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2D Bismuthene as a Functional Interlayer between BiVO_{4} and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

Cui, Junyi; Daboczi, Matyas; Regue, Miriam; Chin, Yi‐Chun; Pagano, Katia; Zhang, Jifang; Isaacs, Mark A; ... Eslava, Salvador; + view all (2022) 2D Bismuthene as a Functional Interlayer between BiVO_{4} and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes. Advanced Functional Materials , Article 2207136. 10.1002/adfm.202207136. (In press). Green open access

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Abstract

BiVO_{4} has attracted wide attention for oxygen-evolution photoanodes in water-splitting photoelectrochemical devices. However, its performance is hampered by electron-hole recombination at surface states. Herein, partially oxidized two-dimensional (2D) bismuthene is developed as an effective, stable, functional interlayer between BiVO4 and the archetypal NiFeOOH co-catalyst. Comprehensive (photo)electrochemical and surface photovoltage characterizations show that NiFeOOH can effectively increase the lifetime of photogenerated holes by passivating hole trap states of BiVO_{4}; however, it is limited in influencing electron trap states related to oxygen vacancies (V_{O}). Loading bismuthene on BiVO_{4} photoanodes increases the density of V_{O} that are beneficial for the oxygen evolution reaction via the formation of oxy/hydroxyl-based water oxidation intermediates at the surface. Moreover, bismuthene increases interfacial band bending and fills the V_{O}-related electron traps, leading to more efficient charge extraction. With the synergistic interaction of bismuthene and NiFeOOH on BiVO_{4}, this composite photoanode achieves a 5.8-fold increase in photocurrent compared to bare BiVO4 reaching a stable 3.4 (±0.2) mA cm^{–2} at a low bias of +0.8 V_{RHE} or 4.7(±0.2) mA cm^{–2} at +1.23 V_{RHE}. The use of 2D bismuthene as functional interlayer provides a new strategy to enhance the performance of photoanodes.

Type: Article
Title: 2D Bismuthene as a Functional Interlayer between BiVO_{4} and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/adfm.202207136
Publisher version: https://doi.org/10.1002/adfm.202207136
Language: English
Additional information: © 2022 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
Keywords: 2D bismuthene, BiVO 4 photoanodes, co-catalysts, oxygen vacancies, surface states
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10155667
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