In Situ Formation of Oxygen Vacancies Achieving Near‐Complete Charge Separation in Planar BiVO4 Photoanodes

Songcan Wang; Tianwei He; Peng Chen; Aijun Du; Kostya (Ken) Ostrikov; Wei Huang; Lianzhou Wang

doi:10.1002/adma.202001385

journal article May 14, 2020

In Situ Formation of Oxygen Vacancies Achieving Near‐Complete Charge Separation in Planar BiVO4 Photoanodes

Songcan Wang

Tianwei He

Peng Chen

Aijun Du

Kostya (Ken) Ostrikov

Wei Huang

Lianzhou Wang

Advanced Materials Vol. 32 No. 26 · Wiley

View at Publisher Save 10.1002/adma.202001385

Abstract

AbstractDespite a suitable bandgap of bismuth vanadate (BiVO4) for visible light absorption, most of the photogenerated holes in BiVO4 photoanodes are vanished before reaching the surfaces for oxygen evolution reaction due to the poor charge separation efficiency in the bulk. Herein, a new sulfur oxidation strategy is developed to prepare planar BiVO4 photoanodes with in situ formed oxygen vacancies, which increases the majority charge carrier density and photovoltage, leading to a record charge separation efficiency of 98.2% among the reported BiVO4 photoanodes. Upon loading NiFeOx as an oxygen evolution cocatalyst, a stable photocurrent density of 5.54 mA cm−2 is achieved at 1.23 V versus the reversible hydrogen electrode (RHE) under AM 1.5 G illumination. Remarkably, a dual‐photoanode configuration further enhances the photocurrent density up to 6.24 mA cm−2, achieving an excellent applied bias photon‐to‐current efficiency of 2.76%. This work demonstrates a simple thermal treatment approach to generate oxygen vacancies for the design of efficient planar photoanodes for solar hydrogen production.

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Citations

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References

Details

Published: May 14, 2020
Vol/Issue: 32(26)
License: View

Authors

S

Songcan Wang

Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 China; Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia

T

Tianwei He

School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology Brisbane QLD 4000 Australia

P

Peng Chen

Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia

A

Aijun Du

School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology Brisbane QLD 4000 Australia

K

Kostya (Ken) Ostrikov

School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology Brisbane QLD 4000 Australia

W

Wei Huang

Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 China

L

Lianzhou Wang

Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia

Funding

Australian Research Council

Fundamental Research Funds for the Central Universities

Australian National Fabrication Facility

Northwestern Polytechnical University

Cite This Article

Songcan Wang, Tianwei He, Peng Chen, et al. (2020). In Situ Formation of Oxygen Vacancies Achieving Near‐Complete Charge Separation in Planar BiVO4 Photoanodes. Advanced Materials, 32(26). https://doi.org/10.1002/adma.202001385

In Situ Formation of Oxygen Vacancies Achieving Near‐Complete Charge Separation in Planar BiVO4 Photoanodes

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