Mechanical Behavior of Free-Standing Fuel Cell Electrodes on Water Surface

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Fundamental understanding of the mechanical behavior of polymer electrolyte fuel cell electrodes as free-standing materials is essential to develop mechanically robust fuel cells. However, this has been a significant challenge due to critical difficulties, such as separating the pristine electrode from the substrate without damage and precisely measuring the mechanical properties of the very fragile and thin electrodes. We report the mechanical behavior of free-standing fuel cell electrodes on the water surface through adopting an innovative ice-assisted separation method to separate the electrode from decal transfer film. It is found that doubling the ionomer content in electrodes increases not only the tensile stress at the break and the Young's modulus (E) of the electrodes by approximately 2.1-3.5 and 1.7-2.4 times, respectively, but also the elongation at the break by approximately 1.5-1.7 times, which indicates that stronger, stiffer, and tougher electrodes are attained with increasing ionomer content, which have been of significant interest in materials research fields. The scaling law relationship between Young's modulus and density (rho) has been unveiled as E similar to rho(1.6), and it is compared with other materials. These findings can be used to develop mechanically robust electrodes for fuel cell applications.
Publisher
AMER CHEMICAL SOC
Issue Date
2016-06
Language
English
Article Type
Article
Keywords

PROTON-EXCHANGE MEMBRANE; CATALYST LAYER; IONOMER CONTENT; NAFION CONTENT; PERFORMANCE; DEGRADATION; PLATINUM; MICROSTRUCTURE; TEMPERATURE; DEPENDENCE

Citation

ACS APPLIED MATERIALS & INTERFACES, v.8, no.24, pp.15391 - 15398

ISSN
1944-8244
DOI
10.1021/acsami.6b03854
URI
http://hdl.handle.net/10203/212285
Appears in Collection
ME-Journal Papers(저널논문)
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