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).
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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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