Methanol electro-oxidation on a porous nanostructured Ni/Pd-Ni electrode in alkaline media

doi:10.1016/S1872-2067(12)60643-3

Abstract

Abstract:

A nanostructured Ni/Pd-Ni catalyst with high activity for methanol oxidation in alkaline solution was prepared by electrodeposition followed by galvanic replacement, that is, electrodeposition of Ni-Zn on a Ni coating with subsequent replacement of the Zn by Pd at the open circuit potential in a Pd-containing alkaline solution. The surface morphology and composition of the coatings were examined by energy dispersive X-ray spectroscopy and scanning electron microscopy. The Ni/Pd-Ni coatings were porous and were composed of discrete Pd nanoparticles of about 58 nm. The electrocatalytic activity of the Ni/Pd-Ni electrodes for the oxidation of methanol was examined by cyclic voltammetry and electrochemical impedance spectroscopy. The onset potentials for methanol oxidation on Ni/Pd-Ni were 0.077 V and 0.884 V, which were lower than those for flat Pd and smooth Ni electrodes, respectively. The anodic peak current densities of these electrodes were 4.33 and 8.34 times higher than those of flat Pd (58.4 mA/cm² vs 13.47 mA/cm²) and smooth Ni (58.4 mA/cm² vs 7 mA/cm²). The nanostructured Ni/Pd-Ni electrode is a promising catalyst for methanol oxidation in alkaline media for fuel cell application.

Key words: Methanol electro-oxidation, Palladium nanoparticle, Galvanic replacement, Cyclic voltammetry, Electrochemical impedance spectroscopy, Direct methanol fuel cell

Mir Ghasem Hosseini, Mehdi Abdolmaleki, Sajjad Ashrafpoor. Methanol electro-oxidation on a porous nanostructured Ni/Pd-Ni electrode in alkaline media[J]. Chinese Journal of Catalysis, 2013, 34(9): 1712-1719.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(12)60643-3

https://www.cjcatal.com/EN/Y2013/V34/I9/1712

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