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HWAHAK KONGHAK,
Vol.34, No.2, 188-193, 1996
Vol.34, No.2, 188-193, 1996
고분자 전해질형 연료전지에서 Nafion 함침량의 영향
Effect of Nafion Impregnation for a Proton Exchange Membrane Fuel Cell
고분자 전해질형 연료전지 전극에 Nafion 용액을 함침시켜 고분자막/전극 어셈블리를 만들고 그 성능을 단위전지에서 측정하였다. 또 단위전지의 교류 임피던스를 측정하여 고분자막/전극의 계면저항 및 촉매의 유효비표면적을 계산하고 이를 전지성능 실험결과와 비교하였다. 실험결과 1.9mg/cm2의 Nafion 함침 전극이 가장 높은 단위전지의 성능, 가장 넓은 촉매 유효비표면적 및 가장 작은 고분자막/전극의 계면저항을 보였다. 또한 운전 온도 및 압력 증가는 반응기체의 활성 및 농도의 증가로 인하여 단위전지 성능을 향상시켰다.
Membrane/electrode assemblies of proton exchange membrane fuel cell were prepared by impregnating Nafion solution in the electrodes and their performances were investigated in a single cell. The interfacial resistance of membrane/electrodes and the effective specific surface area of catalyst in the single cell were calculated from the AC impedance data and compared with the cell performance results. Experimental results showed that the electrode of 1.9mg/cm2 Nafion loading gave the highest single cell performance, the largest effective specific surface area of catalyst and the lowest interfacial resistance of membrane/electrode. The increase of operating temperature and pressure also improved the single cell performance due to the increment of activity and concentration of reaction gases.
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