Composition-Dependent Functionality of Copper Vanadate Photoanodes

doi:10.1021/acsami.8b02977

Title: Composition-Dependent Functionality of Copper Vanadate Photoanodes

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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. Here, homogeneous and highly continuous thin films of β-Cu ₂V ₂O ₇, γ-Cu ₃V ₂O ₈, Cu ₁₁V ₆O ₂₆, and Cu ₅V ₂O ₁₀ 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 reveals insights that may aid discovery, design, and engineering of new photoelectrode materials.

Authors:

^[1]; Segev, Gideon ^[1]; Hess, Lucas H. ^[1]; Liu, Guiji ^[1]; Zaborski, Gregory ^[1]; Toma, Francesca M. ^[1]; Cooper, Jason K. ^[1];

^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Technische Univ. Munchen, Garching (Germany)

Publication Date:: 2018-02-28

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

OSTI Identifier:: 1506303

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: ACS Applied Materials and Interfaces

Additional Journal Information:: Journal Volume: 10; Journal Issue: 13; Journal ID: ISSN 1944-8244

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; copper vanadate; photoanode; photoelectrochemistry; surface states; transient photocurrent analysis; water oxidation

Citation Formats


                    Jiang, Chang-Ming, Segev, Gideon, Hess, Lucas H., Liu, Guiji, Zaborski, Gregory, Toma, Francesca M., Cooper, Jason K., and Sharp, Ian D. Composition-Dependent Functionality of Copper Vanadate Photoanodes.  United States: N. p., 2018. 
        Web.  doi:10.1021/acsami.8b02977.

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                    Jiang, Chang-Ming, Segev, Gideon, Hess, Lucas H., Liu, Guiji, Zaborski, Gregory, Toma, Francesca M., Cooper, Jason K., & Sharp, Ian D. Composition-Dependent Functionality of Copper Vanadate Photoanodes.  United States.  doi:10.1021/acsami.8b02977.

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                    Jiang, Chang-Ming, Segev, Gideon, Hess, Lucas H., Liu, Guiji, Zaborski, Gregory, Toma, Francesca M., Cooper, Jason K., and Sharp, Ian D. Wed .  
        "Composition-Dependent Functionality of Copper Vanadate Photoanodes".  United States.  doi:10.1021/acsami.8b02977.  https://www.osti.gov/servlets/purl/1506303.

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@article{osti_1506303,

  title        = {Composition-Dependent Functionality of Copper Vanadate Photoanodes},

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

  abstractNote = {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. Here, 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 reveals insights that may aid discovery, design, and engineering of new photoelectrode materials.},

  doi          = {10.1021/acsami.8b02977},

  journal      = {ACS Applied Materials and Interfaces},

  number       = 13,

  volume       = 10,

  place        = {United States},

  year         = {2018},

  month        = {2}

}

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DOI: 10.1021/acsami.8b02977

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