Hydrogen evolution characteristics of sputter-deposited Co-Mo, Co-Al and Co-Mo-Al alloy electrodes in NaOH solution

Toshio Aihara, Asahi Kawashima, Eiji Akiyama, Hiroki Habazaki, Katsuhiko Asami, Koji Hashimoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Binary Co-Mo and Co-Al, and ternary Co-Mo-Al alloy electrodes for hydrogen evolution were prepared by using sputter deposition on a nickel substrate with good adhesion. The hydrogen evolution reaction (HER) of these alloy electrodes in the deaerated 1 kmol·m-3 NaOH at 303 K is enhanced significantly compared with pure cobalt electrode. The effective surface area of these alloy electrodes estimated from ac impedance technique is largely increased by leaching of aluminum into alkaline solution. The electrocatalytic activity sequence is Co-Mo-Al>Co-Mo>Co-Al. The maximum activity is obtained for Co-10Mo-58Al alloy with a hydrogen overpotential as low as 110 mV at 103 A·m-2. The enhancement of HER is attributed to both the synergistic effect of alloy constituents and the large effective surface area.

Original languageEnglish
Pages (from-to)1017-1023
Number of pages7
JournalMaterials Transactions, JIM
Volume39
Issue number10
DOIs
Publication statusPublished - 1998 Oct

Keywords

  • Cobalt-aluminum
  • Cobalt-molybdenum
  • Cobalt-molybdenum-aluminum
  • Electrocatalyst
  • Hydrogen evolution
  • Sputter deposition

ASJC Scopus subject areas

  • Engineering(all)

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