Stable Acidic Water Oxidation with a Cobalt–Iron–Lead Oxide Catalyst Operating via a Cobalt-Selective Self-Healing Mechanism

Darcy Simondson, Manjunath Chatti, Shannon A. Bonke, Marc F. Tesch, Ronny Golnak, Jie Xiao, Dijon A. Hoogeveen, Pavel V. Cherepanov, James L. Gardiner, Antonio Tricoli, Douglas R. MacFarlane, Alexandr N. Simonov

Research output: Contribution to journalArticleResearchpeer-review

19 Citations (Scopus)

Abstract

The instability and expense of anodes for water electrolyzers with acidic electrolytes can be overcome through the implementation of a cobalt-iron-lead oxide electrocatalyst, [Co–Fe–Pb]Ox, that is self-healing in the presence of dissolved metal precursors. However, the latter requirement is pernicious for the membrane and especially the cathode half-reaction since Pb2+ and Fe3+ precursors poison the state-of-the-art platinum H2 evolving catalyst. To address this, we demonstrate the invariably stable operation of [Co–Fe–Pb]Ox in acidic solutions through a cobalt-selective self-healing mechanism without the addition of Pb2+ and Fe3+ and investigate the kinetics of the process. Soft X-ray absorption spectroscopy reveals that low concentrations of Co2+ in the solution stabilize the catalytically active Co(Fe) sites. The highly promising performance of this system is showcased by steady water electrooxidation at 80±1 °C and 10 mA cm−2, using a flat electrode, at an overpotential of 0.56±0.01 V on a one-week timescale.

Original languageEnglish
Pages (from-to)15821-15826
Number of pages6
JournalAngewandte Chemie - International Edition
Volume60
Issue number29
DOIs
Publication statusPublished - 12 Jul 2021

Keywords

  • electrochemistry
  • electronic structure
  • heterogeneous catalysis
  • hydrogen
  • kinetics

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