Surface layers in alkaline media: nickel hydrides on metallic nickel electrodes

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DOIResolve DOI: http://doi.org/10.1149/05031.0165ecst
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TypeArticle
Proceedings titleCorrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald
ECS Transactions
ConferencePRiME 2012: Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald, October 7-12, 2012, Honolulu, Hawaii
ISSN1938-5862
ISBN9781607684190
Volume50
Issue31
Pages165179; # of pages: 15
SubjectCathodic current density; Hydrogen evolution reactions; Hydrogen generations; Industrial conditions; Industrial feedstock; Potentiostatic polarization; Reversible hydrogen electrodes; Water electrolysis; Cathodes; Corrosion; Cyclic voltammetry; Hydrogen production; X ray diffraction
AbstractHydrogen generation by water electrolysis is a renewable method of producing fuel and industrial feedstock. Ni-based H2-evolution catalysts in alkaline media are low-cost alternatives to the noblemetal- based electrode materials used in acidic media. However, Ni cathodes show a significant decrease in their hydrogen evolution reaction (HER) activity after several hours of electrolysis. We consider the source of electrode deactivation on smooth metallic Ni electrodes by cyclic voltammetry (CV), galvanostatic and potentiostatic polarization, and X-ray diffraction (XRD). Below the reversible hydrogen electrode (RHE) potential, H atoms incorporate deep into the electrode material. Under industrial conditions, i.e., concentrated NaOH/KOH solutions and large cathodic current densities, α-NiHx and β-NiH x can form at the electrode surface. © The Electrochemical Society.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21270069
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Record identifier25b8957a-2a0b-45cd-8424-0e915c49ac54
Record created2013-12-18
Record modified2016-05-09
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