Chemical Stability of La1-XSrxMn0.8Ni0.2O3-δ x={0.1 to 0.5} Cathode Compositions with 8YSZ at High Temperature

• Main Authors: Wiff, Juan Paulo, Matsuhashi, Hiroshi, Suda, Seiichi
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/07801.0827ecst

Ni-added LSM compositions (La1-xSrxMn0.8Ni0.2O3 with x={0.1 to 0.5}) and YSZ mixtures (50/50 wt%) were used for evaluating their chemical stability at high temperature (1300oC). Ni-added LSM raw powders were fabricated by using a glycine route. X-ray diffraction was used to quantify and identify crystallographic phases. DC four-probe measurement was used for electrical characterization. Results show that Ni-addition at the B-site of LSM structure is effective for suppressing the secondary phase formation, particularly La2Zr2O7, when strontium content is between 0.1≤x≤0.2. Electrical conductivity was about 100 S cm-1 within the chemically stable strontium content range. Therefore, it is expected that suppression of La2Zr2O7 formation at high temperature could improve SOFC performance, especially during long time operation, thus supporting the co-sintering of a whole SOFC ceramic stack at high temperature.