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Synthesis and Characterization of Phosphoric Acid-doped Poly (2,5-benzimidazole) Membrane for High Temperature Polymer Electrolyte Membrane Fuel Cells

고온 고분자 연료전지용 인산 도핑 폴리(2,5-벤지이미다졸) 막의 제조 및 특성

  • Nguyen, Thi Xuan Hien (BIN Fusion Research Team, Dept. of Polymer & Nano Engineering, Chonbuk National University) ;
  • Mishra, Ananta Kumar (BIN Fusion Research Team, Dept. of Polymer & Nano Engineering, Chonbuk National University) ;
  • Choi, Ji-Sun (Fuel Cell Core Technology Research Center, Jeonbuk Technopark) ;
  • Kim, Nam-Hoon (Dept. of Hydrogen and Fuel Cell Engineering, Chonbuk National University) ;
  • Lee, Joong-Hee (BIN Fusion Research Team, Dept. of Polymer & Nano Engineering, Chonbuk National University)
  • Received : 2011.12.28
  • Accepted : 2012.02.24
  • Published : 2012.02.28

Abstract

Phosphoric acid-doped poly (2,5-benzimidazole) (DABPBI) was prepared by condensation polymerization of 3,4-diaminobenzoic acid for high temperature proton electrolyte membrane fuel cells. The membranes were casted directly using a hot-press unit and characterized by fourier transform infrared spectroscopy, thermogravimetric analysis, conductivity measurement, scanning electron microscopy and tensile test. The proton conductivities of DABPBI are observed to be 0.062 and 0.018 $S{\cdot}cm^{-1}$ under 30 and 1% relative humidity, respectively at a temperature of $120^{\circ}C$ which is appreciably higher than that of Nafion 115 under similar conditions. The DABPBI membrane has demonstrated excellent thermo- mechanical properties and proton conductivity suggesting its suitability as a high temperature membrane.

Keywords

Poly(2,5-benzimidazole);Membrane;High temperature proton electrolyte membrane fuel cells;Mechanical property;Proton conductivity

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