Citation: Tayebe Rostami, Majid Jafarian, Somaieh Miandari, Mohammad G. Mahjani, Fereydoon Gobal. Synergistic effect of cobalt and copper on a nickel-based modified graphite electrode during methanol electro-oxidation in NaOH solution[J]. Chinese Journal of Catalysis, ;2015, 36(11): 1867-1874. doi: 10.1016/S1872-2067(15)60959-7 shu

Synergistic effect of cobalt and copper on a nickel-based modified graphite electrode during methanol electro-oxidation in NaOH solution

1.
a Department of Chemistry, K. N. Toosi University of Technology, Tehran, Iran;

Corresponding author: Majid Jafarian,
Received Date: 25 May 2015
Available Online: 30 July 2015

The electrocatalytic oxidation of methanol was studied over Ni, Co and Cu binary or ternary alloys on graphite electrodes in a NaOH solution (0.1 mol/L). The catalysts were prepared by cycling the graphite electrode in solutions containing Ni, Cu and Co ions at cathodic potentials. The synergistic effects and catalytic activity of the modified electrodes were investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). It was found that, in the presence of methanol, the modified Ni-based ternary alloy electrode (G/NiCuCo) exhibited a significantly higher response for methanol oxidation compared to the other samples. The anodic peak currents showed a linear dependency on the square root of the scan rate, which is a characteristic of a diffusion controlled process. During CA studies, the reaction exhibited Cottrellin behavior and the diffusion coefficient of methanol was determined to be 6.25×10^-6 cm²/s and the catalytic rate constant, K, for methanol oxidation was found to be 40×10⁷ cm³/(mol·s). EIS was used to investigate the catalytic oxidation of methanol on the surface of the modified electrode.
- Methanol electro-oxidation,
- Electrocatalysis,
- Synergistic effect,
- Nickel,
- Modified electrode
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