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인산형 연료전지에 관한 연구-다공성전극의 전기화학적 산소환원-
Studies on Phosphoric Acid Fuel Cell-Electrochemical Reduction of Oxygen on Porous Electrode-
HWAHAK KONGHAK, August 1990, 28(4), 395-402(8), NONE
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Abstract
인산형 연료전지용 다공성전극에 대한 전기화학적인 산소환원 특성을 고찰하였다. 테프론 양은 카본블랙 무게비로 환산하여 기체확산층은 40%, 촉매층에서는 30%인 때가 적당하였다. 기체확산층에 사용된 발포제인 탄산수소암모늄의 양은 카본블랙 무게비에 대하여 600%일 때가 좋았으며 이 때 다공율 60-65%, 평균구경 20-30㎛이었다. 촉매층의 카본블랙에 함침시킨 백금촉매의 최적량은 전극단위 면적당 0.5mg이었다. 이 조건에서 만든 전극의 산소환원 전류밀도는 0.7V(vs.NHE)에서 20mA/cm2를 나타냈다.
The electrochemical characteristics of oxygen reductkon of a porous electrode for phosphoric acid fuel cell have been studied. The best result for the manufacturing of fuel cell electrode was obtained when the amounts of PTFE contained in the catalytic layer and in the gas diffusion layer were 30% and 40%, respectively. The gas diffusion layer had the porosity of 60-65% and mean pore-diameter of 20-30㎛ when the foaming agent(ammonium bicarbonate)to the car-bon black was 600wt%. The optimum amount of platinum catalyst impregnated in carbon black was 0.5mg/cm2. At these conditions, cathode current density was 240mA/cm2 at 0.7V(vs. NHE).
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