期刊
APPLIED ENERGY
卷 312, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2022.118792
关键词
PEM fuel cell; Mathematical modeling; Cold start; Catalyst agglomerates; Failure mechanism
资金
- National Key R&D Program of China [2018YFB0105603]
- National Natural Science Fund for Distinguished Young Scholars [61725301, 61925305]
- East China University of Science and Technology [SLH00212012]
A dynamic model is proposed to study the cold start process of proton exchange membrane fuel cell. The competition between reactant concentrations and electro-catalytic surface within catalyst agglomerates leads to different failure modes at different start-up current densities. Additionally, the thickness of the cathode catalyst layer and the ionomer to carbon ratio have significant effects on the critical ice fraction.
We propose a dynamic model for cold start of proton exchange membrane fuel cell in account for transport, phase-change and electrochemical reactions within catalyst agglomerates. The competition between loss of in agglomerate reactant concentrations and active electro-catalytic surface is shown to cause different failure modes dependent on start-up current densities. Critical ice fractions of failure were identified for different cathode catalyst layer (CL) thickness and ionomer to carbon ratios (I/C) at 0.4 A cm(-2). In contrast to thicker CLs that uplift the critical ice fraction, larger I/Cs decrease the CL porosity and agglomerate pore size, thus significantly reducing the critical ice fraction. Moreover, by utilizing the electro-osmotic drag effect, slightly thickening anode CLs provides effective internal heat source during cold start at high current densities with minimal impact on the nominal cell performance.
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