Optimization of Electrolyte Membranes and Electrodes for High-Temperature PEMFCs
발표자
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초록
내용
Developing high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) that operate above 160°C is crucial for performance under high-temperature, anhydrous conditions. Nafion membranes lack thermal stability due to their low glass transition temperature (Tg). Hence, polybenzimidazole (PBI) membranes, known for their superior thermal stability, are preferred for HT-PEMFCs. This study focuses on optimizing electrolyte membranes for HT-PEMFCs, including commercial phosphoric acid-doped (PA) PBI membranes, recast PBI membranes, and commercial anion exchange membranes. The membranes were doped with PA by soaking them at 30°C for 2 days. Doping levels and conductivities were measured using a 4-point probe method over a temperature range of 140 to 200°C in 20°C intervals via impedance measurements. The performance of the membranes in membrane electrode assemblies (MEAs) was assessed through electrochemical analyses, providing a comprehensive evaluation of their electrochemical properties.