Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 40, Pages 13071-13077Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b08552
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Funding
- National Natural Science Foundation of China [21503062, U1662138, 21622606]
- National Key R&D Program of China [2017FYA0205300, 2016YFA0202900]
- Lawrence Berkeley National Laboratory BMR Program [7223523]
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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 mu mol 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 H-2 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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