Selective CO Evolution from Photoreduction of CO₂ on a Metal-Carbide-Based Composite Catalyst
2018
Men, Yu-Long | You, Ya | Pan, Yun-Xiang | Gao, Hongcai | Xia, Yang | Cheng, Dang-Guo | Song, Jie | Cui, Da-Xiang | Wu, Nan | Li, Yutao | Xin, Sen | Goodenough, John B.
A selective CO evolution from photoreduction of CO₂ in water was achieved on a noble-metal-free, carbide-based composite catalyst, as demonstrated by a CO selectivity of 98.3% among all carbon-containing products and a CO evolution rate of 29.2 μmol h–¹, showing superiority to noble-metal-based catalyst. A rapid separation of the photogenerated electron–hole pairs and improved CO₂ adsorption on the surface of the carbide component are responsible for the excellent performance of the catalyst. The high CO selectivity is accompanied by a predominant H₂ evolution, which is believed to provide a proton-deficient environment around the catalyst to favor the formation of hydrogen-deficient carbon products. The present work provides general insights into the design of a catalyst with a high product selectivity and also the carbon evolution chemistry during a photocatalytic reaction.
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