Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Double-layered Polymer Electrolyte Membrane based on Sulfonated Poly(aryl ether sulfone)s for Direct Methanol Fuel Cells

직접 메탄올 연료전지용 술폰화 폴리아릴에테르술폰 이중층 고분자 전해질 막의 제조 및 특성

  • Hong, Young-Taik (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Ko, Ha-Na (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Park, Ji-Young (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Choi, Jun-Kyu (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Sang-Un (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Hyung-Joong (Department of Advanced Materials Engineering, Kongju National University)
  • 홍영택 (한국화학연구원 에너지소재연구센터) ;
  • 고하나 (한국화학연구원 에너지소재연구센터) ;
  • 박지영 (한국화학연구원 에너지소재연구센터) ;
  • 최준규 (한국화학연구원 에너지소재연구센터) ;
  • 김상언 (한국화학연구원 에너지소재연구센터) ;
  • 김형중 (공주대학교 신소재공학과)
  • Published : 2009.12.30
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Abstract

Double-layered polymer electrolyte membranes were prepared from two different sulfonated poly(aryl ether sulfone) copolymers by the two-step solution casting method for direct methanol fuel cells (DMFC). Sulfonation degrees were adjusted 10% (SPAES-10) and 50% (SPAES-50) by controlling monomer ratios, and the weight ratios of SPAES-10 copolymer were varied in the range of 5~20% to investigate the effect of thickness of coating layers on the membranes. Proton conducting layers were fabricated from SPAES-50 solutions of N-methyl-2-pyrrolidone (NMP) by a solution casting technique, and coating layers formed on the semiliquid surface of the conducting layer by pouring of SPAES-10-NMP solutions onto. It was found that double-layered polymer electrolyte membrane could significantly reduce the methanol crossover through the membrane and maintain high proton conductivities being comparable to single-layered SPAES-50 membrane. The maximum power density of membrane-electrolyte assembly (MEA) at the condition of $60^{\circ}C$ and 2 M methanol-air was $134.01\;mW/cm^2$ for the membrane prepared in the 5 wt-% of SPAES-10 copolymer, and it was corresponding to the 105.5% of the performance of the commercial Nafion 115 membrane.

친전자성 치환반응을 통하여 제조된 술폰화 단량체와 비(非)술폰화 단량체의 직접 중합법을 통하여 서로 다른 술폰화도를 나타내는 술폰화 폴리아릴에테르술폰 공중합체를 합성하고, 이들로부터 직접 메탄올 연료전지용 이중층(層) 고분자 전해질 막을 제조하였다. 우수한 이온 전도특성을 나타내는 술폰화도 50%의 공중합체를 사용하여 전해질 막의 모체(母體) 전도층을 제조하고, 이들의 한쪽 표면에 술폰화도 10%의 공중합체를 도포한 후 건조하여 낮은 메탄올 투과 특성의 코팅층을 형성시켰다. 도포되는 공중합체의 질량비를 5~20%로 조절함으로써 코팅 층 두께에 따른 전해질 막의 특성 변화를 고찰하였으며, 형성된 코팅 층을 막-전극 접합체의 음극 면에 접합시켜 운전 시 메탄올 연료와 직접 접촉하도록 하였다. 이중층 형성 공정을 통하여, 단일 전해질 막과 동등한 수준의 이온 전도 특성을 유지하면서도, 전해질 막을 통한 메탄올 투과 특성이 현저히 개선된 우수한 효율의 고분자 전해질 막 제조가 가능하였다. 작동 온도 $60^{\circ}C$, 2 M의 메탄올 공급 환경에서 수행된 연료 전지 성능 평가 결과, 막-전극 접합체 출력 밀도는 5%의 질량비에서 최대 $134.01\;mW/cm^2$였으며, 이로부터 상용 나피온 115 대비 105.5%의 향상된 성능 효율을 확인할 수 있었다.

Keywords

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