SrCo0.9-xMxNb0.1O3-δ(M=Fe, Ni)电极的制备及氧还原性能研究
毕业论文关键词SrCo0.9-xMxNb0.1O3-δ(M=Fe, Ni)阴极 固相法 极化电阻 功率密度 间接碘量法 氧空位含量
Title Preparation and Study on the Performance of OxygenReduction of SrCo0.9-xMxNb0.1O3-δ(M=Fe, Ni) Electrode
Abstract This paper focuses on the redox properties of SrCo0.9-xMxNb0.1O3-δ(x=0.2, M=Fe, Ni)(SCN,including SCFN and SCNN) cathode materials, and we discussed its possibility to become a newtype of ITSOFC cathode material. In this paper, solid phase methods have been used to preparecathode powders and Ce0.8Sm0.2O2-δ electrolyte(SDC),whose particle size are within 1-10micro-level. Then we used conductivity, XRD, thermalgravimetric analysis, electrochemicaltests , SEM and oxygen vacancy content measured by the indirect iodimetry to characterize theproperties of cathode powders. Our study found that the powders we prepared has beencrystallized into pure phase,and the conductivity of SCFN reached maximum 260 S•cm-1at350℃which has guaranteed its possibility of working at intermediate temperature.The oxygenvacancy content in other words δ of SCFN and SCNN powders we prepared are 0.262 and 0.299at room temperature, respectively, that shows the oxygen vacancy concentration is considerablewhich can improve the oxygen ion migration velocity effectively and thus improve theperformance of the cell. In addition, the polarization resistance of SCFN and SCNN symmetriccell reached 0.09 and 0.07 Ω•cm2at 800℃respectively. Moreover the power density of SCFNand SCNN single cell reached 42 and 97 mW•cm-2. All the results indicate that SCN material isa new potential cathode material for ITSOFCs and SCNN is more preferred.Keywords SrCo0.9-xMxNb0.1O3-δ(M=Fe, Ni) solid phase methods polarization resistancepower density indirect iodimetry oxygen vacancy concentration
目录
1绪论1
1.1引言..1
1.2SOFC的工作原理1
1.3SOFC的特点..2
1.4SOFC的组成与结构3
1.4.1SOFC的主要组成..3
1.4.2SOFC的结构模式..5
2实验与表征6
2.1实验原料和实验仪器.6
2.1.1实验原料..6
2.1.2实验仪器..7
2.2材料合成7
2.3样品制备9
2.3.1电解质片的制备..9
2.3.2电极浆料的制备..9
2.3.3对称电池的制备..9
2.3.4单电池的制备.10
2.3.5电化学测量样品的制备10
2.4测量所用设备仪器10
2.4.1X射线衍射仪.10
2.4.2热重（TG）分析..11
2.4.3SEM分析..11
2.4.4交流阻抗谱..11
2.4.5单电池性能测试11
2.4.6电导率测试..11
2.5氧空位浓度测试.22
2.5.1间接碘量法简介22
2.5.2溶液的配制..13
2.5.3滴定精度的标定13
2.5.4样品的滴定..14
3结果与讨论.16
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