Gold-Sensitized Silicon/ZnO Core/Shell Nanowire Array for Solar Water Splitting

Solar water splitting represents one of the most promising strategies in the quest for clean and renewable energy. However, low conversion efficiency, use of sacrificial agents, and external bias for current water splitting system limit its practical application. Here, a gold-sensitized Si/ZnOcore/s...

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Bibliographic Details
Published in:Frontiers in chemistry 2019-04, Vol.7, p.206-206
Main Authors: Zhang, Fu-Qiang, Hu, Ya, Sun, Rui-Nan, Fu, Haoxin, Peng, Kui-Qing
Format: Article
Language:English
Subjects:
Chemistry
core/shell heterostructure
photosensitization
silicon nanowire
solar water splitting
ZnO
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Summary:Solar water splitting represents one of the most promising strategies in the quest for clean and renewable energy. However, low conversion efficiency, use of sacrificial agents, and external bias for current water splitting system limit its practical application. Here, a gold-sensitized Si/ZnOcore/shell nanowire photoelectrochemical (PEC) cell is reported for efficient solar water oxidation. We demonstrated gold-sensitized n-Si/n-ZnO nanowire arrays exhibited higher energy conversion efficiency than gold-sensitized p-Si/n-ZnO nanowire arrays due to the favorable energy-band alignment characteristics. Without any assistance from an external electrical source and sacrificial reagents, gold-sensitized n-Si/n-ZnO core/shell nanowire array photoanode achieved unbiased water splitting under simulated solar light illumination. This method opens a promising venue to cost-efficient production of solar fuels.
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2019.00206