Electrochemical characterization of Raney nickel electrodes prepared by atmospheric plasma spraying for alkaline water electrolysis

Ji Eun Kim, Ki Kwang Bae, Chu Sik Park, Seong Uk Jeong, Kyeong Ho Baik, Jeong Won Kim, Kyoung Soo Kang, Ki Bong Lee, Young Ho Kim

Research output: Contribution to journalArticle

Abstract

A Raney Ni electrode was prepared by the simple and economical atmospheric plasma spraying method. It showed excellent performance for hydrogen evolution reaction (HER), as indicated by a Tafel slope of 54 mV/dec and overvoltage of 108 mV at 300 mA/cm2. The Ni–Al alloy coating contained a NiAl phase, which has a very slow Al leaching rate in alkaline solution. H2 heat treatment of the electrode enhanced the uniformity of Al distribution in the coating and adhesion of the coating to the substrate. However, the HER performance did not improve and the electrode was rendered more structurally vulnerable to deactivation.

Original languageEnglish
Pages (from-to)160-168
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume70
DOIs
Publication statusPublished - 2019 Feb 25

    Fingerprint

Keywords

  • Alkaline electrolysis
  • Atmospheric plasma spraying
  • Electrode deactivation
  • Hydrogen evolution reaction
  • Raney nickel
  • Water electrolysis

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this