Abstract
Nickel-molybdenum and nickel-molybdenum-iron alloy coatings obtained from alkaline citrate bath on mild steel strips electrolytically have been characterized with a view to employ them as electrocatalytic cathodes to generate hydrogen by alkaline water electrolysis. A detailed investigation on the i- E behaviour, the stability under open circuit conditions, the tolerance to electrochemical corrosion and the long-term stability was carried out. The salient features of the coatings such as the physical characteristics, the chemical compositions, the crystal structure of the phases and the varying effects of a catalytic activation method were analysed with a view to correlate the microstructural characteristics of the coatings with the hydrogen adsorption process. The pathway of hydrogen evolution reaction on these alloy coatings was discussed, keeping in view the very low apparent activation energy values obtained experimentally.
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