Article ID Journal Published Year Pages File Type
187716 Electrochimica Acta 2013 5 Pages PDF
Abstract

Hydrogen evolution reaction was investigated in 0.50 M Na2SO4 + 0.10 M 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.

Graphical abstractPorous nickel electrode was obtained by leaching out zeolite particles from nickel/zeolite electrode. HER potential of the porous Ni electrode (d) moved positively about 310 mV compared to Niac electrode (a) at current density of 20 mA cm−2.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► HER behavior was compared on four types of nickel-based electrodes. ► Porous Ni electrode was obtained by leaching out zeolite from NiZE electrode. ► Porous Ni electrode showed the smallest charge-transfer impedance in four electrodes. ► Porous Ni electrode showed the highest exchange current density in four electrodes. ► Porous Ni electrode showed the highest electrocatalytic activity in four electrodes.

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