Abstract
The challenge of photoelectrochemical reduction of CO2 is to design highly selective, highly efficient and non-precious metal catalysts. In this study, Cu-In alloy nanoparticles-modified CuInS2 (Cu-In/CuInS2) composite thin film electrodes are fabricated by electrodeposition of Cu-In alloy nanoparticles on the CuInS2 thin films. At Cu-In electrodeposition time of 10 s, the relative content of indium in Cu-In/CuInS2 composite thin film electrodes is the highest; and the resulted electrode exhibits the highest catalytic activity of ethanol. The electrochemical impedance spectroscopy results show that the rate of CO2 reduction is determined by both the charge transfer resistance and mass transport limitation. The modification of the Cu-In alloy significantly improves the surface coverage of the adsorbed CO and inhibits hydrogen evolution reaction, thus promotes the C-C coupling. Therefore the selectivity for the formation of ethanol is improved pronouncedly.
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