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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/16212

Title: 低溫製備中溫固態氧化物燃料電池之多元摻雜CeO2基電解質及其特性研究
Low-Temperature Preparing Multi-Doping CeO2 Based Electrolyte of IT-SOFC and Thus Characterization
Authors: Yao-Ming-Wang
Contributors: NTOU:Department of Marine Engineering
Keywords: 多元摻雜氧化鈰;固態氧化物燃料電池;溶液蒸發法;微波燒結
multi-elemments doped CeO2;SOFC;solution evaporation;microwave sintering
Date: 2009
Issue Date: 2011-06-30T08:34:15Z
Abstract: 本研究旨在發展中低溫(400~800℃)高氧離子導電度的SOFC電解質,以取代傳統SOFC所使用的YSZ(yttria stabilized zirconia)。在400~800℃這個溫度範圍內,YSZ的氧離子導電度非常低,本研究以多元摻雜的CeO2系統(LSBC)為研究重心;氧化鈰摻雜二價、三價金屬,做為中溫的固態氧化物燃料電池電解質擁有高的氧離子導電率。然而多元素的摻雜氧化鈰(La1-x-ySrxBay)0.175Ce0.825O2-d很難在低的煆燒溫度下得到純相結構,透過傳統固態法(SS)製備組成,在傳統的燒結狀況下,燒結溫度也必需大於1500℃才可得到純相結構以及緻密的燒結密度。利用溶液蒸發法(SV)合成出50nm的LSBC粒子,低於700℃的煆燒溫度就可以得到純相的螢石結構,SV方法中,LSBC與檸檬酸最佳的莫耳比為1比2,可以達到均勻的組成以及純相結構,SV所得粉末可以降低燒結溫度至1300℃,遠低於SS方法的1500℃。微波燒結SV試片,燒結條件1400℃/15min,檢測溫度600℃的氧離子導電率有0.01S/cm,並且密度可以達到98%且晶粒大小約在1μm左右。
The aim of this study is to develop ceria-based solid electrolyte with high ionic conductivity for intermediate temperature(400-800℃)SOFC instead of conventional YSZ electrolyte. YSZ electrolyte shows very low ionic conductivity during operation at 400-800C. CeO2 materials doped with the di- or tri-valent metals possess high oxygen ionic conductivity for potential electrolyte use in intermediate temperature solid oxide fuel cell (SOFC). However, multi-elemments doped CeO2-based electrolyte, (La1-x-ySrxBay)0.175Ce0.825O2-d (LSBC) in this work, with pure phase is difficultly synthesized at low calcination temperature. High sintering temperature, e.g., > 1500℃, is also needed in conventional mixed oxide method to obtain pure fluorite structure and high density. In this work, nanoparticles less than 50nm of LSBC can be prepared by solution-evaporation method (SV) at constant temperature. Pure fluorite crystal structure can be obtained as low as 600℃. The optimal mole ratio of LSBC/citric acid in prepared solution is 1/2 to achieve homogeneous composition and pure phase of LSBC. The sintering densification temperature of 1300C for LSBC prepared by solution-evaporation method is far lower than the 1500C by mixed oxide method. The ionic conductivity of 1400C-MW sintered LSBC prepared by solution-evaporation method is about 0.01 S/cm at 600C. The relative density of microwave sintering reaches up to 98%. Small grain size of about 1m average is observed for 1400C sintered LSBC by solution-evaporation method.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0M96660016
Appears in Collections:[輪機工程學系] 博碩士論文

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