence of heteroatoms in Li-S batteries. The materials show capacities as high as 1290 mAh g(-1) in the first cycle using 50 wt % S loading. Heteroatom doping reduces the capacity fading and the polarization throughout cycling. Zeta potential measurements reveal positive surface charges for heteroatom-doped carbons and indicate attractive interactions with polysulfides causing reduced fading. A polysulfide-selective sorption study reveals strongly different adsorption behavior depending on the carbon's chemical composition. Interestingly, the polysulfide fraction is also crucial. The results indicate that improved adsorption of long-chain polysulfides to doped carbons is related to improved capacity retention.
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 06-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CC05775D
Abstract: A new strategy was developed for the direct conversion of furfural to 1,5-pentanediol by the hydrogenolysis of the furan ring under mild conditions based on Pt/Co(2)AlO(4) catalyst. This is the first report of the direct catalytic conversion of furfural to 1,5-pentanediol with high yield.
Publisher: American Chemical Society (ACS)
Date: 25-05-2000
DOI: 10.1021/CM0000853
Publisher: Elsevier BV
Date: 05-2011
Publisher: Elsevier BV
Date: 05-2005
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA01836B
Abstract: A new type of sulfonated carbon material with hiphilic properties was synthesized by the hydrothermal carbonization of a mixture of furfural–sodium dodecylbenzene sulfonate at 180 °C in an autoclave.
Publisher: Elsevier BV
Date: 03-2017
Publisher: Wiley
Date: 28-01-2013
DOI: 10.1002/AIC.14019
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B314224H
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1GC15306D
Publisher: Elsevier BV
Date: 06-2011
Publisher: Springer Science and Business Media LLC
Date: 02-04-2021
DOI: 10.1007/S13738-021-02220-0
Abstract: A novel sulfated-group-riched sulfonated carbonaceous catalyst with high acidic strength and adjustable ratio of acidic groups was designed in the paper, where glucose and benzyl chloride were hydrothermally carbonized first followed by sulfonation treatment. Various physicochemical techniques were used to characterize the catalyst such as IR, 13C MAS NMR and XPS spectra, NH3-TPD, XRD patterns and TG curve. Then, it was applied in the esterification of succinic acid and fructose dehydration to form HMF. Compared to commercial Amberlyst-15 catalyst, such carbonaceous solid acid exhibited excellent catalytic activity and thermal stability, which was attributed to its higher amount of sulfonic acid group.
Publisher: American Chemical Society (ACS)
Date: 02-10-2015
Publisher: Springer Science and Business Media LLC
Date: 02-2010
Publisher: Wiley
Date: 06-12-2014
Publisher: American Chemical Society (ACS)
Date: 09-09-2008
DOI: 10.1021/JP8048394
Publisher: Elsevier BV
Date: 03-2014
Publisher: Elsevier BV
Date: 10-2017
Publisher: American Chemical Society (ACS)
Date: 17-02-2016
Abstract: Nickel(II) sulfide (NiS) nanosheets with a thickness of 10 nm and a size of 200 nm were facilely grown on stainless steel (SLS) meshes via a one-pot hydrothermal method. This unique construction renders an excellent electrical contact between the porous film of active NiS sheets and the highly conductive substrate, which exhibits a superior catalytic activity toward oxygen evolution reaction (OER). The NiS@SLS electrocatalyst exhibits an unusually low overpotential of 297 mV (i.e., 1.524 V vs RHE) at a current density of 11 mA·cm(-2), and an extra small Tafel slope of only 47 mV·dec(-1) proves an even more competitive performance at high to very high current densities. This performance compares very favorably to other Ni-based catalysts and even to the precious state-of-the-art IrO2 or RuO2 catalyst.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10274E
Abstract: The electromagnetic and microwave absorbing properties of nickel ferrite nanocrystals were investigated for the first time. There were two frequencies corresponding to the maximum reflection loss in a wide thickness range from 3.0 to 5.0 mm, which may be bought by the nanosize effect and the good crystallization of the nanocrystals.
Publisher: Informa UK Limited
Date: 03-2006
Publisher: American Scientific Publishers
Date: 09-2020
Abstract: Two Australian native wooden sources (Acacia Mangium and Eucalyptus Globulus) derived pulps were explored as raw feed stocks to prepare the valuable nanomaterial of cellulose nanocrystals (CNC). After bleaching and acid hydrolysis, cellulose nanocrystals were successfully produced with high yields of approximately 60% for both kraft pulps. According to the characterization of SEM and AFM, the as prepared CNC had a rod like structure with the length and diameter in the range of 200~1000 nm and 10~100 nm, respectively based on the initial wooden source. XRD confirmed the crystalline structure of the resulting CNC. Further characterisation by TGA showed that the chemical treatment of the wood pulp had impact upon the thermal stability, evidenced by a lower onset temperature of the thermal decomposition of CNC.
Publisher: Elsevier BV
Date: 02-2010
Publisher: Wiley
Date: 20-10-2020
Abstract: The massive release of the greenhouse gas CO 2 has resulted in numerous environmental issues. In searching for advanced technologies for CO 2 capture/conversions, recent advances in electrochemical reduction of CO 2 in molten salts shed a light on potential solutions to CO 2 mitigation. Electro‐reduction of CO 2 in molten salts exhibits features like high selectivity and efficiency towards sustainable carbons and fuels, low toxicity, and possibility to combine with in situ CO 2 capture. In this Minireview, we highlight the tuning of the products in this process and mainly discuss two categories of electrolyte, carbonate‐based molten salts (CMS) and those based on halides (HMS). Depending on the synthetic conditions, fuels such as CO or hydrocarbons (in the presence of hydrogen source, i. e., LiOH, NaOH, or KOH in the electrolyte) as well as high‐value nanostructured carbons including carbon nanotubes, carbon nanofibers, carbon nano‐onions, and graphene can be obtained with high efficiency. The synthesis parameters are compared, and the applications of as‐obtained carbons are briefly summarized. Additionally, some perspectives on this technology are also discussed.
Publisher: Wiley
Date: 09-01-2015
Publisher: Springer Science and Business Media LLC
Date: 25-11-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM01973A
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CY20204B
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA03460H
Abstract: This is a Density Functional Theory (DFT) study on the influence of an alloying mixture of Ni–Zn catalysts on carbon nanotube, CNT, growth.
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 03-2010
Publisher: American Chemical Society (ACS)
Date: 07-11-2019
DOI: 10.1021/ACS.ACCOUNTS.9B00405
Abstract: Climate change represents one of the most important environmental issues of our time. Due to high levels of anthropogenic CO
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 09-2012
Publisher: Wiley
Date: 03-03-2010
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 03-2012
Publisher: Springer Science and Business Media LLC
Date: 12-2009
Publisher: Elsevier BV
Date: 05-2011
Publisher: Springer Science and Business Media LLC
Date: 07-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2GC35699F
Publisher: Springer Science and Business Media LLC
Date: 06-2005
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 06-2009
Publisher: American Chemical Society (ACS)
Date: 05-08-2015
DOI: 10.1021/ACS.NANOLETT.5B02427
Abstract: Carbon nanofibers, CNFs, due to their superior strength, conductivity, flexibility, and durability have great potential as a material resource but still have limited use due to the cost intensive complexities of their synthesis. Herein, we report the high-yield and scalable electrolytic conversion of atmospheric CO2 dissolved in molten carbonates into CNFs. It is demonstrated that the conversion of CO2 → CCNF + O2 can be driven by efficient solar, as well as conventional, energy at inexpensive steel or nickel electrodes. The structure is tuned by controlling the electrolysis conditions, such as the addition of trace transition metals to act as CNF nucleation sites, the addition of zinc as an initiator and the control of current density. A less expensive source of CNFs will facilitate its adoption as a societal resource, and using carbon dioxide as a reactant to generate a value added product such as CNFs provides impetus to consume this greenhouse gas to mitigate climate change.
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 03-2010
Publisher: Wiley
Date: 26-07-2021
Abstract: Methods for the fabrication of thin films with well controlled structure and properties are of great importance for the development of functional devices for a large range of applications. SILAR, the acronym for Successive Ionic Layer Adsorption and Reaction, is an evolution and combination of two other deposition methods, the Atomic Layer Deposition and Chemical Bath Deposition. Due to a relative simplicity and low cost, this method has gained increasing interest in the scientific community. There are, however, several aspects related to the influence of the many parameters involved, which deserve further deepening. In this review article, the basis of the method, its application to the fabrication of thin films, the importance of experimental parameters, and some recent advances in the application of oxide films are reviewed. At first the fundamental theoretical bases and experimental concepts of SILAR are discussed. Then, the fabrication of chalcogenides and metal oxides is reviewed, with special emphasis to metal oxides, trying to extract general information on the effect of experimental parameters on structural, morphological and functional properties. Finally, recent advances in the application of oxide films prepared by SILAR are described, focusing on supercapacitors, transparent electrodes, solar cells, and photoelectrochemical devices.
No related grants have been discovered for JIAWEN REN.