Flat and Stretched Delafossite α-AgGaO<sub>2</sub>: Manipulating Redox Chemistry under Visible Light
Yue Sun, Yajiao Li, Zhihao Li, Dongsheng Zhang, Wei Qiao, Yongwang Li, J. W. Niemantsverdriet, Wan‐Jian Yin, Ren Su
Abstract
The shape engineering of semiconductor photocatalysts has been frequently employed to improve the charge separation and thus the photocatalytic performance of hydrogen evolution and CO2 reduction, yet in the photosynthesis of value-added compounds, it is rarely reported. Here, we show that the photocatalytic reaction kinetics of several reductive and oxidative homocoupling processes can be manipulated via shape engineering of the AgGaO2 delafossite. While the flat AgGaO2 with dominant, electron-rich (001) facets shows a 20-fold enhancement over the stretched AgGaO2 with dominant, hole-rich (012) facets in the reductive homocoupling of benzyl bromide, the stretched AgGaO2 performs 4 times better than the flat AgGaO2 in the oxidative homocoupling of aniline. The shape engineered AgGaO2 can also be employed for efficient reductive coupling of nitrobenzenes and oxidative coupling of amines for the synthesis of azobenzenes and imines.