Issue 14, 2024, Issue in Progress

Modified photoanode by in situ growth of covalent organic frameworks on BiVO4 for oxygen evolution reaction

Abstract

The development of efficient oxygen evolution reaction (OER) catalysts is of great significance because the water oxidation reaction at the photoanode is the rate-determining step in photoelectrocatalytic (PEC) water splitting. Herein, two hybrid photoanodes named BiVO4/COF-Azo and BiVO4/COF-Ben were prepared by in situ solvothermal growth on a modified BiVO4 photoanode. Characterization results revealed that the Azo and Ben COFs could match with BiVO4 well to form heterojunctions, which could effectively enhance the separation efficiency of photogenerated carriers. Also, the smaller impedance of the composite photoanodes and faster kinetics of the water oxidation reaction promoted the charge transmission and enhanced the reaction efficiency of the surface-reaching holes, respectively. As a result, the composite photoanodes exhibited a larger photocurrent and more negative onset potential compared to the pristine BiVO4. This work not only provides a new strategy to construct efficient hybrid photoanodes, but also expands the applications of COFs.

Graphical abstract: Modified photoanode by in situ growth of covalent organic frameworks on BiVO4 for oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2024
Accepted
15 Mar 2024
First published
22 Mar 2024
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2024,14, 9609-9618

Modified photoanode by in situ growth of covalent organic frameworks on BiVO4 for oxygen evolution reaction

A. Guo, X. Wu, S. H. Ali, H. Shen, L. Chen, Y. Li and B. Wang, RSC Adv., 2024, 14, 9609 DOI: 10.1039/D4RA00899E

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