La_2Ni_(0.8)Fe_(0.2)O_(4+δ)-La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)复合阴极的性能研究  

Performance of La_2Ni_(0.8)Fe_(0.2)O_(4+δ)-La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ) composite cathode materials

作　　者：袁晓佳 张华[1] 冯振禹 罗俊 施赟豪 YUAN Xiao-jia;ZHANG Hua;FENG Zhen-yu;LUO Jun;SHI Yun-hao(College of Meterial Science and Engineering,Nanjing Tech University,Nanjing Jiangsu 210009,China)

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《电源技术》2018年第3期384-387,共4页Chinese Journal of Power Sources

摘　　要：研究了La_2Ni_(0.8)Fe_(0.2)O_(4+δ)(LNF-02)-La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)(LS CF)复合阴极材料(LNF-02-x LS CF,10≤x≤40)的电性能、电化学性能、热膨胀性能。研究结果表明,LNF-02、LSCF、SDC之间的化学相容性良好。LNF-02-x LSCF复合阴极材料的电导率在600~800℃范围内均高于100 S/cm,且随着LSCF复合量的增加而逐渐升高。1 000℃煅烧制备的复合阴极与SDC电解质接触良好,表现出最低的极化电阻。LSCF的最佳复合量为20%(x=20),此时LNF-02-20LSCF的热膨胀系数为14.36×10^(-6) K^(-1)。1 000℃煅烧制备的LNF-02-20LSCF复合阴极在750℃测试的界面极化电阻为0.68Ω·cm^2。结果显示,LNF-02-20LS CF复合阴极材料有望成为新型IT-S OFC阴极材料。La2Ni0.8Fe0.2O4+δ(LNF-02)-La0.6Sr0.4Co0.8Fe0.2O3-δ(LSCF)composite cathodes(LNF-02-xLSCF,10≤x≤40)were synthesized to study the performance of the electrochemical,electrical conductivity and thermal expansion.The results indicate that LNF-02,LSCF,SDC exhibits the good chemical compatibility.It is found that the electrical conductivity of LNF-02-xLSCF(10≤x≤40)is more than 100 S/cm in the temperature range of 600~800℃and increases with x increasing.LNF-02-xLSCF composite cathodes exhibits good contact with SDC electrolyte.The composite cathodes calcined at 1 000℃shows the lowest polarization resistance.The thermal expansion coefficient(TEC)for composite cathode with 20%LSCF content is 14.36×10-6 K-1.The polarization resistance of LNF-02-20LSCF cathode calcined at 1 000℃was 0.68Ω·cm2.It implies that LNF-02-20LSCF composite cathode demonstrates the potential as a cathode material for IT-SOFCs.

关 键 词：复合阴极 电化学性能 电导率 热膨胀 

分 类 号：TM914[电气工程—电力电子与电力传动]