| Summary: | 碩士 === 元智大學 === 機械工程學系 === 100 === Membrane electrode assembly (MEA) is essential in the fuel cell system. The purpose of the gas diffusion layer (GDL) was to conduct electrons and gas transport; it also plays an important role on the fuel cell performance and water management. In general, the gas diffusion layer contains a gas diffusion subtract made of carbon paper or carbon cloth and a micro-porous layer (MPL). Current references in GDL research focuses on the materials, for example carbon black, and additives such as hydrophilic, hydrophobic, and pore-forming agents within the MPL.
In this study, four types of carbon: Vulcan XC-72R, BP-2000, long-vapor grown carbon nanotubes (LVGCNT, 7 um, ψ100 nm) and short-VGCNT (SVGCNT, 3 um, ψ100 nm) was tested as potential materials for the MPL. Each carbon was sprayed on carbon paper as MPL and with various carbon loading from 0.5 ~ 3.0 mg cm-2. The physical properties such as through-plane resistance and gas permeability, etc. were measured. After physical property tests, the best carbon loading from the above four types of carbons was chosen for further fuel cell performance testing. The improved performance of SVGCNT and LVGCNT compared to traditional used carbon powder- XC-72R primarily come from the low mass transfer resistance.
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