Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation and Characterization of the $H_3PO_4$-doped Sulfonated Poly(aryl ether benzimidazole) Membrane for Polymer Electrolyte Membrane Fuel Cell

고분자전해질 연료전지용 인산 도핑 술폰화 폴리아릴에테르벤즈이미다졸 고분자전해질 막의 제조 및 특성

  • Hong, Young-Taik (Advanced Materials division, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Jeong, Jin-Ju (Advanced Materials division, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Yoon, Kyung-Sock (Advanced Materials division, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Choi, Jun-Kyu (Advanced Materials division, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Young-Jun (High Performance Organic Material Lab., Sungkyunkwan University)
  • 홍영택 (한국화학연구원 고분자나노소재연구팀) ;
  • 정진주 (한국화학연구원 고분자나노소재연구팀) ;
  • 윤경석 (한국화학연구원 고분자나노소재연구팀) ;
  • 최준규 (한국화학연구원 고분자나노소재연구팀) ;
  • 김영준 (성균관대학교 고성능유기재료연구실)
  • Published : 2006.12.31
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Abstract

Acid-doped sulfonated poly(aryl ether benzimidazole) (S-PAEBI) copolymers were synthesized by a direct polymerization technique and a doping with phosphoric acid as a dopant, and the polymer electrolyte membranes were fabricated from them by a solution casting method. To optimize the reaction condition, the degree of sulfonation and doping level were varied in the ranges of $0{\sim}60%\;and\;0.7{\sim}5.7$, respectively. Physiochemical properties of the doped membranes were investigated by AFM, TGA and the measurement of proton conductivity. It was found that proton conductivities depend on doping levels of membranes. Conductivity determined at the condition of $130^{\circ}C$ and no humidity was $7.3{\times}10^{-2}S/cm$ for the $H_3PO_4$-doped PAEBI membrane with a doping level of 5.7.

술폰화 폴리아릴에테르벤즈이미다졸 공중합체를 $K_2CO_3$를 이용한 직접중합법으로 합성하고 인산도핑을 하여 고온운전 연료전지용 고분자전해질 막을 제조하였다. 최적의 전해질 막 제조를 위하여 술폰화도 $0{\sim}60%$ 및 도핑을 $0.7{\sim}5.7$의 범위에서 다양한 조성의 전해질 막 제조실험이 수행되었으며, 원자현미경분석 및 열중량분석, 수소 이온 전도도측정 등을 통해 전해질 막의 기본특성들을 평가하였다. 수소 이온 전도도는 도핑율에 따라 증가하는 것으로 나타났으며, $130^{\circ}C$의 비 가습환경에서 측정된 수소 이온 전도도는 도핑을 5.7의 전해질 막에서 최대 $7.3{\times}10^{-2}S/cm$의 값을 나타내었다.

Keywords

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