Lowering the Impedance of Lanthanum Strontium Manganite-Based Electrodes with Lanthanum Oxychloride and Lanthanum Scavenging Chloride Salts
Lowering the Impedance of Lanthanum Strontium Manganite-Based Electrodes with Lanthanum Oxychloride and Lanthanum Scavenging Chloride Salts
复制标题
用氯氧化镧和除镧氯化物盐降低锰酸锶镧基电极的阻抗
DOI：
10.1149/1945-7111/ac359a
复制
发表时间：
2021
影响因子：
3.9
通讯作者：
Gross, Michael D.
中科院分区：
文献类型：
--
作者：
Taylor, Thomas H.;Muhoza, Sixbert P.;Gross, Michael D.
在固体氧化物燃料电池运行条件下，研究了氯化物对镧锶锰钇稳定氧化锆（LSM-YSZ）阴极电化学行为的影响。渗透氯化镧溶液导致形成氧化氯化镧（LaOCl）相。LaOCl相也通过渗透氯化铵溶液形成；然而，镧从LSM相中被清除形成LaOCl。第三种渗透溶液是氯化锆和硝酸钇的混合物，通过清除LSM中的镧形成LaOCl，并产生YSZ纳米颗粒。电化学阻抗谱结果表明，与基线LSM-YSZ阴极相比，LaOCl改善了氧吸附动力学，将低频阻抗降低了30%。此外，从LSM中清除镧改善了氧离子扩散极化，观察到高频阻抗降低40%，串联欧姆电阻提高19%。最后，YSZ纳米粒子进一步降低了材料的高频阻抗和欧姆电阻，分别降低了45%和23%。研究结果揭示了降低LSM-YSZ阴极阻抗的新策略。
The impact of infiltrating chloride salts on the electrochemical behavior of lanthanum strontium manganite-yttria stabilized zirconia (LSM-YSZ) cathodes was investigated under solid oxide fuel cell operation. Infiltrating a lanthanum chloride solution resulted in the formation of a lanthanum oxychloride (LaOCl) phase. A LaOCl phase also formed by infiltrating an ammonium chloride solution; however, lanthanum was scavenged from the LSM phase to form LaOCl. The third infiltrating solution, a combination of zirconium chloride and yttrium nitrate, formed LaOCl by scavenging lanthanum from LSM and produced YSZ nanoparticles. Electrochemical impedance spectroscopy results suggest that LaOCl improves oxygen adsorption kinetics compared to a baseline LSM-YSZ cathode, reducing the low frequency impedance by 30%. In addition, scavenging lanthanum from LSM improved oxygen ion diffusion polarization as indicated by the observed 40% reduction in high frequency impedance and improved serial ohmic resistance by 19%. Finally, YSZ nanoparticles further reduced the high frequency impedance and ohmic resistance by 45% and 23%, respectively. The findings reveal new strategies for lowering the impedance of LSM-YSZ cathodes.