Abstract
In this work, two types of carbon - Vulcan XC-72R, and vapor-grown carbon fiber (VGCF, 7μm in length and 100 nm in diameter) were investigated as materials composing a micro porous layer (MPL). These carbon materials were either sprayed or doctor bladed on commercial carbon paper (GDS 340, CeTech Co., Ltd., Taiwan) to form an MPL with various carbon loadings and various polytetrafluoroethene (PTFE) contain ratio. All of the home-made GDLs were assembly with commercial catalyst coated membranes (CCMs, General Optics Corp., Taiwan) for fuel cell performance test. All of the membrane electrode assembly (MEA) samples were investigated by the polarization curve and Electrochemical Impedance Spectroscopy (EIS).
Highlights
Due to their high power density, high efficiency, nonexistent emissions, high-quality power, scalability, and fast start-up, proton exchange membrane fuel cells (PEMFCs) are a promising future power source [1,2,3,4]
An membrane electrode assembly (MEA) is composed of two gas diffusion layers (GDLs), two catalyst layers, and a proton exchange membrane (PEM)
The optimal FEP content ratio was 30 and 50 wt% for microporous layer (MPL) fabricated by screen printing and spraying, respectively, and the two optimized MPLs performed at similar levels
Summary
Due to their high power density, high efficiency, nonexistent emissions, high-quality power, scalability, and fast start-up, proton exchange membrane fuel cells (PEMFCs) are a promising future power source [1,2,3,4]. Using air as the oxidant, the optimal FEP content ratio was 40 and 30 wt% for MPL fabricated by screen printing and spraying, respectively. The MPL fabricated by spraying showed lower fuel cell performance than screen printing, for both high and low FEP content ratios using air oxidant. The optimal FEP content ratio was 30 and 50 wt% for MPL fabricated by screen printing and spraying, respectively, and the two optimized MPLs performed at similar levels. These results by Yan et al [11] imply that an optimal FEP content ratio correlates with fuel cell operating conditions. A GDL with VGCF MPL could be high performance and low cost GDL
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