光催化
石墨氮化碳
分解水
可见光谱
纳米片
材料科学
氮化碳
水溶液
三乙醇胺
光催化分解水
氮化物
碳纤维
光化学
催化作用
纳米技术
化学
分析化学(期刊)
物理化学
光电子学
有机化学
图层(电子)
复合数
复合材料
作者
Shunta Nishioka,Kumiko Shibata,Yugo Miseki,Kazuhiro Sayama,Kazuhiko Maeda
出处
期刊:Chinese Journal of Catalysis
[China Science Publishing & Media Ltd.]
日期:2022-09-01
卷期号:43 (9): 2316-2320
被引量:8
标识
DOI:10.1016/s1872-2067(21)64015-9
摘要
Pt-loaded graphitic carbon nitride (g-C3N4) is known to be a good photocatalyst for H2 evolution under visible light. In most cases, however, sacrificial electron donors such as triethanolamine are required for the water-splitting operation, and nonsacrificial H2 evolution by g-C3N4 remains a challenge. In this work, we investigated the photocatalytic activities of carbon nitride nanosheet (NS-C3N4), which was prepared by thermal treatment of urea, for nonsacrificial H2 evolution using reversible electron donors under visible light (λ > 400 nm). Whereas Pt-loaded NS-C3N4 did not produce H2 from aqueous solutions containing I−, Fe2+, or [Fe(CN)6]4–, modification of the Pt/NS-C3N4 photocatalyst with CrOx led to observable H2 evolution. Transmission electron microscopy observations and energy-dispersive X-ray spectroscopic analysis suggested that a Pt-core/CrOx-shell structure was formed on the NS-C3N4. The CrOx/Pt/NS-C3N4 served as a H2-evolution photocatalyst for visible-light-driven Z-scheme overall water splitting, in combination with a modified WO3 photocatalyst, in the presence of a [Fe(CN)6]3–/4– redox mediator.
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