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함침-환원법에 의한 고분자 전해질형 연료전지 막/전극 어셈블리의 제조 및 특성화
Characterization of Membrane/Electrode Assembly for Polymer Electrolyte Membrane Fuel Cell Fabricated by Impregnation-Reduction Method
HWAHAK KONGHAK, February 1997, 35(1), 21-28(8), NONE
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Abstract
고분자 전해질형 연료전지의 막/전극 어셈블리를 함침-환원법으로 제조하고, 그 제조 조건과 어셈블리의 구조가 전지의 성능에 미치는 영향을 단전지에서 살펴보았다. 본 실험에서 막/전극 어셈블리의 최적 제조 조건은 1mM Pt(NH3)4Cl2로 60분 동안 함침 후, 1mM NaOH4로 2시간 동안 환원한 경우이었다. 연료전지의 성능은 막 표면에 과도한 입자 성장 및 촉매층 형성이 일어나지 않도록 전극 구조를 만듦으로써 향상시킬 수 있었다. 교류 임피던스법으로부터 산소전극의 계면저항이 작을수록, 이중층 전기용량이 클수록 연료전지의 성능이 향상됨을 알 수 있었다.
Membrane/electrode assemblies for polymer electrolyte membrane fuel cell were fabricated by impregnation-reduction method, and effects of fabrication conditions and assembly structures on the cell performance were investigated in a single cell. The optimal fabrication condition of the membrane/electrode assembly was 1mM Pt(NH3)4Cl2 impregnation for 60minutes and 1mM NaOH4 reduction for 2 hours in this experiment. The fuel cell performance could be improved by making the electrode structure not to have large particle creation and thick catalyst layer formation on the membrane. The AC impedance measurement showed that high cell performance corresponded to low interfacial resistance of the oxygen electrode and to high double layer capacitance
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