文献类型：期刊文献

英文题名：Microstructure and macroscopic rheology of microporous layer nanoinks for PEM fuel cells

作者：Pan, Weitong[1];Chen, Zhekun[1];Yao, Dingsong[1];Chen, Xueli[1];Wang, Fuchen[1];Dai, Gance[2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2021

卷号：246

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20213410793453);WOS:【SCI-EXPANDED(收录号:WOS:000704401400011)】；

基金：This work was supported by National Natural Science Foundation of China (21776086), and Key Program for Outstanding PhD Candidate of East China University of Science and Technology.

语种：英文

外文关键词：Proton exchange membrane fuel cell; Microporous layer; Microstructure; Rheology; Carbon agglomerate; PTFE

摘要：The microporous layer (MPL) is of significance to the PEM fuel cell performance and durability through water management. It is essential to gain insights into the MPL nanoink, a critical state determining the resulting MPL porous structure and function. In this work, a comprehensive investigation of ink microstructure and rheology with different PTFE loadings and solvent compositions has been conducted from a theoretical and practical level. Two different CB/PTFE interaction modes (i.e., covering and bridging) were revealed and the latter dominates with increasing PTFE loading. It was found a PTFE loading of 30% produces homogeneous ink dispersion and best stability. Besides, larger aggregates were found with increased IPA/water ratio using cryo-SEM. Furthermore, rheological measurements revealed that less shear-thinning indicates stable inks. Combining the ink preparation and slot-die coating processes, an optimal formulation of 30% PTFE loading and 1/2 IPA/water weight ratio was proposed for a uniform ink dispersion. (c) 2021 Elsevier Ltd. All rights reserved.