Operando 3D Visualization of Migration and Degradation of a Platinum Cathode Catalyst in a Polymer Electrolyte Fuel Cell

Hirosuke Matsui, Nozomu Ishiguro, Tomoya Uruga, Oki Sekizawa, Kotaro Higashi, Naoyuki Maejima, Mizuki Tada

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The three-dimensional (3D) distribution and oxidation state of a Pt cathode catalyst in a practical membrane electrode assembly (MEA) were visualized in a practical polymer electrolyte fuel cell (PEFC) under fuel-cell operating conditions. Operando 3D computed-tomography imaging with X-ray absorption near edge structure (XANES) spectroscopy (CT-XANES) clearly revealed the heterogeneous migration and degradation of Pt cathode catalyst in an MEA during accelerated degradation test (ADT) of PEFC. The degradative Pt migration proceeded over the entire cathode catalyst layer and spread to MEA depth direction into the Nafion membrane.

Original languageEnglish
Pages (from-to)9371-9375
Number of pages5
JournalAngewandte Chemie - International Edition
Volume56
Issue number32
DOIs
Publication statusPublished - 2017 Aug 1
Externally publishedYes

Keywords

  • Pt cathode catalyst
  • XANES imaging
  • catalyst degradation
  • computed tomography
  • polymer electrolyte fuel cell

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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