Micro-porous layer coating on gas diffusion layer in PEMFC

• Main Authors: Tai-Jiun Chiu, 邱太君
• Other Authors: Hsiu-Li Lin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/6538xa

碩士 === 元智大學 === 化學工程與材料科學學系 === 102 === In this study, carbon particles, carbon fiber (VGCF), and polytetrafluoroethylene (PTFE) were mixed with solvent to prepare a slurry, and then coated on the gas diffusion layer (GDL) surface by blade to form hydrophobic micro-porous layer (MPL). This hydrophobic micro-porous layer helps in delivering gas path and transporting electron charges, improves water management in fuel cell and enhances fuel cell performance. We prepare gas diffusion electrodes (GDEs) consisting of various thickness GDLs and different PTFE content (20 wt.%,.% 27.3 wt and 35 wt.%) of MPLs in several GDLs (carbon paper and carbon cloth) surface. Using a proton exchange membrane Nafion-212 and GDEs prepared in this work, we prepared membrane electrode assemblies (MEAs), anode and cathode catalyst ( Pt / C, Pt content 40 wt.%, Johnson Matthey) Pt loading was 0.2 mg cm-2 and 0.4 mg cm-2, respectively. PEMFC single cell tests were performed at 80 ℃ with 100% relative humidity both of H2/O2 and H2/air. When using carbon cloth with thickness of 360 μm as GDL, the MPL containing 35 wt.% PTFE on the GDL has a highest power density of 702 mW cm-2, which was larger than that of commercial gas diffusion layer (SGL, 10BC), i.e., a highest power density 609 mW cm-2.