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標題:(R,M)2(Zr,Ti)2O7- d 作為SOFC電解質材料的研究開發
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學期
出版(發表)日期2011/01/01
作品名稱(R,M)2(Zr,Ti)2O7- d 作為SOFC電解質材料的研究開發
作品名稱(其他語言)Research and development of SOFC electrolyte materials, (R,M)2(Zr,Ti)2O7-d
著者高惠春
單位淡江大學化學學系
描述計畫編號1002001INER055 ;
研究期間20110101~20111231 ;
研究經費950,000
委託單位行政院原子能委員會
摘要In this project, development of high oxide ion conductors for the advanced intermediate temperature (IT, 400700 C) solid oxide fuel cell (IT-SOFC) application is the major goal. The high operating temperature (HT, 8001000 C) of the conventional SOFC technology puts very high demands on the materials and technology, which is the reason why the material R&D still poses a major challenge for further development of the SOFC technology into the market. In order to lower the operating temperature, the electrolyte should have higher oxide ion conductivity. Possible candidates are (R,M)2(Zr,Ti)2O7- with pyrochlore structure, CeO2 and Bi2O3 with fluorite structure, and (R,M)BO3- with perovskite structure, where R is a rare earth element, M is a 1+ or 2+ metallic element and B is an element with 24 valence state transition metal or main group element. If the materials have mixed valence cations existing, electronic conductivity would be increased and become improper electrolytes used in the fuel cell. How to stabilize the preferred valence state is an important direction of this research. Doping is one way. However, the higher valence state (4+) of Ce and Ti should be preserved; on the other hand, the lower valence state (3+) should be stabilized for Bi. Different solutions should be adopted.;本計畫主要的研究目標是開發有較高氧離子導電度且適合於應用在中溫 (IT, 400700 C) 固態氧化物燃料電池 (IT-SOFC) 中作為電解質的材料。傳統的SOFC的操作溫度是8001000 C,對組裝材料有很高的要求,使得材料的研究變成SOFC技術進入市場的主要挑戰。降低SOFC的操作溫度需要高導電度的氧離子導體,它們是有pyrochlore 結構的(R,M)2(Zr,Ti)2O7-、螢石結構的CeO2和Bi2O3、以及perovskite 結構的 (R,M)BO3-,其中R是稀土元素,M是1價或2價的金屬元素,B可能為24價的過渡金屬或是主族元素。以上材料中的元素若含有混合原子價時,其電子導電度會上升,使其不利於作為燃料電池電解質。如何穩定這些元素的原子價將是本研究的重要方向。基本上會以摻雜的方式去穩定Ce4+、Ti4+、Bi3+或其他元素的原子價。在Ce 和Ti中,要穩定較高的原子價,即4價;在Bi中,卻要穩定較低的原子價,即3價,所以,作法上會有差異。
關鍵字氧離子導體; 固態氧化物燃料電池; 螢石; 焦綠石; 鈦酸鈣礦; oxide ion conductors; SOFC; fluorite; pyrochlore; perovskite
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