Operando 3D Visualization of Migration and Degradation of a Platinum Cathode Catalyst in a Polymer Electrolyte Fuel Cell.
Hirosuke MatsuiNozomu IshiguroTomoya UrugaOki SekizawaKotaro HigashiNaoyuki MaejimaMizuki TadaPublished in: Angewandte Chemie (International ed. in English) (2017)
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.
Keyphrases
- reduced graphene oxide
- ionic liquid
- ion batteries
- computed tomography
- single cell
- room temperature
- high resolution
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- cell therapy
- dual energy
- gold nanoparticles
- solar cells
- magnetic resonance imaging
- carbon dioxide
- visible light
- metal organic framework
- positron emission tomography
- solid state
- contrast enhanced
- stem cells
- optical coherence tomography
- image quality
- bone marrow
- fluorescence imaging
- pet ct
- electron microscopy