Evaluation of Raney nickel electrodes prepared by atmospheric plasma spraying for alkaline water electrolysers

Daniel Chade, Leonard Berlouis, David Infield, Andrew Cruden, Peter Nielsen, Troels Mathiesen

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The work describes the evaluation of Raney nickel electrodes prepared by the technique of atmospheric plasma spraying (APS). The APS Raney nickel layers of 30 mm, 100 mm and 300 mm thicknesses were characterised prior to and post-chemical activation by SEM. Following further electrochemical activation, the performance of these layers towards hydrogen evolution reaction (HER) were evaluated using potentiodynamic Tafel analysis and electrochemical impedance spectroscopy (EIS) in 30% KOH solutions over the temperature range 30 Ce80 C. Large surface area increases, in relation to smooth nickel, were obtained for these layers following activation and these were also confirmed from cyclic voltammetry measurements. The analysis of the data indicated that of the 3 thicknesses examined, the best electrocatalytic activity towards HER was obtained for 100 mm sample, with an efficiency (based on the Higher Heating Value for H2) equal to 96% at a current density of 300 mA cm2 and temperature of 70 C.
Original languageEnglish
Pages (from-to)14380-14390
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number34
Early online date2 Oct 2013
DOIs
Publication statusPublished - 2013

Keywords

  • Alkaline electrolyser
  • hydrogen
  • Raney nickel
  • renewable energy
  • electrocatalyst

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