멤브레인 (Membrane Journal)

  • 제20권4호
  • /
  • Pages.278-289
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  • 2010
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
권호 표지

고분자 전해질형 연료전지를 위한 TEOS가 함유된 술폰화 폴리아릴렌에테르술폰 복합막의 제조 및 특성

Novel Sulfonated Poly(arylene ether sulfone) Composite Membranes Containing Tetraethyl Orthosilicate (TEOS) for PEMFC Applications

  • 이근규 (한국화학연구원 에너지소재연구센터) ;
  • 김태호 (한국화학연구원 에너지소재연구센터) ;
  • 황택성 (충남대학교 화학공학과) ;
  • 홍영택 (한국화학연구원 에너지소재연구센터)
  • Lee, Keun-Kyu (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Tae-Ho (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Hwang, Taek-Sung (Department of Chemical Engineering, Chungnam National University) ;
  • Hong, Young-Taik (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT))
  • 투고 : 2010.09.27
  • 심사 : 2010.10.07
  • 발행 : 2010.12.30
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초록

술폰화 폴리아릴렌에테르술폰(SPAES) 고분자 전해질막은 상온($25^{\circ}C$, 100%RH)에서 우수한 수소이온전도도를 나타내는 반면 고온-저가습($120^{\circ}C$, 48%RH) 조건에서 나피온212 보다 낮은 수소이온전도도 값을 나타낸다. 이러한 단점을 극복하기 위해 수분 보유능력이 뛰어난 tetraethyl orthosilicate (TEOS)를 50, 100, 150, 200% 포함하는 SPAES 복합막을 제조하고 각각의 특성을 고찰하였다. FT-IR 및 TEM을 이용한 분석 결과 복합막 내에서 TEOS가 축합반응을 통하여 Si-O-Si 형태로 연결되었음을 확인하였으나, 입자 형태가 성장되지 않고 oligomer 형태로 이루어져 있음을 확인하였다. 또한 이러한 silicon dioxide 화합물이 복합막 내에서 균일하게 잘 분산되어 있음을 EDS 분석을 통해 확인하였다. TEOS를 함유한 복합막의 경우, TEOS의 수분 유지능력에 의해 높은 온도까지 휘발되지 않는 bound water의 함량이 증가함에 따라 고온에서도 높은 전도도를 유지 할 수 있었다. 이에 따라 TEOS 200% 함유된 복합막(ST200)은 $120^{\circ}C$, 48%RH에서 나피온보다 높은 수소이온 전도도(0.015 S/cm)를 나타내었다. 또한 순수 SPAES (ST0) 단일막 보다 무기물 첨가로 인해 열 안정성이 증가하였음을 알 수 있었다.

A series of composite membranes based on sulfonated poly(arylene ether sulfone) (SPAES) were prepared via addition of tetraethyl orthosilicate (TEOS) and solution casting method. The morphological structure, water uptake, proton conductivity of the resulting composite membranes were extensively investigated as function of the content of TEOS. By the sol-gel reaction, TEOS molecules were not completely converted to $SiO_2$ particles, but formed only oligomer-type. Also, EDS confirms that the resulting silicon dioxide was homogeneously distributed in the composite membranes. As the content of TEOS increased, the prepared membranes increased water uptake and proton conductivity at high temperature and low relative humidity condition. In particular, considerably high proton conductivity (0.015 S/cm) at $120^{\circ}C$ and 48%RH was demonstrated in the composite membrane containing 200% TEOS, which is 10 times greater than that of unmodified SPAES membrane. Also, the composite membranes were found to have enhanced thermal stability compared to the unmodified membrane.

키워드

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