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Keywords:

  • Nafion;
  • platinum;
  • water electrolysis;
  • X-ray photoelectron spectroscopy
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Chasing down the active state: Near-ambient-pressure X-ray photoelectron spectroscopy was used to study the surface of a Pt electrode during the oxygen evolution reaction (OER). A hydrated Pt metal phase with dissolved oxygen in the near-surface region is OER-active and considered to be the precursor of the analytically detected PtO2, which is in fact the deactivation product of the electrode.