La_(0.8)Sr_(0.2)MnO_3涂覆液浓度对La_(0.8)Sr_(0.2)FeO_3电极电化学性能的影响(英文)  

Effect of Coating Solution Concentration on Electrochemical Properties of La_(0.8)Sr_(0.2)MnO_3-coated La_(0.8)Sr_(0.2)MnO_3 Electrodes

作　　者：王靖[1] 张勇[1] 昝青峰[1] 邓长生[1] 

机构地区：[1]清华大学核能与新能源技术研究院,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《硅酸盐学报》2013年第4期443-450,共8页Journal of The Chinese Ceramic Society

摘　　要：研究了0.005、0.010、0.020、0.035和0.040 mol/L 5种不同浓度的La0.8Sr0.2MnO3(LSM)溶液涂覆La0.8Sr0.2FeO3(LSF)电极后,其电化学性能的变化。X射线衍射结果表明:LSM和LSF化学相容性好。扫描电子显微镜观察可见:电极的晶粒尺寸和涂层厚度随着涂覆液浓度的增加而增加。电化学阻抗谱表明:在阳极极化条件下,经过0.010 mol/L LSM溶液涂覆处理后的LSF电极表现为最佳的电化学性能,其极化电阻在800℃仅为0.3.cm2。而且无论在阳极极化还是阴极极化处理后,涂覆LSM后的LSF电极的极化电阻,1200s内都呈现下降的趋势,LSM涂覆后的LSF电极具有一定的抗阳极极化的能力,归因于LSM涂层的良好催化特性。因此,0.010mol/LLSM溶液涂覆处理后的LSF可以作为固体氧化物电解池的阳极材料。La0.8Sr0.2MnO3 （LSM）-coated La0.8Sr0.2FeO3 （LSF） electrodes were prepared via the infiltration of LSM stock solution with different concentrations （0.005, 0.010, 0.020, 0.035 and 0.040 mol/L） into porous LSF electrode. The effect of coating solution concentration on the electrochemical performance was investigated. The results obtained by X-ray diffraction indicated there was no reaction between the LSM and LSF in the LSM-coated LSF electrode. The thickness of coating and the grain size increased with the increase of LSM concentration. The porous LSF electrode coated with LSM solution of 0.010 mol/L exhibited an optimum performance under anodic polarization and the polarization resistance was 0.3 Ω.cm^2 at 800℃. Moreover, The polarization resistance variation of the LSM-coated LSF electrode was independent of the polarization directions, and decreased under both cathodic and anodic polarizations in a short-term （1 200 s）. The LSM electrocatalytic activity of the electrode surface played an important role in the performance enhancement. The LSM-coated LSF electrode with 0.010 mol/L LSM solution could be a promising anode material for solid oxide electrolysis cell.

关 键 词：锰酸锶镧 铁酸锶镧 电化学性能 阻抗谱 极化 极化电阻 

分 类 号：TG174.75[金属学及工艺—金属表面处理]