Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 231, Issue -, Pages 381-390Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.03.040
Keywords
Two dimensional materials; Fullerene-shell structure; WO3-x nanosheets; Plasmonic Ag nanoparticles; PEC conversion
Funding
- National Natural Science Foundation of China [21773216, 51173170, 21633015, 21571157]
- Innovation Talents Award of Henan Province [114200510019]
- Key program of science and technology from Zhengzhou Bureau of science and technology [121PZDGG213]
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Photoelectrochemical (PEC) water splitting has been a promising approach for solar energy conversion to meet the clean energy demand. Design and fabrication of high-quality photoelectrode for water splitting with enhanced light absorption, as well as efficient charge separation and transport are challenging. Herein, two-dimensional (2D) WO3-x nanosheets with unique fullerene shell-like nanostructure are prepared with assistance of supercritical CO2(SC CO2). Then a novel plasmonic photoanode heterostructure composed of plasmonic Ag and fullerene shell-WO3-x is synthesized for PEC water splitting and photooxidation degradation. The unique coexistence of amorphous and crystalline structure of WO3-x leads to uniformly distribution of Ag nanoparticles, simultaneously increasing the active site density and improving the electron transport. Femtosecond time-resolved IR absorption spectrum analysis indicates the surface plasmonic resonance (SPR) effect of Ag nanoparticles can mediate efficient electron transfer to fullerene shell-WO3-x nanosheets. The photoresponse of the plasmonic Ag/fullerene shell-WO3-x heterostructure is 2.5 times higher than that of fullerene shell-WO3-x. By combining the synergistic effects of the special microstructures of plasmonic Ag and fullerene shell-WO3-x, we are able to design a low-cost photoelectronic catalyst for efficient PEC water splitting and photooxidation degradation. The strategy developed here provides a fascinating way to synthesize high efficient photoelectronic catalysts for solar energy conversion.
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