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Electrochemical CO2 reduction catalysed by cobalt octacyanophthalocyanine and its mechanism

✍ Scribed by Toshiyuki Abe; Hiroshi Imaya; Tsukasa Yoshida; Sumio Tokita; Derck Schlettwein; Dieter Wöhrle; Masao Kaneko

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
237 KB
Volume
01
Category
Article
ISSN
1088-4246

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✦ Synopsis

Electrochemical CO 2 reduction was studied by using a graphite electrode coated with cobalt octacyanophthalocyanine (CoPc(CN) 8 ) and dipped in an aqueous phase. The most active and selective CO 2 reduction was achieved at -1.20 V (vs Ag/AgCl) with the ratio of the produced CO/H 2 around 10 at pH 9.3. The electrocatalytic CO 2 reduction by CoPc(CN) 8 could be achieved at a more positive applied potential than non-substituted CoPc (CoPc), which can be ascribed to the relatively positive redox potential of CoPc(CN) 8 . The catalytic mechanism of the CoPc(CN) 8 in a homogeneous system was investigated by an in situ potential-step chronoamperospectroscopy under argon and under CO 2 as well. In CoPc(CN) 8 the rate-determining step was an intermediate formation step, while in CoPc it was the second reduction of the complex.

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