Membrane/electrode assembly employing sulfonated aromatic polymers for polymer electrolyte fuel cells and their long-term stability = 술폰화 방향족 고분자를 도입한 고분자전해질 연료전지용 막/전극 접합체 및 이의 장기안정성 향상에 관한 연구

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Polymer electrolyte fuel cells (PEFCs) have been developed to produce efficient and environmentally friendly energy for stationary, transportation, and portable applications. In PEFCs, to substitute for Nafion membrane, numerous alternative membranes have been proposed and most of them are sulfonated aromatic polymer membranes. However, sulfonated aromatic polymer exhibits poor compatibility with Nafion and therefore the system composed of hydrocarbon membrane and Nafion-based electrode shows poor interfacial stability. In addition, the high IEC of sulfonated aromatic polymer results in much water uptake and such membranes exhibit poor dimensional stability because of polymer expansion by hydration. This thesis covered several strategies done last few years to alleviate or eliminate these disadvantages of sulfonated aromatic polymer membrane. In Chapter II, as the effort to improve the compatibility between membrane and electrode, sPEEK ionomer was introduced as the electrode binder. The electrode ionomer is a key component of the catalyst layer and therefore the introduction of new electrode ionomer would have a significant effect on cell performance. To investigate the effect of sulfonated poly(ether ether ketone) (sPEEK) as the electrode ionomer, the catalyst layer was prepared using sPEEK ionomer and its physical properties such as pore structure and the hydrophobicity were examined. The electrochemical characteristics of the membrane and electrode assemblies employing sPEEK ionomer-based catalyst layer were also analyzed. Even though sPEEK ionomer-based catalyst layer showed lower ohmic resistance compared with Nafion ionomer-based catalyst layer, complete pore-filling of sPEEK into the primary pore caused reduction in reactive surface area of the catalyst and hindrance in gas transfer. In addition, the very low hydrophobicity of sPEEK ionomer-based catalyst layer deteriorated gas transfer due to an increased water flooding. To adopt Nafion binder havi...
Advisors
Park, Jung-Kiresearcher박정기researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
455372/325007  / 020065076
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2010.08, [ x, 133 p. ]

Keywords

장기안정성; 막/전극 접합체; 고분자전해질 연료전지; 술폰화 방향족 고분자; sulfonated aromatic polymers; long-term stability; membrane/electrode assembly; polymer electrolyte fuel cells

URI
http://hdl.handle.net/10203/29101
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=455372&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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