| Summary: | 碩士 === 元智大學 === 化學工程與材料科學學系 === 103 === Gas diffusion electrodes (GDEs) prepared with polybenzimidazole (PBI) and polytetrafluoroethylene (PTFE) polymer binders in their catalyst layers (CLs) were investigated to optimize the performance of phosphoric acid doped PBI-based high temperature proton exchange membrane fuel cells (HT-PEMFCs). The physical properties of the GDEs and binders are characterized by field-emission scanning electron microscope (FE-SEM) and high resolution transmission electron microscope (HRTEM), respectively. The electrochemical properties of the membrane electrode assembly (MEA) and the GDEs are evaluated and analyzed by single cell polarization curve and cyclic voltammetry (CV). The results showed that PTFE are more attractive as CL binders than conventional PBI binder. At ambient pressure and 180 ℃, the current density at 0.6 V is up to 596 mA cm-2 (PTFE GDE), with H2/O2 and a platinum loading of 0.5 mg cm-2 on these electrodes. In addition, effects of PTFE binder content, phosphoric acid impregnation, heat treatment time and heat treatment gas on the GDEs are investigated to determine the optimum performance of the single cell.
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