期刊
NANO RESEARCH
卷 14, 期 5, 页码 1294-1304出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3145-6
关键词
Z-scheme photocatalyst; ultrathin BiVO4 nanosheet; porphyrin derivative; overall water splitting; artificial photosynthesis
类别
资金
- National Natural Science Foundation of China [21975190, 21871215, 21573166, 21271146]
- Science and Technology Planning Project of Shenzhen Municipality [JCYJ20180302153921190]
- Fund for Innovative Research Groups of Hubei Province [2014CFA007]
This study successfully developed an artificial photosynthetic system for overall water splitting driven by sunlight, achieving efficient photosynthesis through a two-step excitation Z-scheme charge transfer mechanism.
It is highly desirable to simulate natural photosynthesis by using sunlight to drive the overall water splitting without using external bias and sacrificial agent. Herein, few-layer monoclinic BiVO4 nanosheets (BVNS) with a thickness of (similar to)4.3 nm, exposed (010) facets and abundant oxygen vacancies are fabricated using graphene oxide dots as templating reagent. After decorating with asymmetric chromium porphyrin derivative bearing one benzoic acid and three phenyls as meso-position substituents (chromium-5-(4-carboxyphenyl)-10,15,20-triphenylporphrin, CrmTPP) and PtOx cocatalyst, the obtained two-dimensional (2D) hybrid nanocomposite (BVNS/CrmTPP/Pt) with an optimal component ratio delivers a robust overall water splitting performance with a relatively high apparent quantum yield (8.67%) at 400 nm monochromatic light. The ultrathin structure and widely distributed oxygen vacancies on the exposed (010) facets of BVNS not only endow strong and intimate contact with the decorated CrmTPP molecules to promote a two-step excitation Z-scheme charge transfer mechanism for preserving the high redox ability of the photogenerated charge carriers, but also alleviate their recombination, and thus causing the robust overall water splitting performance of the 2D hybrid nanocomposites. The present results provide a novel strategy to construct highly efficient artificial photosynthetic system for overall water splitting.
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