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Non‐oxidative Coupling of Methane: N‐type Doping of Niobium Single Atoms in TiO2–SiO2 Induces Electron Localization
来源: | 作者:吴仕群 | 发布时间: 2021-03-26 | 241 次浏览 | 分享到:
Dr. Ziyu Chen Dr. Shiqun Wu Dr. Jiayu Ma Prof. Shinya Mine Prof. Takashi Toyao Prof. Masaya Matsuoka Prof. Lingzhi Wang Prof. Jinlong Zhang
First published: 27 January 2021 https://doi.org/10.1002/anie.202016420
Photodriven nonoxidative coupling of CH4 (NOCM) is an attractive potential way to use abundant methane resources. Herein, an n‐type doped photocatalyst for NOCM is created by doping single‐atom Nb into hierarchical porous TiO2–SiO2 (TS) microarray, which exhibits a high conversion rate of 3.57 μmol g−1 h−1 with good recyclability. The Nb dopant replaces the 6‐coordinated titanium on the (1 0 1) plane and forms shallow electron‐trapped surface polarons along [0 1 0] direction and the comparison of different models proves that the electron localization caused by the n‐type doping is beneficial to both methane activation and ethane desorption. The positive effect of n‐type dopant on CH4 conversion is further verified on Mo‐, W‐ and Ta‐doped composites. In contrast, the doping of p‐type dopant (Ga, Cu, Fe) shows a less active influence.