Department of Chemistry, Graduate School of Science & Research Center for Materials Science (RCMS) & Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, Aichi, 464-8602, Japan.
RIKEN SPring-8 Center, Koto, Sayo, Hyogo, 679-5198, Japan.
Angew Chem Int Ed Engl. 2017 Aug 1;56(32):9371-9375. doi: 10.1002/anie.201703940. Epub 2017 Jul 6.
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.
在实际的聚合物电解质燃料电池（PEFC）中，在燃料电池操作条件下，可视化了实际膜电极组件（MEA）中 Pt 阴极催化剂的三维（3D）分布和氧化态。利用 X 射线吸收近边结构（XANES）光谱（CT-XANES）的 operando 3D 计算机断层扫描成像清楚地揭示了在 PEFC 的加速降解测试（ADT）期间，MEA 中 Pt 阴极催化剂的不均匀迁移和降解。退化的 Pt 迁移遍及整个阴极催化剂层，并扩散到MEA 深度方向进入 Nafion 膜。
