文献类型：期刊文献

英文题名：Crack evolution during the film drying process of fuel cell microporous layer ink

作者：Chen, Zhekun[1];Pan, Weitong[1];Yao, Dingsong[1];Gao, Ming[1];Gao, Yunfei[1];Chen, Xueli[1];Krzywanski, Jaroslaw[2];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Jan Dlugosz Univ Czestochowa, Czestochowa, Poland

年份：2022

卷号：650

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20222612297373);WOS:【SCI-EXPANDED(收录号:WOS:000830493800004)】；

基金：This work was supported by National Natural Science Foundation of China (22178114) .

语种：英文

外文关键词：Proton exchange membrane fuel cell; Microporous layer; Crack; Drying; Solvent composition

摘要：Study on the film crack formation process of microporous layer (MPL) in fuel cells is necessary as the size of cracks substantially affects fuel cell durability. In-situ characterization of crack evolution in the full MPL ink drying process is essential to understand the crack formation mechanism. In this work, quasi in-situ crack evolution in the full MPL ink drying process under different stages is comprehensively investigated using ESEM, PLM, and regular SEM. A crack formation with subsequent crack healing mechanisms is discovered. Physiochemical characterizations indicated that the crack formation process is related to the evaporation of isopropanol, whereas the crack healing process is related to the subsequent evaporation of water. Experiments on solvent composition further indicate that the final crack size depends on the ink dispersion during the drying process. Furthermore, the optimal 1/2 IPA/water weight ratio formulation is proposed for the resulting MPL with fewer cracks.