산화안정성 향상을 위한 고분자연료전지용 탄화수소복합막의 제조 및 특성연구
Hydrocarbon Composite Membranes with Improved Oxidative Stability for PEMFC
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양성자교환막연료전지에서 사용할 탄화수소계 전해질 막 (술폰산화 폴리아릴렌에테르설폰)의 산화안정성을 향상시키기 위하여 세륨이온이 도입된 전해질 복합막을 제조하였다. 세륨이온의 함유 농도에따른 산화안정성의 변화를 관찰하였고, 함수율 및 수소이온전도도에 미치는 영향을 조사하였다. ICP분석을 통해 세륨이온의 함침여부를 검증하였고, NMR 피크의 화학적 이동으로 금속이온과 술폰산그룹과의 배위여부를 확인하였다. 세륨이온의 함량이 증가함에 따라 이온전도도 및 함수율은 감소하였으나, 산화안정성은 향상되었다. 특히, 과산화수소폭로 가속화장치를 이용하여, 기존의 펜톤산화실험에 비해 실제 연료전지운전과 매우 유사한 조건에서 전해질 막의 산화안정성을 평가하였다
Abstract
Sulfonated poly(arylene ether sulfone)-cerium composite membranes with improved oxidativestability were prepared for proton exchange membrane fuel cell application. Oxidative stabilityof the composite membranes changed depending on the amount of incorporated metal. Theirwater uptake, IEC and proton conductivity were also affected. ICP analysis confirmed trace ofcerium ion in the composite membranes and 1H-NMR indicated successful coordination of sulfonicacid groups with the metal ions. Increasing amount of the cerium ion resulted in decrease in protonconductivities and water uptake, but enhanced oxidative stabilities. A hydrogen peroxide exposureequipment was used for the test of oxidative stability of the composite membranes, which enabledto mimic fuel cell operating condition compared with conventional Fenton’s test
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