Journal
JOURNAL OF ELECTROCHEMICAL ENERGY CONVERSION AND STORAGE
Volume 19, Issue 2, Pages -Publisher
ASME
DOI: 10.1115/1.4053388
Keywords
electrochemical engineering; fuel cells
Categories
Funding
- JSPS Fellows
- Leadership Development Program for Ph.D. (LDPP) at the University of Tokyo
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Micropatterns applied to proton exchange membranes can improve the performance of polymer electrolyte fuel cells by increasing the reaction area for oxygen reduction. However, they also negatively affect gas diffusion and increase vulnerability to flooding. Comprehensive optimization of composition, geometry, and operating conditions is necessary for optimal performance.
Micropatterns applied to proton exchange membranes can improve the performance of polymer electrolyte fuel cells; however, the mechanism underlying this improvement is yet to be clarified. In this study, a patterned membrane electrode assembly (MEA) was compared with a flat one using electrochemical impedance spectroscopy and distribution of relaxation time analysis. The micropattern positively affects the oxygen reduction reaction by increasing the reaction area. However, simultaneously, the pattern negatively affects the gas diffusion because it lengthens the average oxygen transport path through the catalyst layer. In addition, the patterned MEA is more vulnerable to flooding, but performs better than the flat MEA in low-humidity conditions. Therefore, the composition, geometry, and operating conditions of the micropatterned MEA should be comprehensively optimized to achieve optimal performance.
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