고분자전해질 연료전지용 캐소드 촉매로서 화학환원법을 이용하여 20% Pt/C 제조하고 다양한 온도($300-600^{circ}C$)열처리하여 산소환원반응을 평가하였다 $300-400^{circ}C$에서 열처리한 20% Pt/C가 높은 산소환원반응 활성을 나타냈으며, 특히 $300^{circ}C$에서 열처리한 촉매를 0.6V에서의 정전위를 측정한결과, 열처리하지 않은 촉매에 비해서 산소환원 반응 활성정도가 2배 높게 나타났다. TEM 및 XRD 분석을 이용하여 조사한 결과, 열처리 온도가 높아짐에 따라서 백금 입자 크기가 커지고 결정화도가 증가하는 것을 확인하였다. 이러한 결과에서 산소환원반응 활성을 위한 백금의 입자 크기와 결정화도가 $300^{circ}C$에서 최적화되는 것으로 판단된다.
The 20% Pt/C catalysts were synthesized using the chemical reduction method for polymer electrolyte fuel cell cathode and were heat-treated in the temperature range from 300 to $600^{circ}C$. The oxygen reduction reaction of the catalysts was evaluated using the electrochemical measurement. The oxygen reduction reaction of the heat-treated Pt/C at $300^{circ}C$ had high catalytic activity and the oxygen reduction reaction current of that was 2 times than that of non-heat treatment catalyst. It is considered that the change of the crystallinity and particle size by heat treatment could increase the catalytic activity.
