Premium
Operando 3D Visualization of Migration and Degradation of a Platinum Cathode Catalyst in a Polymer Electrolyte Fuel Cell
Author(s) -
Matsui Hirosuke,
Ishiguro Nozomu,
Uruga Tomoya,
Sekizawa Oki,
Higashi Kotaro,
Maejima Naoyuki,
Tada Mizuki
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201703940
Subject(s) - xanes , cathode , electrolyte , membrane electrode assembly , proton exchange membrane fuel cell , materials science , nafion , catalysis , platinum , polymer , chemical engineering , degradation (telecommunications) , membrane , electrode , chemistry , spectroscopy , electrochemistry , composite material , organic chemistry , telecommunications , biochemistry , physics , quantum mechanics , computer science , engineering
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.