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BiVO4-Cu2O/CuO Nanocubes with High Charge Injection and Charge Separation Rates for Enhanced Photoelectrochemical

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This study developed a bismuth vanadate (BiVO4) heterojunction with copper oxide nanocubes (NCs) to improve water oxidation. The new material significantly boosted oxygen evolution current density, showcasing enhanced charge separation and injection efficiencies.

Keywords:
bismuth vanadatecharge injection efficiencycharge separation efficiencycopper oxidenanocubesnanowiresoxygen evolutionphotoanode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • Bismuth vanadate (BiVO4) is a promising photoanode material for water oxidation due to its suitable band gap.
  • Key limitations of BiVO4 include poor charge carrier separation and surface recombination, hindering its efficiency.

Purpose of the Study:

  • To enhance the photoanodic performance of BiVO4 for water oxidation.
  • To investigate the effect of heterojunctions with copper oxides on charge dynamics and catalytic activity.

Main Methods:

  • Fabrication of a BiVO4-Cu2O/CuO nanocube (NC) heterojunction.
  • Comparison with BiVO4 modified with CuO nanowires (NWs).
  • Electrochemical measurements to assess photocurrent density and charge transfer efficiencies.

Main Results:

  • The BiVO4-Cu2O/CuO NC heterojunction achieved an oxygen evolution current density of 2.3 mA/cm2 at 1.23 V vs RHE, outperforming bare BiVO4 (1.4 mA/cm2).
  • The NC heterojunction improved charge injection and separation efficiencies to over 60% at 1.23 V vs RHE.
  • CuO NWs enhanced charge injection but only moderately improved charge separation (49%).

Conclusions:

  • The interface engineering between BiVO4 and the catalyst layer is crucial for enhanced photocurrent.
  • Cu2O/CuO NCs act as an effective hole-extracting heterojunction and catalyst, while CuO NWs primarily function as a catalyst.