光催化
锌
氮化镓
材料科学
带隙
分解水
可见光谱
宽禁带半导体
镓
固溶体
氮化物
氧化物
无机化学
氧化镓
化学工程
光电子学
纳米技术
化学
冶金
催化作用
生物化学
图层(电子)
工程类
作者
Natsutogi Iwasa,Zhenyuan Teng,Guijun Ma,Takashi Hisatomi,Kazunari Domen
标识
DOI:10.1021/acs.chemmater.3c03262
摘要
(Ga1–xZnx)(N1–xOx), a solid solution of GaN and ZnO, is known as a photocatalyst capable of water splitting under visible light irradiation. However, it has been difficult to obtain well-crystallized (Ga1–xZnx)(N1–xOx) with a long absorption edge wavelength at a gram scale due to the loss of the ZnO component that is essential for band gap narrowing or the production of an explosive hydrogen byproduct during the synthesis. In this work, we demonstrate the gram-scale synthesis of ZnO-rich (Ga1–xZnx)(N1–xOx) with high crystallinity and a long-wavelength photoresponse by reacting hydrogen-free solid nitrogen sources in sealed evacuated tubes. The obtained (Ga1–xZnx)(N1–xOx) was almost stoichiometric and absorbed visible light up to a wavelength of 580 nm. Furthermore, the material could be activated for overall water splitting under visible light irradiation by the use of a mild nitridation treatment and by loading with cocatalysts to give an apparent quantum yield of 2 × 10–2% at 430 nm. This opens new possibilities for obtaining oxynitride photocatalysts with a long-wavelength photoresponse for water splitting through the use of hydrogen-free solid nitrogen sources in sealed evacuated tubes.
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