Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Nafion Impregnated Electrospun Polyethersulfone Membrane for PEMFC

Nafion 용액 함침과 전기방사를 이용한 고분자 전해질 연료전지용 폴리에테르술폰 막

  • Lee, Hong-Yeon (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Hwang, Hyung-Kwon (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Sang-Sun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Choi, Sung-Won (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Shul, Yong-Gun (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 이홍연 (연세대학교 화공생명공학과) ;
  • 황형권 (연세대학교 화공생명공학과) ;
  • 박상선 (연세대학교 화공생명공학과) ;
  • 최성원 (연세대학교 화공생명공학과) ;
  • 설용건 (연세대학교 화공생명공학과)
  • Received : 2009.12.08
  • Accepted : 2010.02.26
  • Published : 2010.03.30
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Abstract

In this study, we manufactured the membrane using the polyethersulfone (PES) of fiber by using the electrospinning method. The polymer electrolyte membrane for fuel cells was manufactured by impregnating Nafion solution to the porous PES membrane. We confirmed that electrospun PES membrane has higher thermal stability than Nafion 212 membrane by thermogravimetric analysis. Impregnated Nafion in the pores of the electrospun PES membrane was characterized by scanning electron microscopy. The AC impedance data shows the hydrogen ionic conductivity of $10^{-2}$ S/cm below $100^{\circ}C$. Nafion impregnated PES membrane shows the maximum performance at $90^{\circ}C$ showing current density of 389 mA/$cm^2$ at 0.6 V, while Nafion 212 membrane shows maximum at $75^{\circ}C$.

본 연구에서는 내열성 고분자인 폴리에테르술폰을 이용하여 전기방사의 방법으로 섬유 형태의 다공성 막을 제조하였다. 여기에 Nafion 용액을 함침 시켜 고분자 전해질 연료전지용 막을 제조하였다. 열중량 분석을 통해, 현재 고분자 전해질 막으로 상용화되어 널리 쓰이고 있는 Nafion 212보다 더 높은 열적 안정성을 갖는 것을 확인하였다. 주사전자현미경 측정을 통하여, 다공성의 폴리에테르술폰 막에 Nafion 용액이 수소이온 전도체로서 잘 함침 되어 있음을 확인할 수 있었다. AC impedance 측정 결과, $100^{\circ}C$ 이하의 온도범위에는 수소 이온 전도도가 $10^{-2}$ S/cm로 나왔으며, $100^{\circ}C$ 이상의 범위에서는 $10^{-3}$ S/cm의 값을 나타냈다. 0.6 V, $90^{\circ}C$의 조건에서 389 mA/$cm^2$의 전류밀도를 나타내었다. Nafion 212 상용 막이 $75^{\circ}C$에서 최대 성능을 나타내는데 반해, Nafion 용액을 함침시킨 폴리에테르술폰 막은 $90^{\circ}C$에서 최대 성능을 갖는 것으로 나타났다.

Keywords

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