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• W2090102793 abstract "Electrocatalytic CO2 reduction was carried out using a modified graphite electrode coated with a poly(4-vinylpyridine) (PVP) membrane containing cobalt phthalocyanine (CoPc). In a typical electrolysis in a 0.1 M NaH2PO4 aqueous phase (pH 4.4), the catalyst membrane achieved a much more selective CO2 reduction than that by a neat CoPc coating. The degree of the selectivity, defined as the ratio of CO to H2 produced, was about 6 at .20V vs. Ag¦AgCl. The catalytic activity of CoPc was ascribed to the properties of PVP which is co-ordinative and weakly basic. Important factors affecting the CO2 reduction were investigated, such as applied potential, pH and CoPc concentration in the membrane. An optimum applied potential of −1.20V vs. Ag¦AgCl was found for selective CO production. As for the pH, an optimum condition was obtained at pH ≈ 5 where the PVP provides a partially protonated environment around the CoPc. The CO/H2 selectivity was strongly dependent on the CoPc concentration in the membrane ([CoPc]PVP) especially at lower applied potentials; higher [CoPc]PVP brings about higher CO/H2 selectivity. As for the effects of PVP, coordination of the pyridine group to CoPc as well as the microenvironment around CoPc provided by the polymer were concluded as dominant factors. A concerted protonation-deprotonation mechanism for the CO production process assisted by partially protonated PVP species was suggested. From the voltammetric and in situ potential-step chronoamperospectroscopy measurement, it was proposed that the CoPc/CO2 intermediate accepts a third electron to produce CO." @default.
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• W2090102793 date "1996-08-01" @default.
• W2090102793 modified "2023-09-27" @default.
• W2090102793 title "Factors affecting selective electrocatalytic co2 reduction with cobalt phthalocyanine incorporated in a polyvinylpyridine membrane coated on a graphite electrode" @default.
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• W2090102793 doi "https://doi.org/10.1016/0022-0728(96)04631-1" @default.
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