Gas Diffusion Layer with Various Hydrophobic Properties Effect on Alkaline Anion Exchange Membrane Fuel Cells

• Main Authors: Yu-Wei Ke, 柯煜偉
• Other Authors: Hsi-Harng Yang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/45c9fh

碩士 === 國立中興大學 === 精密工程學系所 === 106 === In this study, the water management in alkaline anion exchange membrane fuel cells (AEMFC) by testing six kinds of carbon materials was studied, which are GDL 120, GDL120+30% PTFE, GDS310, GDS310+30% PTFE, GDL340, and GDL340+30% PTFE, respectively. The Pt/C of 0.8 mg/cm2 and with different ratios component were prepared for two catalysts as the cathode and anode electrode. In addition, the prepared Pt/C catalysts were coated on the carbon materials surface for Scanning electron microscope (SEM) testing to measure the surface and proved the Pt/C attached to the black carbon status. Then, the surface tension measuring instrument was used to measure the contact angle of each carbon material and determined the hydrophilicity/hydrophobicity of the material for further discussion of the AEMFC water management. For double verification, anion exchange membranes at different thicknesses were used to test the fuel cell discharge experiment. The results showed that one of the anode or cathode without adding hydrophobic material PTFE will cause water clogged so that the inlet gas could not smoothly pass through the electrodes and then the AEMFC performance was declined. Using hydrophobic carbon material GDL340+30% PTFE at the anode and cathode showed a better ion conductivity without flooding phenomenon. Moreover, The AEMFC with the GDL340+30% PTFE used for both anode and cathode and the FAA-3-PK-75 membrane can achieve an optimal power density of 82mW/cm2 at 0.4V whereas the AEMFC discharge test with the same types of the anode and cathode, but the other thinner FAS-30 membrane obtained a significantly high power density of 279 mW/cm2 at 0.4 V.