Electrochemical impedance spectroscopic investigation of CO2 reduction on polyaniline in methanol |
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Authors: | Fatih Kö leli,Thorsten Rö pke |
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Affiliation: | a Department of Chemistry, Faculty of Arts and Sciences, Mersin University, 33342 Mersin, Turkey b Angewandte Physikalische Chemie, Universität Oldenburg, Postfach 2503, 26111 Oldenburg, Germany |
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Abstract: | The ac response of polyaniline thin films on platinum electrodes was measured at different dc potentials during the CO2 reduction in methanol/LiClO4 electrolyte with a small amount of 0.5 M H2SO4. The complex capacitance curves were simulated and the data obtained were used to calculate kinetic parameters, based on the assumption that the thermodynamic potential E0 is in the region of −0.2-−0.1 V versus saturated calomel electrode (SCE). With E0=−0.2 V versus SCE and β=0.6, a j0 value of ca. 10−4 A cm−2 was found for the electroreduction of CO2 on the polyaniline electrode. |
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Keywords: | Polyaniline CO2 reduction Had formation HCOOH and CH3COOH formation Electrochemical impedance spectroscopy (EIS) |
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