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- W1626002805 abstract "Abstract The mass production of proton exchange membrane fuel cell (PEMFC) for stationary or mobile applications requires long‐term durability and minimization of the voltage loss observed upon operation. The extent of PEMFC performance degradation depends on the type of materials composing the membrane electrode assembly (MEA), their manufacturing technique, their structure, and the operating conditions of the cell. Recently, electron microscopy (EM) has become a technique of choice to achieve a better understanding of the physical/chemical origin of the MEA degradation as a function of operation time. Unlike most other physical, chemical, and electrochemical in situ or ex situ techniques (global techniques), EM enables the identification of local changes to the various components of the MEA. For example, defect formation at the micrometer scale in the proton exchange membrane (PEM) and the active layer (observed by scanning electron microscopy), change of porosity and redistribution of the electrocatalyst at the nanometer scale (observed by field‐emission gun scanning electron microscopy (FEG‐SEM) and transmission electron microscopy (TEM)), or structure/composition degradation of electrocatalyst nanoparticles at the atomic scale (observed by high‐resolution transmission electron microscopy (HRTEM)) can be derived from EM. A combination of the conclusions derived from local EM observations with those derived from other global characterization techniques yields the determination of MEA degradation mechanisms and provides some important routes to improve the PEM fuel cell performance and durability." @default.
- W1626002805 created "2016-06-24" @default.
- W1626002805 creator A5006094312 @default.
- W1626002805 creator A5035932055 @default.
- W1626002805 creator A5047512137 @default.
- W1626002805 date "2010-12-15" @default.
- W1626002805 modified "2023-10-16" @default.
- W1626002805 title "Electron microscopy to study membrane electrode assembly ( <scp>MEA</scp> ) materials and structure degradation" @default.
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