ORCID Profile
0000-0002-0915-0756
Current Organisations
UNSW Sydney
,
University of Adelaide
,
Monash University
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Publisher: The Electrochemical Society
Date: 2017
DOI: 10.1149/2.0071714JES
Publisher: American Chemical Society (ACS)
Date: 04-01-2021
Publisher: AIP Publishing
Date: 09-2023
DOI: 10.1063/5.0153029
Publisher: Emerald
Date: 07-04-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2TA08306J
Abstract: Relationship between d-metal active species (Co, Ni, & Cu) in Prussian blue analogue derived metal oxide/hydroxide films and the activation energy needed for full conversion of 5-HMF to 2,5-FDCA in alkaline solution.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA00071K
Abstract: Ruthenium containing molecular electrocatalyst onto pyridine modified, fluorine-doped carbon cloth represents an efficient, bifunctional, and regenerable electrode for water electrolysis at pH 7.
Publisher: Elsevier BV
Date: 10-2023
Publisher: Wiley
Date: 20-10-2023
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 12-2016
Publisher: American Chemical Society (ACS)
Date: 18-11-2016
Publisher: Wiley
Date: 10-09-2023
Publisher: American Chemical Society (ACS)
Date: 02-02-2023
Publisher: Springer Science and Business Media LLC
Date: 05-03-2018
Publisher: Wiley
Date: 12-01-2023
Abstract: Establishing generic catalyst design principles by identifying structural features of materials that influence their performance will advance the rational engineering of new catalytic materials. In this study, by investigating metal‐substituted manganese oxide (spinel) nanoparticles, Mn 3 O 4 :M (M=Sr, Ca, Mg, Zn, Cu), we rationalize the dependence of the activity of Mn 3 O 4 :M for the electrocatalytic oxygen reduction reaction (ORR) on the enthalpy of formation of the binary MO oxide, Δ f H°(MO), and the Lewis acidity of the M 2+ substituent. Incorporation of elements M with low Δ f H°(MO) enhances the oxygen binding strength in Mn 3 O 4 :M, which affects its activity in ORR due to the established correlation between ORR activity and the binding energy of *O/*OH/*OOH species. Our work provides a perspective on the design of new compositions for oxygen electrocatalysis relying on the rational substitution/doping by redox‐inactive elements.
Publisher: Springer Science and Business Media LLC
Date: 28-11-2022
Publisher: Wiley
Date: 08-07-2022
Abstract: Closing both the carbon and nitrogen loops is a critical venture to support the establishment of the circular, net‐zero carbon economy. Although single atom catalysts (SACs) have gained interest for the electrochemical reduction reactions of both carbon dioxide (CO 2 RR) and nitrate (NO 3 RR), the structure–activity relationship for Cu SAC coordination for these reactions remains unclear and should be explored such that a fundamental understanding is developed. To this end, the role of the Cu coordination structure is investigated in dictating the activity and selectivity for the CO 2 RR and NO 3 RR. In agreement with the density functional theory calculations, it is revealed that Cu‐N 4 sites exhibit higher intrinsic activity toward the CO 2 RR, whilst both Cu‐N 4 and Cu‐N 4− x ‐C x sites are active toward the NO 3 RR. Leveraging these findings, CO 2 RR and NO 3 RR are coupled for the formation of urea on Cu SACs, revealing the importance of *COOH binding as a critical parameter determining the catalytic activity for urea production. To the best of the authors’ knowledge, this is the first report employing SACs for electrochemical urea synthesis from CO 2 RR and NO 3 RR, which achieves a Faradaic efficiency of 28% for urea production with a current density of − 27 mA cm –2 at − 0.9 V versus the reversible hydrogen electrode.
Publisher: Wiley
Date: 12-10-2023
Publisher: Wiley
Date: 17-10-2022
Abstract: H 2 evolution is the reason for poor reversibility and limited cycle stability with Zn‐metal anodes, and impedes practical application in aqueous zinc‐ion batteries (AZIBs). Here, using a combined gas chromatography experiment and computation, it is demonstrated that H 2 evolution primarily originates from solvated water, rather than free water without interaction with Zn 2+ . Using linear sweep voltammetry (LSV) in salt electrolytes, H 2 evolution is evidenced to occur at a more negative potential than zinc reduction because of the high overpotential against H 2 evolution on Zn metal. The hypothesis is tested and, using a glycine additive to reduce solvated water, it is confirmed that H 2 evolution and “parasitic” side reactions are suppressed on the Zn anode. This electrolyte additive is evidenced to suppress H 2 evolution, reduce corrosion, and give a uniform Zn deposition in Zn|Zn and Zn|Cu cells. It is demonstrated that Zn|PANI (highly conductive polyaniline) full cells exhibit boosted electrochemical performance in 1 M ZnSO 4 –3 M glycine electrolyte. It is concluded that this new understanding of electrochemistry of H 2 evolution can be used for design of relatively low‐cost and safe AZIBs for practical large‐scale energy storage.
Publisher: American Chemical Society (ACS)
Date: 02-12-2019
DOI: 10.1021/ACS.JPCLETT.9B03023
Abstract: Magnesium halide salts are an exciting prospect as stable and high-performance electrolytes for rechargeable Mg batteries (RMBs). By nature of their complex equilibria, these salts exist in solution as a variety of electroactive species (EAS) in equilibrium with counterions such as AlCl
Publisher: American Chemical Society (ACS)
Date: 09-02-2022
Publisher: Elsevier BV
Date: 07-2020
Publisher: American Chemical Society (ACS)
Date: 24-03-2023
Publisher: Monash University
Date: 2019
Publisher: American Chemical Society (ACS)
Date: 11-12-2019
Abstract: Magnesium (Mg) metal has been widely explored as an anode material for Mg-ion batteries (MIBs) owing to its large specific capacity and dendrite-free operation. However, critical challenges, such as the formation of passivation layers during battery operation and anode-electrolyte-cathode incompatibilities, limit the practical application of Mg-metal anodes for MIBs. Motivated by the promise of group XIV elements (namely, Si, Ge, and Sn) as anodes for lithium- and sodium-ion batteries, here, we conduct systematic first-principles calculations to explore the thermodynamics and kinetics of group XIV anodes for MIBs and to identify the atomistic mechanisms of the electrochemical insertion reactions of Mg ions. We confirm the formation of amorphous Mg
Publisher: Wiley
Date: 03-2018
Abstract: A semiconductor p-n junction typically has a doping-induced carrier depletion region, where the doping level positively correlates with the built-in potential and negatively correlates with the depletion layer width. In conventional bulk and atomically thin junctions, this correlation challenges the synergy of the internal field and its spatial extent in carrier generation/transport. Organic-inorganic hybrid perovskites, a class of crystalline ionic semiconductors, are promising alternatives because of their direct badgap, long diffusion length, and large dielectric constant. Here, strong depletion in a lateral p-n junction induced by local electronic doping at the surface of in idual CH
Publisher: AIP Publishing
Date: 24-04-2023
DOI: 10.1063/5.0140107
Abstract: Aqueous alkali and multivalent metal-ion batteries are practically advantageous for large-scale energy storage because of intrinsic safety and environmental friendliness. Drawbacks, however, include low energy density and short life because of limited electrochemical stability windows (ESWs) of aqueous electrolytes and rapid degradation of electrode materials with high water activity. Despite significant research, including water-in-salt and electrolyte additive(s), directed to the electrolyte to extend ESWs and to boost electrode stability, the practical application remains limited because of the present high cost and generally unsatisfactory performance. Although alkali and multivalent metal ions can have different coordinating structures with solvents and anions, electrolyte design strategies share fundamental mechanisms in either extending ESWs or achieving a passivation layer on the electrode material(s). Future development of aqueous batteries, therefore, is dependent on a systematic understanding and analysis of electrolyte research. Here, we report for the first time a systematic review of the design and engineering of emerging water-based electrolytes for boosted aqueous rechargeable batteries (ARBs) performance. We present a comparative summary of electrochemical stability windows and electrode/electrolyte interphases for five (5) electrolyte types appraise strategies and the resulting impact of electrolyte properties on electrode interfacial stability analyze in situ generated electrode/electrolyte interphases classify advantages and drawbacks of selected strategies and provide a perspective on future developments in aqueous alkali and multivalent metal-ion batteries, together with methods for the study of both electrolyte and derived interphase(s). We conclude that (1) the design of electrolytes of high concentration and hybrid and eutectic solvents are practically promising for high energy density ARBs (2) there is a need to improve design for longer cycling life of ARBs (3) research addresses boosting ESW of the electrolyte and (4) it increased the understanding of the electrode/electrolyte interface stability via new electrode/electrolyte interphase structures. This review will be of benefit in the practical design of electrolyte(s) for aqueous batteries for high performance and, therefore, of interest to researchers and manufacturers.
Publisher: Springer Science and Business Media LLC
Date: 11-05-2023
DOI: 10.1038/S41467-023-38384-X
Abstract: Aqueous Zn-ion batteries have attracted increasing research interest however, the development of these batteries has been hindered by several challenges, including dendrite growth, Zn corrosion, cathode material degradation, limited temperature adaptability and electrochemical stability window, which are associated with water activity and the solvation structure of electrolytes. Here we report that water activity is suppressed by increasing the electron density of the water protons through interactions with highly polar dimethylacetamide and trimethyl phosphate molecules. Meanwhile, the Zn corrosion in the hybrid electrolyte is mitigated, and the electrochemical stability window and the operating temperature of the electrolyte are extended. The dimethylacetamide alters the surface energy of Zn, guiding the (002) plane dominated deposition of Zn. Molecular dynamics simulation evidences Zn 2+ ions are solvated with fewer water molecules, resulting in lower lattice strain in the NaV 3 O 8 ·1.5H 2 O cathode during the insertion of hydrated Zn 2+ ions, boosting the lifespan of Zn|| NaV 3 O 8 ·1.5H 2 O cell to 3000 cycles.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE01453C
Publisher: Wiley
Date: 20-02-2023
Abstract: Room‐temperature detection of volatile organic compounds in particle‐per‐billion concentrations is critical for the development of wearable and distributed sensor networks. However, sensitivity and selectivity are limited at low operating temperatures. Here, a strategy is proposed to substantially improve the performance of semiconductor sensors. Tunable oxygen vacancies in thick 3D networks of metal oxide nanoparticles are engineered using deep ultraviolet photoactivation. High selectivity and sensitivity are achieved by optimizing the electronic structure and surface activity while preserving the 3D morphology. Cross‐sectional depth analysis reveals oxygen vacancies present at various depths (≈24% at a depth of 1.13 µm), with a uniform distribution throughout the thick films. This results in ≈58% increase in the sensitivity of ZnO to 20‐ppb ethanol at room temperature while ≈51% and 64% decrease in the response and recovery times, respectively. At an operating temperature of 150 °C, oxygen‐vacant nanostructures achieve a lower limit of detection of 2 ppb. Density functional theory analysis shows that inducing oxygen vacancies reduces activation energy for ethanol adsorption and dissociation, leading to improved sensing performance. This scalable approach has the potential for designing low‐power wearable chemical and bio‐sensors and tuning the activity and band structure of porous, thick oxide films for multiple applications.
Publisher: Springer Science and Business Media LLC
Date: 16-10-2023
Publisher: Wiley
Date: 17-04-2023
Abstract: Aqueous Zn‐Iodine (I 2 ) batteries are attractive for large‐scale energy storage. However, drawbacks include, Zn dendrites, hydrogen evolution reaction (HER), corrosion and, cathode “shuttle” of polyiodines. Here we report a class of N‐containing heterocyclic compounds as organic pH buffers to obviate these. We evidence that addition of pyridine /imidazole regulates electrolyte pH, and inhibits HER and anode corrosion. In addition, pyridine and imidazole preferentially absorb on Zn metal, regulating non‐dendritic Zn plating /stripping, and achieving a high Coulombic efficiency of 99.6 % and long‐term cycling stability of 3200 h at 2 mA cm −2 , 2 mAh cm −2 . It is also confirmed that pyridine inhibits polyiodines shuttling and boosts conversion kinetics for I − /I 2 . As a result, the Zn‐I 2 full battery exhibits long cycle stability of 000 cycles and high specific capacity of 105.5 mAh g −1 at 10 A g −1 . We conclude organic pH buffer engineering is practical for dendrite‐free and shuttle‐free Zn‐I 2 batteries.
Publisher: Elsevier BV
Date: 07-2019
Publisher: American Chemical Society (ACS)
Date: 12-2022
Publisher: Elsevier BV
Date: 04-2015
Publisher: American Chemical Society (ACS)
Date: 23-01-2020
No related grants have been discovered for Jodie A. Yuwono.