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Issue 6, 2019
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Electrocatalytic reduction of low concentration CO2

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Abstract

Utilization of low concentration CO2 contained in the exhaust gases from various industries and thermal power stations without the need for energy-consuming concentration processes should be an important technology for solving global warming and the shortage of fossil resources. Here we report the direct electrocatalytic reduction of low concentration CO2 by a Re(I)-complex catalyst that possesses CO2-capturing ability in the presence of triethanolamine. The reaction rate and faradaic efficiency of CO2 reduction were almost the same when using Ar gas containing 10% CO2 or when using pure CO2 gas, and the selectivity of CO formation was very high (98% at 10% CO2). At a concentration of 1% CO2, the Re(I) complex still behaved as a good electrocatalyst; 94% selectivity of CO formation and 85% faradaic efficiency were achieved, and the rate of CO formation was 67% compared to that when using pure CO2 gas. The electrocatalysis was due to the efficient insertion of CO2 into the Re(I)–O bond in fac-[Re(dmb)(CO)3{OC2H4N(C2H4OH)2}] (dmb = 4,4′-dimethyl-2,2′-bipyridine).

Graphical abstract: Electrocatalytic reduction of low concentration CO2

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Publication details

The article was received on 17 Sep 2018, accepted on 11 Nov 2018 and first published on 12 Nov 2018


Article type: Edge Article
DOI: 10.1039/C8SC04124E
Citation: Chem. Sci., 2019,10, 1597-1606
  • Open access: Creative Commons BY-NC license
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    Electrocatalytic reduction of low concentration CO2

    H. Kumagai, T. Nishikawa, H. Koizumi, T. Yatsu, G. Sahara, Y. Yamazaki, Y. Tamaki and O. Ishitani, Chem. Sci., 2019, 10, 1597
    DOI: 10.1039/C8SC04124E

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