Abstract
Hydrogen evolution reaction was investigated in 0.50M Na2SO4+0.10M H2SO4 solution at room temperature on four types of nickel-based electrodes: (I) pure nickel electrode electrodeposited in acid solution (pH 4.0), (II) pure nickel electrode electrodeposited in ammoniacal solution (pH 9.0), (III) nickel/zeolite electrode co-deposited in ammoniacal solution containing zeolite particles and (IV) porous nickel electrode obtained by leaching out zeolite particles from nickel/zeolite electrode. The morphology and the microstructure of four types of electrodes were characterized by scanning electron microscopy and X-ray diffraction, and the electrocatalytic efficiency was evaluated based on steady-state polarization curves, Tafel plots and electrochemical impedance spectroscopy. It was shown that the electrocatalytic activity of as prepared electrodes depended on the morphology and the microstructure and, especially, the porous nickel electrode has the lowest charge transfer resistance, the highest exchange current density and electrocatalytic activity compared to the others for hydrogen evolution reaction.
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