Chemical Stability of La_(1-x)Sr_xMn_(0.8)Ni_(0.2)O_(3-δ) x={0.1 to 0.5} Cathode Compositions with 8YSZ at High Temperature

摘要

Ni-added LSM compositions (La_(1-x)Sr_xMn_(0.8)Ni_(0.2)O_3 with x={0.1 to 0.5}) and YSZ mixtures (50/50 wt%) were used for evaluating their chemical stability at high temperature (1300°C). 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 La_2Zr_2O_7, 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 La_2Zr_2O_7 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.