Electro-Catalytic Oxidation of Methanol on a Ni–Cu Alloy in Alkaline Medium |
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Authors: | M Jafarian RB Moghaddam MG Mahjani F Gobal |
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Affiliation: | (1) Department of Chemistry, K. N. Toosi University of Technology, 15875-4416, Tehran, Iran;(2) Faculty of Chemistry, Sharif University of Technology, 11365-9516, Tehran, Iran |
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Abstract: | The electro-catalytic oxidation of methanol on a Ni–Cu alloy (NCA) with atomic ratio of 60/40 having previously undergone 50 potential sweep cycles in the range 0–600 mV vs. (Ag/AgCl) in 1 m NaOH was studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (EIS). The electro-oxidation was observed as large anodic peaks both in the anodic and early stages of the cathodic direction of potential sweep around 420 mV vs. (Ag/AgCl). The electro-catalytic surface was at least an order of magnitude superior to a pure nickel electrode for methanol oxidation. The diffusion coefficient and apparent rate constant of methanol oxidation were found to be 2.16 × 10−4 cm2 s−1 and 1979.01 cm3 mol−1 s−1, respectively. EIS studies were employed to unveil the charge transfer rate as well as the electrical characteristics of the catalytic surface. For the electrochemical oxidation of methanol at 5.0 m concentration, charge transfer resistance of nearly 111 Ω was obtained while the resistance of the electro-catalyst layer was ca. 329 Ω. |
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Keywords: | electro-catalytic oxidation methanol nickel nickel– copper alloy |
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