정전분무법을 이용한 직접개미산 연료전지 전극촉매의 효율적인 분산
Effective Dispersion of Electrode Catalysts for Direct Formic Acid Fuel Cells by Electrospray Method
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초록
직접개미산 연료전지의 전극 촉매로 사용되는 귀금속 백금-루테늄 촉매를 정전분무법을 이용하여 효 율적으로 분산하여 보았다. 전극에 도포된 촉매 양은 분사 시간에 따라 증가하였으나, 분사시간이 80분을 넘는 경우 촉매 응집으로 인하여 연료전지 성능은 감소하는 경향을 보였다. 상용 핸드스프레 이로 전극 촉매를 3.0 mg/cm2 분산한 경우 얻은 최대 출력밀도 74 mW/cm2와 비교하여 정전분무 법은 적은 양인 1.85 mg/cm2의 촉매를 분산하고도 72 mW/cm2의 최대 출력밀도를 얻을 수 있었다
Abstract
Effective dispersion of noble metal Pt-Ru catalysts was conducted for the application of direct formic acid fuel cell(DFAFC) electrodes by electrospray method. The amount of catalysts deposited on the electrodes increased with increasing deposition time. However, the performance of cell test decreased with the deposition time after 80 min. because of agglomeration of catalysts. With the conventional hand-spray method, the density of the anode catalysts deposited was 3.0 mg/cm2 and the maximum power density of the MEA was 74mW/cm2. On the other hand, the MEA prepared by the electrospray method, showed a similar power density of 72 mW/cm2. However, the density of the anode catalysts deposited was much lower than the case of the hand-spray and the density the anode catalysts in this case was 1.85 mg/cm2
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