Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

The Ni–Zn binary coating was electrochemically deposited on a copper electrode. Then, it was etched in a concentrated alkaline solution (30 wt% NaOH) to obtain a porous electrocatalytic surface suitable for methanol electro-oxidation in alkaline solution. The surface compositions of coatings before...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2012-03, Vol.42 (3), p.153-162
Main Authors: Hosseini, Mir Ghasem, Abdolmaleki, Mehdi, Ashrafpoor, Sajjad
Format: Article
Language:English
Subjects:
Alkaline leaching
Chemistry
Chemistry and Materials Science
Coatings
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Industrial Chemistry/Chemical Engineering
Methyl alcohol
Nickel
Original Paper
Physical Chemistry
Surface chemistry
Voltammetry
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Summary:The Ni–Zn binary coating was electrochemically deposited on a copper electrode. Then, it was etched in a concentrated alkaline solution (30 wt% NaOH) to obtain a porous electrocatalytic surface suitable for methanol electro-oxidation in alkaline solution. The surface compositions of coatings before and after alkaline leaching were determined by atomic absorption spectroscopy and energy dispersive X-ray analysis. The surface morphologies were investigated by scanning electron microscopy. It was found that the leached Ni–Zn coating has a porous structure. Electrocatalytic activity toward the methanol electro-oxidation was assessed by cyclic voltammetry and electrochemical impedance spectroscopy techniques. The activation of electrode related to the removal of existing corrosion products and formation of pores and cracks during alkaline leaching. Cyclic voltammetry studies confirmed that the alkaline leaching process improved the activity of Ni–Zn coating in comparison with smooth Ni deposit for the methanol electro-oxidation.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-012-0382-8