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IT-SOFCs复合阴极中浸渍骨架的制备与表征

时间:2018-05-30 21:10来源:毕业论文
SDC多孔骨架的孔隙率很高,有利于氧离子的传输;30wt%造孔剂用量制备的复合阴极电池的活化能低,具有较好的反应活性而极化电阻只有0.16Ωcm2;浸渍工艺对复合阴极的TEC影响不大

摘要固体氧化物燃料电池(SOFC)是一种把连续供应的燃料和氧化剂中的化学能不停的转变成电能的电化学装置。但同时操作温度比较高(>800℃)带来了很多问题,诸如电池构件的高温氧化、化学腐蚀、化学扩散,以及反应会造成的部件性能减弱等。所以,在未来的固体氧化物燃料电池的研究中,实现SOFC的中低温化,还是一个很重要的难题。23552
作为中温固体氧化物燃料电池电解质材料,Sm0.2Ce0.8O1.9(SDC)是优秀的选择。原料粉末特性会对燃料电池电解质的性能有很显著的影响。本文采用柠檬酸-乙二醇低温燃烧法制备SDC粉体。并对这些SDC进行X射线衍射分析,扫描电镜分析。再对SDC烧结体进行SEM形貌分析。最后对SDC浸渍骨架的复合阴极进行阻抗分析等的电化学分析以及热膨胀分析等。
实验的结论如下:SDC多孔骨架的孔隙率很高,有利于氧离子的传输;30wt%造孔剂用量制备的复合阴极电池的活化能低,具有较好的反应活性而极化电阻只有0.16Ωcm2;浸渍工艺对复合阴极的TEC影响不大, 很好地解决了阴极与电解质TEC差距大而会引起的热应力,从而避免了电池在较高温度工作时出现的热膨胀失配导致电池失效的问题。
关键词  中温固体氧化物燃料电池(IT-SOFC)  钐掺杂的氧化铈(SDC) 
多孔骨架  复合阴极    
毕业设计说明书(毕业论文外文摘要
Title   Preparation and characterization of porous skeleton   in IT-SOFCs composite cathode                                               源¥自%六:维;论-文'网=www.lwfree.cn
Abstract
Solid oxide fuel cells(SOFC) is a electrochemical device turning continuous supply of fuel and oxidant of chemical energy into electricity. Problems such as high-temperature oxidationbattery components、chemical corrosion、chemical diffusion and weakness of components caused by reaction ,are brought up because of high working temperature(>800℃).Therefore,in the future study of solid oxide fuel cells, SOFC at a medium or low temperature is an important problem to solve.
Sm0.2Ce0.8O1.9(SDC)is a good choice of  the electrolyte of solid oxide fuel cells at medium temperature.Powder features of raw materials show an obvious influence on the properties of fuel cells electrolyte.In this article, Ce0.8Sm0.2O1.9(SDC)ultra-fine powder was synthesized using citric acid and ethylene glycol low temperature burning method,and LSCF - SDC nano composite cathode of the SDC electrolyte matrix was synthesized using the solution impregnation method. Finally, the SDC impregnated skeleton of impedance analysis of composite cathode electrochemical analysis and thermal analysis.
The conclusions of the experiments are as follows:The porous skeleton of SDC possess a high porosity,which is good for the transmission of oxygen ion;30 wt % of the preparation of pore-forming agent composite cathode battery low activation energy, has a better reactivity and activation resistance only 0.16 Ω cm2;The inlfuence of impregnation technics on the TEC of the composite cathode was not so obvious,which solved the thermal stress caused by big difference of cathode and  electrolyte TEC,and avoided the problem of mismatch caused by thermal expansion leading to the failure of batteries when batteries work at high temperature.
Keywords   Intermediate temperature solid oxide fuel cell (IT-SOFC)
           Sm0.2Ce0.8O1.9(SDC)   porous skeleton    composite cathode
目 次
1 绪论    1 源¥自%六:维;论-文'网=www.lwfree.cn
1.1 引言    1 IT-SOFCs复合阴极中浸渍骨架的制备与表征:http://www.lwfree.cn/cailiao/20180530/16669.html
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