Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effect of Electrode Degradation on the Membrane Degradation in PEMFC

PEMFC에서 전극 열화가 전해질 막 열화에 미치는 영향

  • Song, Jinhoon (Department of Chemical Engineering, Sunchon National University) ;
  • Kim, Saehoon (HMC Eco Technology Research Institute) ;
  • Ahn, Byungki (HMC Eco Technology Research Institute) ;
  • Ko, Jaijoon (HMC Eco Technology Research Institute) ;
  • Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
  • 송진훈 (순천대학교 화학공학과) ;
  • 김세훈 (현대자동차 환경기술연구소) ;
  • 안병기 (현대자동차 환경기술연구소) ;
  • 고재준 (현대자동차 환경기술연구소) ;
  • 박권필 (순천대학교 화학공학과)
  • Received : 2012.09.22
  • Accepted : 2012.10.16
  • Published : 2013.02.01
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Abstract

Until a recent day, degradation of PEMFC MEA (membrane and electrode assembly) has been studied, separated with membrane degradation and electrode degradation, respectively. But membrane and electrode were degraded coincidentally at real PEMFC operation condition. During simultaneous degradation, there was interaction between membrane degradation and electrode degradation. The effect of electrode degradation on membrane degradation was studied in this work. We compared membrane degradation after electrode degradation and membrane degradation without electrode degradation. I-V performance, hydrogen crossover current, fluoride emission rate (FER), impedance and TEM were measured after and before degradation of MEA. Electrode degradation reduced active area of Pt catalyst, and then radical/$H_2O_2$ evolution rate decreased on Pt. Decrease of radical/$H_2O_2$ reduced the velocity of membrane degradation.

최근까지 대부분의 PEMFC MEA(Membrnae and Electrode Assembly) 열화 연구는 전극과 전해질 막 각각 분리되어 연구되었다. 그런데 실제 PEMFC 운전조건에서는 전극과 전해질 막은 동시에 열화된다. 동시열화과정에서 전극열화와 전해질 막 열화는 상호 작용한다. 본 연구에서는 전극열화가 전해질 막 열화에 미치는 영향에 대해 연구하였다. 전극 열화 후 전해질 막을 열화시켜 전극 열화없이 전해질 막을 열화시켰을 때와 비교하였다. 열화전후의 I-V 성능, 수소투과전류, 불소이온 유출 속도(FER), 순환 전압측정(CV), 임피던스, TEM 등을 측정하였다. 전극열화에 의해 백금촉매 활성 면적이 감소하고, 이에 따라 백금 상에서 라디칼/과산화수소 발생속도가 감소함으로써 막 열화속도가 감소함을 보였다.

Keywords

References

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