Volume 28, Issue 51 e202201169
Research Article

Facet Engineering on WO3 Mono-Particle-Layer Electrode for Photoelectrochemical Water Splitting

Wenrui Lin

Wenrui Lin

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

Contribution: Conceptualization (equal), Data curation (lead), Formal analysis (lead), ​Investigation (lead), Methodology (lead), Writing - original draft (lead)

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Boyang Zhang

Boyang Zhang

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Formal analysis (supporting), ​Investigation (equal), Methodology (equal)

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Kaiwei Liu

Kaiwei Liu

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Formal analysis (supporting), ​Investigation (equal), Methodology (equal)

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Dr. Jifang Zhang

Dr. Jifang Zhang

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

Contribution: Formal analysis (equal), Writing - review & editing (equal)

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Jiaming Wang

Jiaming Wang

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: ​Investigation (supporting), Methodology (supporting)

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Prof. Guijun Ma

Corresponding Author

Prof. Guijun Ma

School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210 P. R. China

Contribution: Conceptualization (equal), Funding acquisition (lead), Resources (lead), Supervision (equal), Writing - review & editing (equal)

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First published: 10 June 2022
Citations: 2

Graphical Abstract

Facet-aligned WO3 photoelectrodes: An electrode with planar configuration of massively assembled WO3 plates exposes (002) facets to the electrolyte so that bulk hole diffusion and interfacial charge transfer are facilitated. Photo-deposited Au at electron enriched {110} edges is positioned at the bottom to further improve charge collection to the substrate.

Abstract

Photoelectrochemical (PEC) performance of WO3 photoanodes for water splitting is heavily influenced by the orientation of crystal facets. In this work, mono-particle-layer electrodes, assembled by particulate WO3 square plates with highly uniform alignment along the (002) facet, improved PEC water oxidation kinetics and stability. Photo-deposition of Au along the cracks formed on the surface of the plates, which are the edges of {110} facets, was found to further enhance electron collection efficiency. Combination of these two strategies allowed the facet-engineered WO3 electrode to produce significantly higher efficiencies in charge separation and transfer than the electrode prepared without facet orientation. This work has provided a facile route for fabricating a structurally designed WO3 photoelectrode, which is also applicable to other regularly shaped semiconductor photocatalysts with anisotropic charge migration.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.