Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effects of Ru/C Catalyst on the CO Tolerance of Anode and Durability of Membrane in PEMFC

PEMFC에서 전극의 CO 내성 및 막 내구성에 미치는 Ru/C 촉매의 영향

  • Sim, Woo-jong (Department of Chemical Engineering, Sunchon National University) ;
  • Kim, Dong-whan (Department of Chemical Engineering, Sunchon National University) ;
  • Choi, Seo-hee (Department of Chemical Engineering, Sunchon National University) ;
  • Kim, Ki-joong (Department of Chemical Engineering, Sunchon National University) ;
  • Ahn, Ho-Geun (Department of Chemical Engineering, Sunchon National University) ;
  • Jung, Min-chul (Department of Chemical Engineering, Sunchon National University) ;
  • Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
  • Received : 2007.10.02
  • Accepted : 2007.10.29
  • Published : 2008.04.30
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Abstract

Small amounts of CO in reformate fuel gas effectively block platinum catalysts by strong adsorption on the platinum surface at the operation temperature of $60{\sim}80^{\circ}C$ in PEMFC. To oxidate CO, Ru/C layer (CO filter) was placed between Pt/C layer and GDL (gas diffusion layer) in this study. Ru/C filter provided good CO-tolerant PEMFC anode, but decreased the performance of unit cell about 10% at 0.6 V due to mass transfer resistance from Ru/C filter thickness and increase of charge transfer resistance. Membrane degradation is one of the most important factors limiting the life-time of PEMFCs. Membrane durability would be dependent on the electrode catalyst type. It seemed that Ru catalyst layer would shorten the life time of PEMFC as enhanced the fluoride emission rate of membrane in acceleration test.

고분자전해질 연료전지는 $60{\sim}80^{\circ}C$ 운전 온도에서 개질 가스에 약간의 일산화탄소만 있어도 백금 표면에 CO가 강하게 흡착하여 촉매기능을 방해한다. 본 연구에서는 일산화탄소를 산화시키기 위해 Ru/C 층(CO 필터)을 Pt/C 층과 가스 확산층(GDL) 사이에 위치 시켰다. Ru/C 필터는 PEMFC anode가 좋은 CO 내성을 갖게 했으나 Ru/C 필터 두께로 인한 물질전달 저항과 전하 전달 저항증가에 의한 단위전지 성능저하가 0.6 V에서 약 10% 있었다. 고분자막의 열화는 PEMFC 수명을 단축시키는 주요 원인이 되고 있다. 막 내구성은 전극의 촉매 종류에 영향을 받을 수 있다. 가속실험결과 Ru/C 촉매가 불소유출 속도를 향상시킴을 보임으로써 Ru/C 촉매 첨가가 PEMFC 수명을 단축시킬 수 있음을 보였다.

Keywords

Acknowledgement

Supported by : 순천대학교

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