期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 47, 页码 16800-16805出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908833
关键词
charge separation; energy conversion; photoelectrochemistry; porphyrinoids; water splitting
资金
- Natural Science Foundation of China [21575115, 21705117]
- Program for Chang Jiang Scholars and Innovative Research Teams, Ministry of Education, China [IRT-16R61]
- Program of Gansu Provincial Higher Education Research Project [2017-D-01]
Surface recombination at the photoanode/electrolyte junction seriously impedes photoelectrochemical (PEC) performance. Through coating of photoanodes with oxygen evolution catalysts, the photocurrent can be enhanced; however, current systems for water splitting still suffer from high recombination. We describe herein a novel charge transfer system designed with BiVO4 as a prototype. In this system, porphyrins act as an interfacial-charge-transfer mediator, like a volleyball setter, to efficiently suppress surface recombination through higher hole-transfer kinetics rather than as a traditional photosensitizer. Furthermore, we found that the introduction of a setter can ensure a long lifetime of charge carriers at the photoanode/electrolyte interface. This simple interface charge-modulation system exhibits increased photocurrent density from 0.68 to 4.75 mA cm(-2) and provides a promising design strategy for efficient photogenerated charge separation to improve PEC performance.
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