A study on mechanism of alkaline membrane fuel cell by using electrochemical impedance spectroscopy = 교류 임피던스 방법을 이용한 고체 알칼리 연료전지 메커니즘에 대한 연구

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Alkaline membrane fuel cells (AMFCs) offer significant advantages over traditional (aqueous KOH-based) alkaline fuel cells, in that membrane based systems avoid issues of electrolyte migration, mitigate corrosion concerns, can be operated with differential pressures, prevent carbonate precipitation and offer design simplification. However, AMFCs still have some problems that need to be resolved such as their relatively poor stability and the low conductivity of currently available alkaline membranes. Only a small amount of research on these fuel cells appears in the literature and unlike polymer electrolyte fuel cells (PEFCs), only a few preliminary results of the AMFCs have been reported about the electrochemical reaction mechanism. In this regard, it is necessary to understand the reaction mechanism by in-situ electrochemical characterization techniques such as electrochemical impedance spectroscopy (EIS), polarization curve, cyclic voltammetry (CV) and current interruption methods. Among these techniques, EIS has many advantages including reduced experimental error, limited potential control error, separated physical phenomena. The present work was mainly focused on the investigation of the mechanism of AMFCs by using electrochemical impedance method. In addition, the improved membrane electrode assembly (MEA) durability of AMFCs by addition of polymer binder was established by analysis of the interfacial cohesion effect. In chapter Ⅲ, effective electrochemical analysis for AMFC MEA by using polarization curve and EIS was conducted under various conditions including gas flow rate, cell temperature, catalyst type and oxygen concentration to investigate the mechanism of the AMFC. According to the type of the catalyst in MEA, the impedance increase along the operation voltage from 0.8 V to 0.4 V for both catalysts, Pt and non-Pt catalyst. But the magnitude of the impedance by non-Pt catalyst is higher than that of the Pt catalyst due to the high charge transfe...
Advisors
Park, Seung-Binresearcher박승빈
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
513593/325007  / 020095297
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2013.2, [ viii, 104 p. ]

Keywords

Alkaline membrane fuel cell; Membrane electrode assembly; Electrochemical impedance spectroscopy; Durability; 고체 알칼리 연료전지; 막전극 접합체; 전기화학적 임피던스 분석법; 내구성; 고분자 결합제; Polymer binder

URI
http://hdl.handle.net/10203/179895
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=513593&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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