Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 34, Issue 7, Pages 735-749Publisher
SPRINGER
DOI: 10.1023/B:JACH.0000031161.26544.6a
Keywords
doped Raney Ni electrodes; electrochemical impedance modeling; hydrogen evolution reaction; intrinsic activity
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The hydrogen evolution reaction was studied in 1 M KOH at 25degreesC on two types of electrodes: (i) pressed powders of Ni or NiMo with Al, heated at 700degreesC; (ii) Ni-Al-Mo powders deposited by vacuum plasma spraying. These materials were treated with alkaline solution to leach out aluminum. Very active and stable Raney nickel molybdenum electrodes were obtained from Al rich alloys. Adding molybdenum significantly improved catalytic activity. Electrochemical impedance spectroscopy was used to determine the apparent and intrinsic activities. Different ac models were tested and the appropriate one was selected. Intrinsic activities of these electrodes are smaller or equal to that of polycrystalline Ni and the origin of high apparent activities is related to the increase in real surface area.
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