Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15639
Title: Electrochemical performance of porous Ni3Al electrodes for hydrogen evolution reaction
Authors: Dong, H
Lei, T
He, Y
Xu, N
Huang, B
Liu, CT
Issue Date: 2011
Source: International journal of hydrogen energy, 2011, v. 36, no. 19, p. 12112-12120
Abstract: Porous Ni3Al intermetallic material with a mean pore diameter of around 1 pm was prepared by step sintering Ni and Al powder pressed compacts in vacuum furnace at 900 degrees C. The electrocatalytic activity of the as-fabricated porous Ni3Al material as an electrode for hydrogen evolution reaction (HER) in alkaline solutions was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) techniques. It is found that the onset potential of porous Ni3Al for HER shifted in the positive direction favoring hydrogen generation with lower overpotential, compared with foam Ni and dense Ni electrodes. Effects of electrolyte concentration and temperature on HER as well as the electrochemical stability in alkaline solution were investigated and the electrochemical activation energy was determined for the porous Ni3Al. The increased activity for HER was attributed to the high porosity, an increased electrochemical surface area and the nanostructure of porous Ni3Al electrode. The corrosion tests showed that the corrosion resistance of porous Ni3Al electrode changed during the immersion process due to the formation of passive film layers.
Keywords: Porous Ni3Al intermetallics
Reactive synthesis
Hydrogen evolution reaction
Electrocatalytic activity
Electrolysis
Publisher: Pergamon Press
Journal: International journal of hydrogen energy 
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2011.06.115
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