| Issue |
HWAHAK KONGHAK,
Vol.38, No.1, 1-6, 2000
Vol.38, No.1, 1-6, 2000
전착법을 이용한 PEMFC용 전극제조
Fabrication of Electrodes for PEMFC using Electrodeposition
전착법을 이용하여 PEMFC용 저담지 백금촉매전극을 제조하고 단위전지의 성능을 측정하였다. 또한 직류전착과 펄스전착시 백금촉매의 분산도, 백금담지량 및 전착효율 등을 비교하여 회적의 전극제조법을 확립하였다. 전착법은 백금촉매의 입자크기를 15Å정도로 줄일수 있고 전극표면에만 촉매를 담지시킬 수 있어 촉매의 분산도를 증가시키고 비표면적을 향상시켰다. 펄스전착은 직류전착보다 전착효율과 분산도가 좋고 동일한 전하량에서 백금담지량을 증가시킬 수 있어 전극의 성능을 향상시킬수 있었다. 펄스전착으로 촉매의 핵을 생성시킨 후 직류전착으로 핵성장을 시킬 경우 펄스전착 전하량이 3C/㎠ 일 때 전류밀도 300mA/㎠ (0.7V)로 가장 좋은 전극성능을 보였다. 0.7V에서 백금촉매의 mass activity는 분산도가 가장 우수한 펄스전착 전하량 1.8C/㎠ 일 때 664W/g Pt으로 가장 큰 값을 보였다.
The low Pt loading electrodes for PEMFC were manufactured using electrudeposition and their cell performances were measured. Also an optimal electrode fabrication process was determined by comparing Pt dispersion, loading and electrodeposition efficiency in direct current and pulse electrodeposition. Electrodeposition could reduce Pt particle size about 15Å, and enhance dispersion and specific surface area of Pt because of impregnating catalyst on the surface of electrode. Pulse electrodeposition was better than direct current one in electrodeposition efficiency and Pt dispersion, and it could increase cell performance due to higher Pt loading at same total passed charge. The electrode, which was made by growing Pt mclei in direct current electrodeposition after creating Pt nuclei in pulse one at pulse charge of 3C/㎠, showed the best performance of 300mA/㎠ (0.7V). At 0.7V the electrode that Pt dispersion was highest and pulse charge was 1.8C/㎠ had the largest mass activity of 664 W/g Pt.
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