ORCID Profile
0000-0002-3027-0816
Current Organisation
Australian Nuclear Science and Technology Organisation
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Physical chemistry not elsewhere classified | Chemical engineering | Nanotechnology | Nanotechnology | Functional materials | Condensed Matter Physics—Structural Properties | Electrochemical energy storage and conversion | Condensed Matter Physics—Other
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0GC03999C
Abstract: Furfural can be electrochemically hydrogenated to 2-methylfuran in mild conditions with high selectivity using a catalyst containing single atom copper active sites and oxophilic phosphorus dopants.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7DT04374K
Abstract: The structural stability and evolution of Sc 2 (WO 4 ) 3 with temperature is altered when discharged versus Na in a half cell battery resulting in formation of novel crystalline phases.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-09-2023
Publisher: Elsevier BV
Date: 09-2021
Publisher: Wiley
Date: 16-02-2017
Abstract: [Rh III (*Cp)Cl(X,Y)] n + complexes {X, Y = Cl, PTA, n = 0 ( 2 ) X, Y = en, n = 1 ( 3 , Cl – salt 4 , PF 6 – salt) X, Y = acac, n = 0 ( 5 ) X, Y = cur, n = 0 ( 6 ), where *Cp = pentamethylcyclopentadienato, curH = curcumin PTA = 1,3,5‐triaza‐7‐phosphatricyclo[3.3.1.1]decane en = 1,2‐ethanediamine acac = acetylacetonato = 2,4‐pentanedionato(1–)} were synthesized from [Rh(*Cp)(µ‐Cl)Cl] 2 ( 1 ). While 2 – 5 were inactive against human epithelial A549 lung‐cancer cells in assays of cytotoxicity, and antimetastatic and proapoptotic behaviors, 6 had a cytotoxic activity similar to that of curH over 72 h, but at 24 h in real‐time cell migration assays, it was less active, showing slow release of curH. All complexes underwent ligand‐exchange reactions with biomolecules and cells within the timeframes of the assays (X‐ray absorption spectroscopy). Intracellular elemental distributions (X‐ray fluorescence microscopy) showed that 6 effectively delivered curH to cells, where it was released. Other elemental distributions and caspase activities were consistent with preapoptotic activities. As such, 6 is a promising delivery agent for bioactive ligands, such as curH. However, pure curcumin itself showed a previously unrecognized ability to promote migration of A549 cells at subtoxic concentrations in the presence of endothelial growth factor, which may be a concern for its widespread use as a nutritional supplement and as a potential drug. This aspect warrants further research.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3CP02030D
Abstract: Batteries play an increasingly critical role in the functioning of contemporary society. This work illustrates a new family of electrode materials and an alternative method to produce the electrode for applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC02816A
Abstract: A sodium-rich vanadium compound, Na 4 V 2 O 7 , is investigated as a cathode material for sodium-ion batteries, with a high reversible capacity of 194 mA h g −1 after activating to 4.7 V.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EY00046J
Abstract: Modification of the manganese–antimony oxide nanocomposites with lead produces an active and highly robust electrocatalyst for anodes of hydrogen-generating water electrolysers with proton conducting electrolytes.
Publisher: Elsevier BV
Date: 2016
Publisher: Wiley
Date: 21-04-2021
Abstract: Taking advantage of a high‐flux light source, synchrotron X‐ray absorption spectroscopy (XAS) beamline is able to perform in situ/ex situ , element‐selective, and qualitative/quantitative experiments to elucidate electrochemical reaction mechanisms of batteries accurately and efficiently. In situ synchrotron XAS probes dynamic electronic and local atomic structure information, including valence state, charge transfer, local geometry and symmetry, bond number/length/type and disorder degree, of target elements of significance during battery operation, which facilitates to promote the development of rechargeable batteries by building accurate structure‐performance relationships fundamentally. In this review, the basic principles for XAS are briefly introduced, design strategies for in situ XAS experiments are proposed, salient in situ XAS studies of battery anodes are summarized, and current challenges and future opportunities based on XAS measurements are also outlined.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 14-09-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3MA00286A
Abstract: Holistic investigations into the various mechanisms of battery electrodes are essential for the development of competitive and sustainable novel battery materials.
Publisher: Elsevier BV
Date: 2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CE01707C
Abstract: Al 2 W 3−x Mo x O 12 shows an orthorhombic to monoclinic transition with increasing Mo concentration and ∼100 mA h g −1 capacity at 100 cycles in Li-cells.
Publisher: Springer Science and Business Media LLC
Date: 02-01-2023
Publisher: Wiley
Date: 21-10-2021
Abstract: Aqueous Zn‐ion batteries (ZIBs) are regarded as alternatives to Li‐ion batteries benefiting from both improved safety and environmental impact. The widespread application of ZIBs, however, is compromised by the lack of high‐performance cathodes. Currently, only the intercalation mechanism is widely reported in aqueous ZIBs, which significantly limits cathode options. Beyond Zn‐ion intercalation, we comprehensively study the conversion mechanism for Zn 2+ storage and its diffusion pathway in a CuI cathode, indicating that CuI occurs a direct conversion reaction without Zn 2+ intercalation due to the high energy barrier for Zn 2+ intercalation and migration. Importantly, this direct conversion reaction mechanism can be readily generalized to other high‐capacity cathodes, such as Cu 2 S (336.7 mA h g −1 ) and Cu 2 O (374.5 mA h g −1 ), indicating its practical universality. Our work enriches the Zn‐ion storage mechanism and significantly broadens the cathode horizons towards next‐generation ZIBs.
Publisher: Wiley
Date: 26-04-2022
Abstract: Aiming to design a catalyst for stable electrooxidation of water at low pH, the present work explores the properties and structural features of electrodeposited composite oxides based on Bi and Co, which were anticipated to provide stability and catalytical activity, respectively. Materials deposited as very thin ( ca 50 nm) films on F‐doped SnO 2 (FTO) substrate do not initially exhibit high activity in 0.1 M H 2 SO 4 , but are activated during operation through the electrooxidatively‐induced enrichment of the catalytic surface with Co and Sn oxides. The latter originate from the FTO support and are identified as an important component of the catalyst through control experiments with a Sn‐free substrate and with Sn 2+ intentionally added at the electrodeposition stage. A distinctive feature of the Co−Bi−Sn‐based electrocatalyst is the slow but persistent improvement in the activity during operation in 0.1 M H 2 SO 4 at both ambient and elevated (60 °C) temperatures, which contrasts with the continuously degrading behaviour of state‐of‐the‐art oxygen evolution catalysts at low pH. This is demonstrated by 9‐day‐long galvanostatic tests at 10 mA cm −2 , during which the Co−Bi−Sn‐based thin film catalyst shows no degradation and sustains stable water oxidation at ca 1.9 V vs . reversible hydrogen electrode. The effects of tin leaching from the support detected herein might have implications to other acidic water oxidation catalysts supported on high‐surface area doped SnO 2 materials.
Publisher: Wiley
Date: 20-10-2021
Abstract: Aqueous Zn‐ion batteries (ZIBs) are regarded as alternatives to Li‐ion batteries benefiting from both improved safety and environmental impact. The widespread application of ZIBs, however, is compromised by the lack of high‐performance cathodes. Currently, only the intercalation mechanism is widely reported in aqueous ZIBs, which significantly limits cathode options. Beyond Zn‐ion intercalation, we comprehensively study the conversion mechanism for Zn 2+ storage and its diffusion pathway in a CuI cathode, indicating that CuI occurs a direct conversion reaction without Zn 2+ intercalation due to the high energy barrier for Zn 2+ intercalation and migration. Importantly, this direct conversion reaction mechanism can be readily generalized to other high‐capacity cathodes, such as Cu 2 S (336.7 mA h g −1 ) and Cu 2 O (374.5 mA h g −1 ), indicating its practical universality. Our work enriches the Zn‐ion storage mechanism and significantly broadens the cathode horizons towards next‐generation ZIBs.
Publisher: MDPI AG
Date: 28-04-2023
DOI: 10.3390/INORGANICS11050191
Abstract: The structural determination of ultrasmall clusters remains a challenge due to difficulties in crystallisation. Often the atomically precise clusters undergo structural change under the influence of the environment. X-ray absorption spectroscopy (XAS) can be an attractive tool to study the electronic and geometric properties of such clusters deposited onto various supports under in situ conditions. Herein, [Au6(dppp)4](NO3)2, [Au9(PPh3)8](NO3)3, [Au13(dppe)5Cl2]Cl3, and Au101(PPPh3)21Cl5 clusters were studied using XAS. The clusters exhibited distinct features compared to bulk gold. XANES results show a systematic increase in the absorption edge energy and white line intensity, with a decrease in cluster nuclearity. The EXAFS of clusters are sensitive to nuclearity and ligands and were fitted with their known crystal structures. This study advances the understanding of the phosphine-ligated metal clusters relevant to practical applications in catalysis and sensing.
Publisher: Springer Science and Business Media LLC
Date: 13-05-2019
Publisher: Elsevier BV
Date: 04-2023
Publisher: American Astronomical Society
Date: 03-2022
Abstract: Very long baseline interferometric (VLBI) localizations of repeating fast radio bursts (FRBs) have demonstrated a ersity of local environments: from nearby star-forming regions to globular clusters. Here we report the VLBI localization of FRB 20201124A using an ad hoc array of dishes that also participate in the European VLBI Network (EVN). In our c aign, we detected 18 bursts from FRB 20201124A at two separate epochs. By combining the visibilities from both epochs, we were able to localize FRB 20201124A with a 1 σ uncertainty of 2.7 mas. We use the relatively large burst s le to investigate astrometric accuracy and find that for ≳20 baselines (≳7 dishes) we can robustly reach milliarcsecond precision even using single-burst data sets. Subarcsecond precision is still possible for single bursts, even when only ∼6 baselines (four dishes) are available. In such cases, the limited uv coverage for in idual bursts results in very high side-lobe levels. Thus, in addition to the peak position from the dirty map, we also explore smoothing the structure in the dirty map by fitting Gaussian functions to the fringe pattern in order to constrain in idual burst positions, which we find to be more reliable. Our VLBI work places FRB 20201124A 710 ± 30 mas (1 σ uncertainty) from the optical center of the host galaxy, consistent with originating from within the recently discovered extended radio structure associated with star formation in the host galaxy. Future high-resolution optical observations, e.g., with Hubble Space Telescope, can determine the proximity of FRB 20201124A’s position to nearby knots of star formation.
Publisher: Wiley
Date: 24-09-2020
Publisher: Springer Science and Business Media LLC
Date: 23-01-2023
DOI: 10.1038/S41467-023-36078-Y
Abstract: Selective two-electron (2e − ) oxygen reduction reaction (ORR) offers great opportunities for hydrogen peroxide (H 2 O 2 ) electrosynthesis and its widespread employment depends on identifying cost-effective catalysts with high activity and selectivity. Main-group metal and nitrogen coordinated carbons (M-N-Cs) are promising but remain largely underexplored due to the low metal-atom density and the lack of understanding in the structure-property correlation. Here, we report using a nanoarchitectured Sb 2 S 3 template to synthesize high-density (10.32 wt%) antimony (Sb) single atoms on nitrogen- and sulfur-codoped carbon nanofibers (Sb-NSCF), which exhibits both high selectivity (97.2%) and mass activity (114.9 A g −1 at 0.65 V) toward the 2e − ORR in alkaline electrolyte. Further, when evaluated with a practical flow cell, Sb-NSCF shows a high production rate of 7.46 mol g catalyst −1 h −1 with negligible loss in activity and selectivity in a 75-h continuous electrolysis. Density functional theory calculations demonstrate that the coordination configuration and the S dopants synergistically contribute to the enhanced 2e − ORR activity and selectivity of the Sb-N 4 moieties.
Location: Australia
Start Date: 2023
End Date: 12-2025
Amount: $398,530.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2008
End Date: 12-2012
Amount: $300,000.00
Funder: Australian Research Council
View Funded Activity