Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 52, Pages 19027-19033Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201911303
Keywords
artificial photosynthesis; BiVO4; borate; photoelectrochemical cells; water oxidation
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Funding
- Swedish Research Council [2017-00935]
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation [KAW 2016.0072]
- National Basic Research Program of China (973 Program) [2014CB239402]
- China Scholarship Council
- European Community's Seventh Framework Programme (FP7/2007-2013) [312284]
- Czech Ministry of Education [LM2015057]
- CERIC users' grant
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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 BiVO4 in a borate buffer solution. This modifies the catalytic local environment of BiVO4 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 BiVO4 photoanode, without typical doping or catalyst modification, achieved a photocurrent density of 3.5 mA cm(-2) 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 BiVO4 photoanodes.
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