A study on composite and fe-based new cathode materials for solid oxide fuel cells고체 산화물 연료전지용 복합체 및 Fe 기반 신조성 공기극 소재에 관한 연구

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Solid oxide fuel cells (SOFCs) offer a clean, low-pollution technology to electrochemically generate electricity at high efficiencies. These fuel cells provide many advantages over traditional energy conversion systems including high efficiency, reliability, modularity, fuel adaptability, and very low levels of NOx and SOx emis-sions. Quiet, vibration-free operation of SOFCs also eliminates noise usually associated with conventional power generation systems. In the past years, SOFCs were being developed for operation primarily in the tem-perature range of 900 to 1000 oC; in addition to the capability of internally reforming hydrocarbon fuels (e.g., natural gas), such high temperature SOFCs provide high quality exhaust heat for cogeneration, and when pressurized, can be integrated with a gas turbine to further increase the overall efficiency of the power system. Such a high operating temperature of around 1000 oC leads to several difficulties: (i) limitation in the choice of cathode, anode, and interconnect materials due to undesirable interfacial reactions among them, (ii) thermal expansion mismatch among the electrolyte and electrodes and consequent degradation in mechanical properties, (iii) problems with sealing, and (iv) long-term stability and durability. However, reduction of the SOFC operating temperature by 200 oC can be overcome or minimized these problems. In addition it allows use of a broader set of materials, is less-demanding on the seals and the balance-of-plant components, simplifies thermal management, aids in faster start up and cool down, and results in less degradation of cell and stack components. Because of these advantages, activity in the development of SOFCs capable of operating in the temperature range of 650 to 800 oC has increased dramatically in the last few years. In the intermediate temperature region (600 - 800 oC), however, the cathode becomes the limiting factor in determining the overall cell performance because the polarizat...
Advisors
Kim, Do-Kyungresearcher김도경
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
567209/325007  / 020085140
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2011., [ xii, 168 p. ]

Keywords

Solid Oxide Fuel Cell; Fe 기반 공기극 소재; 복합체 공기극; 공기극 소재; 고체 산화물 연료전지; Co-free Cathode; Cathode; Composite

URI
http://hdl.handle.net/10203/197309
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=567209&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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