文献类型：期刊文献

英文题名：Revealing failure modes and effect of catalyst layer properties for PEM fuel cell cold start using an agglomerate model

作者：Yang, Liu[1];Cao, Chenxi[2];Gan, Quanquan[3,4];Pei, Hao[1];Zhang, Qi[1];Li, Ping[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Smart Mfg Energy Chem Proc, Minist Educ, Shanghai 200237, Peoples R China;[3]Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China;[4]Shanghai Shenli High Tech Co Ltd, Ind Dev Zone,Yuandong Rd, Shanghai 201401, Peoples R China

年份：2022

卷号：312

外文期刊名：APPLIED ENERGY

收录：;EI(收录号：20220911719122);WOS:【SCI-EXPANDED(收录号:WOS:000774180900009)】；

基金：Acknowledgements This work is supported by the National Key R&D Program of China (2018YFB0105603) , National Natural Science Fund for Distinguished Young Scholars (61725301, 61925305) , and the start-up grant of East China University of Science and Technology (SLH00212012) . We gratefully acknowledge the assistance of Dr. Bing Wang in using the computing facilities.

语种：英文

外文关键词：PEM fuel cell; Mathematical modeling; Cold start; Catalyst agglomerates; Failure mechanism

摘要：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.