2D Bismuthene as a Functional Interlayer between BiVO4 and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

Junyi Cui; Matyas Daboczi; Miriam RegueYi-Chun ChinKatia PaganoJifang ZhangMark A. IsaacsGwilherm KerherveAris MorntoJames WestSixto GimenezJi-Seon KimSalvador Eslava

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2D Bismuthene as a Functional Interlayer between BiVO4 and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

机译：2D Bismuthene as a Functional Interlayer between BiVO4 and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

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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 BiVO_4 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 BiVO_4 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.

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《Advanced functional materials》 |2022年第44期|2207136.1-2207136.13|共13页
作者
Junyi Cui; Matyas Daboczi; Miriam RegueYi-Chun ChinKatia PaganoJifang ZhangMark A. IsaacsGwilherm KerherveAris MorntoJames WestSixto GimenezJi-Seon KimSalvador Eslava;
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Department of Chemical Engineering Imperial College London London SW7 2AZ, UK;

Institute of Advanced Materials (INAM) Universitat Jaume I Castello 12006, Spain;

Department of Physics Imperial College London London SW7 2AZ, UKSchool of Physical Science and Technology Shanghai Tech University Shanghai 201210, P. R. ChinaDepartment of Chemistry University College London London WC1H 0AJ, UKDepartment of Materials Imperial College London London SW7 2AZ, UK;

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2D bismuthene; BiVO_4 photoanodes; co-catalysts; oxygen vacancies; surface states;

2D Bismuthene as a Functional Interlayer between BiVO4 and NiFeOOH for Enhanced Oxygen-Evolution Photoanodes

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