Efficient BiVO Photoanodes by Postsynthetic Treatment: Remarkable Improvements in Photoelectrochemical Performance from Facile Borate Modification.

Author(s) Meng, Q.; Zhang, B.; Fan, L.; Liu, H.; Valvo, M.; Edström, K.; Cuartero, M.; de Marco, R.; Crespo, G.A.; Sun, L.
Journal Angew Chem Int Ed Engl
Date Published 2019 Dec 19
Abstract

Water-splitting photoanodes based on semiconductor materials typically require a dopant in the structure and co-catalysts on the surface to overcome the problems of charge recombination and high catalytic barrier. Unlike these conventional strategies, a simple treatment is reported that involves soaking a sample of pristine BiVO in a borate buffer solution. This modifies the catalytic local environment of BiVO by the introduction of a borate moiety at the molecular level. The self-anchored borate plays the role of a passivator in reducing the surface charge recombination as well as that of a ligand in modifying the catalytic site to facilitate faster water oxidation. The modified BiVO photoanode, without typical doping or catalyst modification, achieved a photocurrent density of 3.5 mA cm at 1.23 V and a cathodically shifted onset potential of 250 mV. This work provides an extremely simple method to improve the intrinsic photoelectrochemical performance of BiVO photoanodes.

DOI 10.1002/anie.201911303
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2019;58(52):1902719033.

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