期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 29, 页码 15608-15614出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp02391a
关键词
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资金
- National Basic Research Program of the Ministry of Science and Technology, China [2014CB239400]
- National Natural Science Foundation of China [21061140361, 21090340]
- Solar Energy Action Plan of Chinese Academy of Sciences [KGCX2-YW-399+7-3]
The solar-to-hydrogen (STH) efficiency of a traditional mono-photoelectrode photoelectrochemical water splitting system has long been limited as large external bias is required. Herein, overall water splitting with STH efficiency exceeding 2.5% was achieved using a self-biased photoelectrochemical-photovoltaic coupled system consisting of an all earth-abundant photoanode and a Si-solar-cell-based photocathode connected in series under parallel illumination. We found that parallel irradiation mode shows higher efficiency than tandem illumination especially for photoanodes with a wide light absorption range, probably as the driving force for water splitting reaction is larger and the photovoltage loss is smaller in the former. This work essentially takes advantage of a tandem solar cell which can enhance the solar-to-electricity efficiency from another point of view.
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