期刊
CHEMCATCHEM
卷 9, 期 19, 页码 3752-3761出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201700542
关键词
hollow nanospheres; H-2 evolution; photocatalysis; visible light; Z-scheme
资金
- National Natural Science Fund Committee-Baosteel Group Corporation Steel Joint Research Fund, China [U1460105]
- National Science Foundation of China [51521065]
- Fundamental Research Funds for the Central Universities, China [2015gjhz06]
The Z-scheme photocatalytic system for water splitting based on semiconductors has exhibited great potential for H-2 fuel production from renewable resources. In this work, we constructed g-C3N4/Au/C-TiO2 hollow spheres as an all-solid-state Z-scheme photocatalytic system with Au nanoparticles as the electron mediator. The as-synthesized g-C3N4/Au/C-TiO2 photocatalyst showed a remarkably enhanced photocatalytic H-2 evolution rate under visible-light irradiation (lambda > 420nm), which was 86 and 42times higher than those of pure C-TiO2 and g-C3N4, respectively. The enhancement of photocatalytic performance can be mainly attributed to the intentionally designed Z-scheme system, which not only promoted the efficient transfer and separation of photogenerated electron-hole pairs, but also retained the strong redox ability of the charge carriers. In addition, the Z-scheme system also achieved high visible-light absorption and utilization owing to the surface plasmon resonance (SPR) effect of Au nanoparticles and hollow structures of C-TiO2. All the factors synergistically promote the photocatalytic activity of the g-C3N4/Au/C-TiO2 hollow nanospheres, providing a promising method for the rational design of highly efficient visible-light-driven photocatalysts.
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