Revealing the Surface Species Evolution on Low-loading Platinum in an Electrochemical Redox Reaction by Operando Ambient-Pressure X-ray Photoelectron Spectroscopy

Chueh Cheng Yang, Meng Hsuan Tsai, Zong Ren Yang, Yuan Chieh Tseng*, Chia Hsin Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The stability and activity of Platinum catalysts under the redox process are the key parameters affecting catalytic performance. Here, we investigated the surface species evolution of low-loading Pt catalyst deposited on a Nafion membrane through e-beam deposition during redox reactions by using in situ X-ray photoelectron spectroscopy (XPS) combined with a static electrochemical cell. Operando ambient-pressure XPS measurement revealed the oxide species (Ptδ+, Pt2+, and Pt4+) evolution over different potentials in the water layer constructed by an acid solution. The amount of Pt2+ increased with an increment of the anodic potential, whereas Pt4+ suddenly formed when the threshold voltage of the oxygen evolution reaction was crossed. Hysteresis of Pt2+ was revealed as Pt4+ was completely reduced when returning to the open circuit potential. Incorporating depth-profiling studies enabled us to uncover the mechanism of oxide species evolution between the surface and subsurface of the Pt catalyst during a redox reaction.

Original languageEnglish
JournalChemCatChem
DOIs
StateAccepted/In press - 2023

Keywords

  • APXPS
  • Membrane Electrode
  • Operando Surface Analysis
  • Oxygen Evolution Reaction
  • Platinum

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