光催化
分解水
光催化分解水
钙钛矿(结构)
材料科学
带隙
半导体
无定形固体
氧化还原
太阳能
可见光谱
化学工程
纳米技术
光电子学
催化作用
化学
结晶学
冶金
生物
工程类
生物化学
生态学
作者
Chengsi Pan,Tsuyoshi Takata,Mamiko Nakabayashi,Takao Matsumoto,Naoya Shibata,Yuichi Ikuhara,Kazunari Domen
标识
DOI:10.1002/anie.201410961
摘要
One of the simplest methods for splitting water into H2 and O2 with solar energy entails the use of a particulate-type semiconductor photocatalyst. To harness solar energy efficiently, a new water-splitting photocatalyst that is active over a wider range of the visible spectrum has been developed. In particular, a complex perovskite-type oxynitride, LaMg(x)Ta(1-x)O(1+3x)N(2-3x)(x≥1/3), can be employed for overall water splitting at wavelengths of up to 600 nm. Two effective strategies for overall water splitting were developed. The first entails the compositional fine-tuning of a photocatalyst to adjust the bandgap energy and position by forming a series of LaMg(x)Ta(1-x)O(1+3x)N(2-3x) solid solutions. The second method is based on the surface coating of the photocatalyst with a layer of amorphous oxyhydroxide to control the surface redox reactions. By combining these two strategies, the degradation of the photocatalyst and the reverse reaction could be prevented, resulting in successful overall water splitting.
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