Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 46, Pages 14260-14264Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201606424
Keywords
CO2 reduction; Co-catalysts; energy conversion; semiconductors; solar fuel
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Climate Change and Emissions Management Corporation (CCEMC)
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Syngas, the mixture of CO and H-2, is a key feedstock to produce methanol and liquid fuels in industry, yet limited success has been made to develop clean syngas production using renewable solar energy. We demonstrated that syngas with a benchmark turnover number of 1330 and a desirable CO/H-2 ratio of 1: 2 could be attained from photoelectrochemical CO2 and H2O reduction in an aqueous medium by exploiting the synergistic co-catalytic effect between Cu and ZnO. The CO/H-2 ratio in the syngas products was tuned in a large range between 2: 1 and 1: 4 with a total unity Faradaic efficiency. Moreover, a high Faradaic efficiency of 70% for CO was acheived at underpotential of 180 mV, which is the lowest potential ever reported in an aqueous photoelectrochemical cell. It was found that the combination of Cu and ZnO offered complementary chemical properties that lead to special reaction channels not seen in Cu, or ZnO alone.
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