Composition-Dependent Functionality of Copper Vanadate Photoanodes

Chang Ming Jiang; Gideon Segev; Lucas H. Hess; Guiji Liu; Gregory Zaborski; Francesca M. Toma; Jason K. Cooper; Ian D. Sharp

doi:10.1021/acsami.8b02977

Composition-Dependent Functionality of Copper Vanadate Photoanodes

Chang Ming Jiang, Gideon Segev, Lucas H. Hess, Guiji Liu, Gregory Zaborski, Francesca M. Toma, Jason K. Cooper, Ian D. Sharp^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

To understand functional roles of constituent elements in ternary metal oxide photoanodes, essential photoelectrochemical (PEC) properties are systematically analyzed on a series of copper vanadate compounds with different Cu:V elemental ratios. Homogeneous and highly continuous thin films of β-Cu₂V₂O₇, γ-Cu₃V₂O₈, Cu₁₁V₆O₂₆, and Cu₅V₂O₁₀ are grown via reactive co-sputtering and their performance characteristics for the light-driven oxygen evolution reaction are evaluated. All four compounds have similar bandgaps in the range of 1.83-2.03 eV, though Cu-rich phases exhibit stronger optical absorption and higher charge separation efficiencies. Transient photocurrent analysis reveals a reduction of surface catalytic activity with increasing Cu:V elemental ratio due to competitive charge recombination at Cu-related surface states. This comprehensive analysis of PEC functionalities - including photon absorption, carrier separation, and heterogeneous charge transfer - informs strategies for improving PEC activity in the copper vanadate materials system and provides insights that may aid discovery, design, and engineering of new photoelectrode materials.

Original language	English
Pages (from-to)	10627-10633
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	13
DOIs	https://doi.org/10.1021/acsami.8b02977
State	Published - 4 Apr 2018
Externally published	Yes

Keywords

copper vanadate
photoanode
photoelectrochemistry
surface states
transient photocurrent analysis
water oxidation

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10.1021/acsami.8b02977

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title = "Composition-Dependent Functionality of Copper Vanadate Photoanodes",

abstract = "To understand functional roles of constituent elements in ternary metal oxide photoanodes, essential photoelectrochemical (PEC) properties are systematically analyzed on a series of copper vanadate compounds with different Cu:V elemental ratios. Homogeneous and highly continuous thin films of β-Cu2V2O7, γ-Cu3V2O8, Cu11V6O26, and Cu5V2O10 are grown via reactive co-sputtering and their performance characteristics for the light-driven oxygen evolution reaction are evaluated. All four compounds have similar bandgaps in the range of 1.83-2.03 eV, though Cu-rich phases exhibit stronger optical absorption and higher charge separation efficiencies. Transient photocurrent analysis reveals a reduction of surface catalytic activity with increasing Cu:V elemental ratio due to competitive charge recombination at Cu-related surface states. This comprehensive analysis of PEC functionalities - including photon absorption, carrier separation, and heterogeneous charge transfer - informs strategies for improving PEC activity in the copper vanadate materials system and provides insights that may aid discovery, design, and engineering of new photoelectrode materials.",

keywords = "copper vanadate, photoanode, photoelectrochemistry, surface states, transient photocurrent analysis, water oxidation",

author = "Jiang, {Chang Ming} and Gideon Segev and Hess, {Lucas H.} and Guiji Liu and Gregory Zaborski and Toma, {Francesca M.} and Cooper, {Jason K.} and Sharp, {Ian D.}",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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doi = "10.1021/acsami.8b02977",

language = "אנגלית",

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T1 - Composition-Dependent Functionality of Copper Vanadate Photoanodes

AU - Jiang, Chang Ming

AU - Segev, Gideon

AU - Hess, Lucas H.

AU - Liu, Guiji

AU - Zaborski, Gregory

AU - Toma, Francesca M.

AU - Cooper, Jason K.

AU - Sharp, Ian D.

PY - 2018/4/4

Y1 - 2018/4/4

N2 - To understand functional roles of constituent elements in ternary metal oxide photoanodes, essential photoelectrochemical (PEC) properties are systematically analyzed on a series of copper vanadate compounds with different Cu:V elemental ratios. Homogeneous and highly continuous thin films of β-Cu2V2O7, γ-Cu3V2O8, Cu11V6O26, and Cu5V2O10 are grown via reactive co-sputtering and their performance characteristics for the light-driven oxygen evolution reaction are evaluated. All four compounds have similar bandgaps in the range of 1.83-2.03 eV, though Cu-rich phases exhibit stronger optical absorption and higher charge separation efficiencies. Transient photocurrent analysis reveals a reduction of surface catalytic activity with increasing Cu:V elemental ratio due to competitive charge recombination at Cu-related surface states. This comprehensive analysis of PEC functionalities - including photon absorption, carrier separation, and heterogeneous charge transfer - informs strategies for improving PEC activity in the copper vanadate materials system and provides insights that may aid discovery, design, and engineering of new photoelectrode materials.

AB - To understand functional roles of constituent elements in ternary metal oxide photoanodes, essential photoelectrochemical (PEC) properties are systematically analyzed on a series of copper vanadate compounds with different Cu:V elemental ratios. Homogeneous and highly continuous thin films of β-Cu2V2O7, γ-Cu3V2O8, Cu11V6O26, and Cu5V2O10 are grown via reactive co-sputtering and their performance characteristics for the light-driven oxygen evolution reaction are evaluated. All four compounds have similar bandgaps in the range of 1.83-2.03 eV, though Cu-rich phases exhibit stronger optical absorption and higher charge separation efficiencies. Transient photocurrent analysis reveals a reduction of surface catalytic activity with increasing Cu:V elemental ratio due to competitive charge recombination at Cu-related surface states. This comprehensive analysis of PEC functionalities - including photon absorption, carrier separation, and heterogeneous charge transfer - informs strategies for improving PEC activity in the copper vanadate materials system and provides insights that may aid discovery, design, and engineering of new photoelectrode materials.

KW - copper vanadate

KW - photoanode

KW - photoelectrochemistry

KW - surface states

KW - transient photocurrent analysis

KW - water oxidation

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Composition-Dependent Functionality of Copper Vanadate Photoanodes

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