期刊
NANO RESEARCH
卷 8, 期 11, 页码 3524-3534出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0852-5
关键词
water splitting; photoelectrochemical cells; nanosheets; atomic layer deposition; multijunction
类别
资金
- National Natural Science Foundation of China [51422206, 51372159]
- 1000 Talents Plan for Young Researchers, Shuangchuang Program of Jiangsu Province
- Jiangsu Science and Technology Committee for Distinguished Young Scholars [BK20140009]
- National Basic Research Program of China (973 Program) [2015CB358600]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Photoelectrodes with a specific structure and composition have been proposed for improving the efficiency of solar water splitting. Here, a novel multijunction structure was fabricated, with Si nanowires as cores, ZnIn2S4 nanosheets as branches, and TiO2 films as sandwiched layers. This junction exhibited a superior photoelectrochemical performance with a maximum photoconversion efficiency of 0.51%, which is 795 and 64 times higher than that of a bare Si wafer and nanowires, respectively. The large enhancement was attributed to the effective electron-hole separation and fast excited carrier transport within the multijunctions resulting from their favorable energy band alignments with water redox potentials, and to the enlarged contact area for facilitating the electron transfer at the multijunction/electrolyte interface.
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