Sulfonated poly(arylene ether sulfone)/ORMOSIL (organically modified silicate) composite membranes for direct methanol fuel cell = 연료전지를 위한 술폰화 폴리술폰/오모실 복합 멤브레인의 몰폴로지와 물성에 관한 연구

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In order to retain the proton conductivity and reduce the methanol crossover in the direct methanol fuel cell (DMFC), a new approach to improve the DMFC membrane transport properties of sulfonated poly(arylene ether sulfone) copolymers (sPAES-60) has been tried, which is based on controlling the water-channel structure and the state of water by in-situ hybridization of ORMOSIL (organically modified silicates). Diethoxydimethylsilane (DEDMS) was employed as a functional ORMOSIL precursor. Its hydrophobic nature made it possible to adjust the hydrophilicity of the resulting hybrid membranes. The morphology of the hybrid membranes was investigated by FE-SEM and TM-AFM. The transport properties such as proton conductivity and methanol permeability were measured by the AC impedance spectroscopy and the liquid permeability measuring instrument, respectively. An increase of DEDMS uptake into sPAES-60 membranes allowed the water uptake to decrease and the water channels to become narrow and tortuous. The influence of DEDMS uptake on the state of water was investigated by measuring the characteristic melting peak of water at $0\degC$. Based on this investigation, the dependence of water uptake on the state of water was quantitatively identified. A noteworthy observation is that the incorporation of DEDMS into sPAES-60 was effective in suppressing the methanol crossover with slightly sacrificing the proton conductivity, resulting in the higher selectivity. This improvement in DFMC membrane transport properties was discussed in terms of the water-channel structure and the state of water.
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
419046/325007  / 020083248
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2010.2, [ ix, 72 p. ]

Keywords

water-channel structure; DMFC membranes; diethoxydimethylsilane; sulfonated poly(arylene ether sulfone); state of water; 물의 상태; 물 채널의 구조; 직접메탄올연료전지막; 다이에톡시다이메틸실란; 술폰화 폴리술폰

URI
http://hdl.handle.net/10203/29509
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419046&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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