Journal
JOURNAL OF CATALYSIS
Volume 349, Issue -, Pages 1-7Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.01.013
Keywords
Ni foam; Light quantum efficiency; CO2 reduction; Covalent ligand; Isotopic labeling experiments
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Funding
- National Natural Science Foundation of China [NSFC 21173106, 21401091]
- Fundamental Research Funds for the Central Universities [lzujbky-2016-K09]
- Foundation of the State Key Laboratory of Coal Conversion [J16-17-913]
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We report new insights into the photoelectrochemical reduction of CO2 in a photoelectrochemical system, which is assembled from a nickel foam covered with TiO2 modified by covalent ligands as photocathode and BiVO4 as photoanode. These photoelectrocatalytic cells generate mainly methanol as a product in the liquid phase. Our results show that imine-functionalized TiO2/Ni has the highest activity. The formation rate of methanol in this excellent cell is up to 153 mu M/h.cm(2), which is about 15 times higher than that of the TiO2/Ni electrode. If the Faradaic efficiency is considered as 100%, the light quantum efficiency of this cell reaches 1.2%, that is two times better than that of plants. Isotopic labeling experiments with (CO2)-C-13 confirm that the detected products are produced exclusively by the reduction of CO2 and water splitting. (C) 2017 Elsevier Inc. All rights reserved.
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