Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 52, Pages 19087-19095Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912475
Keywords
bismuth vanadate; oxygen vacancies; perovskite solar cells; photoelectrochemical water splitting; polaron hopping
Categories
Funding
- Shenzhen Peacock Plan [KQTD2016053015544057]
- Nanshan Pilot Plan [LHTD20170001]
- Guangdong Science and Technology Program [2017B030314002]
- NSFC/Hong Kong RGC Research Scheme [N_HKUST610/14]
- Science and Technology Plan Project of Guangzhou [201804020025, 2018A030310300]
- National Key Research and Development Program of China [2016YFA0202604]
- NSFC [21972006, 5181101551, 51905006, 51961165105, 21461162003, 21773315, 21706295]
- China Postdoctoral Science Foundation [2018M631240]
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The BiVO4 photoelectrochemical (PEC) electrode in tandem with a photovoltaic (PV) cell has shown great potential to become a compact and cost-efficient device for solar hydrogen generation. However, the PEC part is still facing problems such as the poor charge transport efficiency owing to the drag of oxygen vacancy bound polarons. In the present work, to effectively suppress oxygen vacancy formation, a new route has been developed to synthesize BiVO4 photoanodes by using a highly oxidative two-dimensional (2D) precursor, bismuth oxyiodate (BiOIO3), as an internal oxidant. With the reduced defects, namely the oxygen vacancies, the bound polarons were released, enabling a fast charge transport inside BiVO4 and doubling the performance in tandem devices based on the oxygen vacancy eliminated BiVO4. This work is a new avenue for elaborately designing the precursor and breaking the limitation of charge transport for highly efficient PEC-PV solar fuel devices.
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