仿生 Z 型 g-CN/AgCrO 用于高效可见光光催化制氢。

Bio-inspired Z-scheme g-CN/AgCrO for efficient visible-light photocatalytic hydrogen generation.

机构信息

Key Laboratory of Bio-inspired Smart Interfacial Science, Technology of Ministry of Education and Beijing Advanced Innovation Center for Biomedical Engineering, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.

National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.

出版信息

Sci Rep. 2018 Nov 7;8(1):16504. doi: 10.1038/s41598-018-34287-w.

Due to low charge separation efficiency and poor stability, it is usually difficult for single-component photocatalysts such as graphitic carbon nitride (g-CN) and silver chromate (AgCrO) to fulfill photocatalytic hydrogen production efficiently. Z-scheme charge transport mechanism that mimics the photosynthesis in nature is an effective way to solve the above problems. Inspired by photosynthesis, we report AgCrO nanoparticles-decorated g-CN nanosheet as an efficient photocatalyst for hydrogen evolution reaction (HER) with methanol as sacrificial agent. The formation of Z-scheme g-CN/AgCrO nanosheets photocatalysts could inhibit the recombination of photogenerated electron-hole pairs, promote the generation of hydrogen by photosplitting of water. The experiment results indicate that g-CN/AgCrO nanocomposites present enhanced photocatalytic activity and stability in the H evolution of water splitting. And the nanocomposites g-CN/AgCrO(23.1%) show the 14 times HER efficiency compared to that of bare g-CN.

由于电荷分离效率低和稳定性差，石墨相氮化碳（g-CN）和铬酸银（AgCrO）等单一成分光催化剂通常难以高效地进行光催化产氢。模拟自然界光合作用的 Z 型电荷传输机制是解决上述问题的有效途径。受光合作用的启发，我们报告了 AgCrO 纳米颗粒修饰的 g-CN 纳米片作为一种高效的光催化剂，用于甲醇作为牺牲剂的析氢反应（HER）。Z 型 g-CN/AgCrO 纳米片光催化剂的形成可以抑制光生电子-空穴对的复合，促进水的光解产生氢气。实验结果表明，g-CN/AgCrO 纳米复合材料在水分解的 H 演化中表现出增强的光催化活性和稳定性。并且与裸 g-CN 相比，g-CN/AgCrO（23.1%）复合材料的 HER 效率提高了 14 倍。