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HWAHAK KONGHAK,
Vol.35, No.3, 433-439, 1997
Vol.35, No.3, 433-439, 1997
활성탄소섬유 사용에 의한 인산형 연료전지 산소전극의 성능 향상
Enhancement of Cathode Performance of PAFC by Using Activated Carbon Fiber
비표면적이 큰 활성탄소섬유(ACF)를 기존의 전극 구성재인 카본블랙과 혼합하여 인산형 연료전지의 전극으로 제조하였으며, 제조된 각 전극의 성능을 190 ℃, 100 % 인산 전해질하에서 반쪽 전지 실험을 통하여 측정하였다. 활성탄소섬유에 담지된 백금 입자는 30 Å 이하로 고분산되어 반응표면적을 증가시켰다. 백금이 담지된 카본브랙에 대한 활성탄소섬유의 질량비가 30 % 일 때 전극성능은 700 ㎷에서 928 ㎃/㎠를 나타내었으며, Tafel slope은 123 ㎷/decade로 카본블랙만으로 구성된 전극의 145 ㎷/decade와 비교해 볼 때 향상된 전극특성을 나타내었다.
The electrodes for phosphoric acid fuel cell were fabricated from the mixture of activated carbon fiber(ACF) and carbon black as an existing electrode constituent. The performance of the electrode was measured through a half cell at 190 ℃, 100 % phosphoric acid electrolyte. Pt particles loaded on ACF were highly distributed below 30 Å, which increased reaction surface area. When the ratio of ACF to carbon black was 30 %, the electrode performance showed the value of 928 ㎃/㎠ at 700 ㎷ and the Tafel slope of 123 ㎷/decade, which proved the enhanced electrode characteristics in comparison with 145 ㎷/decade of the electrode composed of carbon black only.
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