期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-05580-z
关键词
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资金
- National Natural Science Foundation of China [51402100, 21573066]
- Provincial Natural Science Foundation of Hunan [2016JJ1006, 2016TP1009]
- Shanghai Sailing Program [17YF1429800]
- Australian Research Council [DP180100568]
The trade-offs between photoelectrode efficiency and stability significantly hinder the practical application of silicon-based photoelectrochemical devices. Here, we report a facile approach to decouple the trade-offs of silicon-based photocathodes by employing crystalline TiO2 with graded oxygen defects as protection layer. The crystalline protection layer provides high-density structure and enhances stability, and at the same time oxygen defects allow the carrier transport with low resistance as required for high efficiency. The silicon-based photocathode with black TiO2 shows a limiting current density of similar to 35.3 mA cm(-2) and durability of over 100 h at 10 mA cm(-2) in 1.0 M NaOH electrolyte, while none of photoelectrochemical behavior is observed in crystalline TiO2 protection layer. These findings have significant suggestions for further development of silicon-based, III-V compounds and other photo-electrodes and offer the possibility for achieving highly efficient and durable photoelectrochemical devices.
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