Operando time-resolved x-ray absorption fine structure study for surface events on a Pt3Co/C cathode catalyst in a polymer electrolyte fuel cell during voltage-operating processes

Nozomu Ishiguro, Takahiro Saida, Tomoya Uruga, Shin Ichi Nagamatsu, Oki Sekizawa, Kiyofumi Nitta, Takashi Yamamoto, Shin Ichi Ohkoshi, Yasuhiro Iwasawa, Toshihiko Yokoyama, Mizuki Tada

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

The structural kinetics of surface events on a Pt3Co/C cathode catalyst in a polymer electrolyte fuel cell (PEFC) was investigated by operando time-resolved X-ray absorption fine structure (XAFS) with a time resolution of 500 ms. The rate constants of electrochemical reactions, the changes in charge density on Pt, and the changes in the local coordination structures of the Pt3Co alloy catalyst in the PEFC were successfully evaluated during fuel-cell voltage-operating processes. Significant time lags were observed between the electrochemical reactions and the structural changes in the Pt 3Co alloy catalyst. The rate constants of all the surface events on the Pt3Co/C catalyst were significantly higher than those on the Pt/C catalyst, suggesting the advantageous behaviors (cell performance and catalyst durability) on the Pt3Co alloy cathode catalyst.

Original languageEnglish
Pages (from-to)1319-1330
Number of pages12
JournalACS Catalysis
Volume2
Issue number7
DOIs
Publication statusPublished - 2012 Jul 6
Externally publishedYes

Keywords

  • PEFC
  • PtCo catalyst
  • fuel cell
  • operando XAFS
  • structural kinetics
  • time-resolved XAFS

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Fingerprint

Dive into the research topics of 'Operando time-resolved x-ray absorption fine structure study for surface events on a Pt<sub>3</sub>Co/C cathode catalyst in a polymer electrolyte fuel cell during voltage-operating processes'. Together they form a unique fingerprint.

Cite this