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Effect of catalyst layer mesoscopic pore-morphology on cold start process of PEM fuel cells

作     者:Ahmed Mohmed DAFALLA Fangming JIANG Ahmed Mohmed DAFALLA;Fangming JIANG

作者机构:Laboratory of Advanced Energy SystemsGuangdong Key Laboratory of New and Renewable Energy Research and DevelopmentCAS Key Laboratory of Renewable EnergyGuangzhou Institute of Energy ConversionChinese Academy of Sciences(CAS)Guangzhou 510640China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物:《Frontiers in Energy》 (能源前沿(英文版))

年 卷 期:2021年第15卷第2期

页      面:460-472页

核心收录:

学科分类:0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 

基  金:supported by the National Key Research and Development Project the Shanghai Automotive Industry Sci-Tech Development Foundation 

主  题:cold start energy conversion fuel cells mesoscale morphology tortuosity water management 

摘      要:Water transport is of paramount importance to the cold start of proton exchange membrane fuel cells(PEMFCs).Analysis of water transport in cathode catalyst layer(CCL)during cold start reveals the distinct characteristics from the normal temperature operation.This work studies the effect of CCL mesoscopic pore-morphology on PEMFC cold start.The CCL mesoscale morphology is characterized by two tortuosity factors of the ionomer network and pore structure,respectively.The simulation results demonstrate that the mesoscale morphology of CCL has a significant influence on the performance of PEMFC cold start.It was found that cold-starting of a cell with a CCL of less tortuous mesoscale morphology can succeed,whereas starting up a cell with a CCL of more tortuous mesoscale morphology may fail.The CCL of less tortuous pore structure reduces the water back diffusion resistance from the CCL to proton exchange membrane(PEM),thus enhancing the water storage in PEM,while reducing the tortuosity in ionomer network of CCL is found to enhance the water transport in and the water removal from CCL.For the sake of better cold start performance,novel preparation methods,which can create catalyst layers of larger size primary pores and less tortuous pore structure and ionomer network,are desirable.

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