Coupling effects of water content,temperature, oxygen density,and polytetrafluoroethylene loading on oxygen transport through ionomer thin film on platinum surface in catalyst layer of proton exchange membrane fuel cell |
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| Affiliation: | 1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;2. Zhejiang Light Industrial Products Inspection and Research Institute, Hangzhou, 310018, China;3. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China;4. Research Center of Engineering Thermophysics, North China Electric Power University, Beijing, 102206, China;5. Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, Tianjin, 300134, China;6. School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, China |
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| Abstract: | In this work, coupling effects of water content, temperature, oxygen density, and polytetrafluoroethylene (PTFE) loading on oxygen transport through an ionomer thin film on a platinum surface in a catalyst layer of a proton exchange membrane (PEM) fuel cell are investigated using molecular dynamics approach. Taguchi orthogonal algorithm is employed to comprehensively analyze the coupling effects in a limited number of cases. It is found that the effect of operation temperature is the weakest among the four factors, which has the smallest effect index 14.4. Coupling effects including the PTFE loadings on the oxygen transfer through the ionomer thin film is uncovered. Less PTFE loadings should be beneficial for the oxygen transfer. The chemical potential gradient is considered as the major driven force for the oxygen transport through the ionomer thin film, and oxygen density is the dominating factor, significantly affecting the chemical potential in the thin film. |
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| Keywords: | PEM fuel cell Ionomer thin film Oxygen transport resistance Molecular dynamics simulation Taguchi orthogonal algorithm |
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