Development of durable and efficient electrodes for large-scale alkaline water electrolysis

Cecilia Kristin Kjartansdóttir, Lars Pleth Nielsen, Per Møller

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A new type of electrodes for alkaline water electrolysis is produced by physical vapour depositing (PVD) of aluminium onto a nickel substrate. The PVD Al/Ni is heat-treated to facilitate alloy formation followed by a selective aluminium alkaline leaching. The obtained porous Ni surface is uniform and characterized by a unique interlayer adhesion, which is critical for industrial application. IR-compensated polarisation curves prepared in a half-cell setup with 1 M KOH electrolyte at room temperature reveals that at least 400 mV less potential is needed to decompose water into hydrogen and oxygen with the developed porous PVD Al/Ni electrodes as compared to solid nickel electrodes. High-resolution scanning electron microscope (HR-SEM) micrographs reveal Ni-electrode surfaces characterized by a large surface area with pores down to a few nanometre sizes. Durability tests were carried out in a commercially produced bipolar electrolyser stack. The developed electrodes showed stable behaviour under intermittent operation for over 9000 h indicating no serious deactivation in the density of active sites.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number20
Pages (from-to)8221-8231
ISSN0360-3199
DOIs
Publication statusPublished - 2013

Keywords

  • Alkaline water electrolysis
  • Hydrogen evolution reaction
  • High surface area porous Ni
  • Plasma vapour deposition
  • Al–Ni Thermo-Chemical diffusion
  • Aluminium leaching
  • Raney nickel

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