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Composition-Dependent Functionality of Copper Vanadate Photoanodes.

Chang-Ming Jiang, Gideon Segev, Lucas H Hess

  • 1Walter Schottky Institut and Physik Department , Technische Universität München , Am Coulombwall 4 , 85748 Garching , Germany.

ACS Applied Materials & Interfaces
|March 1, 2018
PubMed
Summary
This summary is machine-generated.

Copper vanadate photoanodes were studied for their roles in light-driven oxygen evolution. Higher copper content improved light absorption but reduced catalytic activity due to charge recombination.

Keywords:
copper vanadatephotoanodephotoelectrochemistrysurface statestransient photocurrent analysiswater oxidation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • Ternary metal oxides are promising photoanodes for energy conversion.
  • Understanding elemental roles in copper vanadates is crucial for optimizing photoelectrochemical (PEC) performance.

Purpose of the Study:

  • To systematically analyze the photoelectrochemical properties of copper vanadate compounds with varying Cu:V ratios.
  • To elucidate the functional roles of constituent elements in ternary metal oxide photoanodes for light-driven oxygen evolution.

Main Methods:

  • Thin films of β-Cu2V2O7, γ-Cu3V2O8, Cu11V6O26, and Cu5V2O10 were grown using reactive co-sputtering.
  • Photoelectrochemical properties, including optical absorption, charge separation efficiency, and heterogeneous charge transfer, were evaluated.
  • Transient photocurrent analysis was employed to assess surface catalytic activity.

Main Results:

  • All four copper vanadate compounds exhibited similar bandgaps (1.83-2.03 eV).
  • Copper-rich phases demonstrated enhanced optical absorption and charge separation efficiencies.
  • Increasing Cu:V ratio led to reduced surface catalytic activity, attributed to charge recombination at Cu-related surface states.

Conclusions:

  • The Cu:V elemental ratio significantly impacts PEC performance in copper vanadates.
  • Strategies for improving PEC activity can be informed by understanding charge recombination mechanisms.
  • This study provides insights for designing and engineering novel photoelectrode materials.