新型炭材料2021，Vol.36Issue(2)：409-419,11.DOI:10.1016/S1872-5805(21)60017-3
一维炭材料一体式气体扩散层的制备及其在直接甲醇燃料电池中的应用
A novel gas diffusion layer and its application to direct methanol fuel cells
摘要
Abstract
The gas diffusion layer (GDL) is an important component of the membrane electrode assembly of fuel cells (FCs). Its roles include supporting the catalyst layer, collecting current, and transferring and redistributing materials. A conventional GDL con-sists of a backing layer, typically of commercial carbon paper or carbon cloth, but it suffers from its high cost, narrow pore-size dis-tribution, lack of flexibility and poor conductivity, and a micro-porous layer (MPL) is necessary for better gas/liquid management. A novel flexible gas diffusion layer (GDL) was prepared by vacuum filtration of a suspension of carbon fibers (CFs) and highly-dis-persed multi-wall carbon nanotubes (MWCNTs) in a polytetrafluoroethylene (PTFE) binder and water repellent. SEM observations, gas permeability and porosity tests indicate that there is a gradient in the concentration of highly-conductive MWCNTs in the CNT-CF GDL network that facilitates electron transport. A multi-level pore structure is formed, which is beneficial to mass transport. The PTFE is distributed uniformly, which is favorable for the discharge of condensed water from the FCs. When the GDL/CNT-CF is used in the cathode, or in both the cathode and anode in direct methanol FCs, the maximum power densities of single cells are in-creased by 20％ and 35％, respectively, compared with those using a commercial GDL consisting of carbon paper with a MPL due to its excellent mass transfer performance.关键词
气体扩散层/炭纤维/碳纳米管/多孔结构/直接甲醇燃料电池Key words
Gas diffusion layer/Carbon fibre/Multi-walled carbon nanotubes/Porous structure/Direct methanol fuel cell分类
化学化工引用本文复制引用
舒清柱,夏章讯,魏伟,许新龙,王素力,赵红,孙公权..一维炭材料一体式气体扩散层的制备及其在直接甲醇燃料电池中的应用[J].新型炭材料,2021,36(2):409-419,11.基金项目
This work is supported by the National Natural Science Foundation of China(Grant numbers:21506212,2150060681 and 21776027).国家自然科学基金(No.21506212,2150060681,21776027). （Grant numbers:21506212,2150060681 and 21776027）
