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• W3201043721 abstract "Essential photoelectrochemical (PEC) functionalities are systematically analyzed on a series of copper vanadate photoanodes with different Cu:V elemental ratios. Homogeneous, highly continuous, and phase-pure thin films of <i>β</i>-Cu₂V₂O₇, <i>γ</i>-Cu₃V₂O₈, Cu₁₁V₆O₂₆ and Cu₅V₂O₁₀ are grown via reactive co-sputtering deposition and then evaluated for their performances in light-driven oxygen evolution reaction (OER). Despite all four compounds have similar 1.8 – 2.0 eV bandgaps, Cu-rich phases are found to exhibit shorted absorption length in addition to higher charge separation efficiencies at the semiconductor/electrolyte junction. In the presence of sacrificial hole acceptor, the superior bulk properties of Cu₅V₂O₁₀ photoanode translate to the most cathodic (0.67 V vs. RHE) onset potential and a 206 μA/cm² photocurrent density that is four times higher than <i>β</i>-Cu₂V₂O₇ at 1.23 V. vs. RHE. Nevertheless, the sluggish OER kinetics competes with carrier recombination through Cu-associated surface states, and transient photocurrent spectroscopy quantitatively reveals the deterioration of surface catalytic activity with increasing Cu:V elemental ratio. This comprehensive analysis of PEC characteristics – light absorption, carrier separation, and heterogeneous charge transfer – not only gives insights into functional roles of individual elements in ternary metal oxide photoanodes, but also provides strategies for rational discovery, design, and engineering of new photoelectrode materials for solar fuel production." @default.
• W3201043721 created "2021-09-27" @default.
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• W3201043721 date "2017-01-01" @default.
• W3201043721 modified "2023-09-27" @default.
• W3201043721 title "Understanding Energy Conversion and Loss Mechanisms in Ternary Metal Oxide Photoelectrodes: The Case of Copper Vanadate" @default.
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• W3201043721 doi "https://doi.org/10.26434/chemrxiv.5514871.v1" @default.
• W3201043721 hasPublicationYear "2017" @default.
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