Anodic Performance and Intermediate Temperature Fuel Cell Testing of La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-δ at Lanthanum Gallate Electrolytes

This study is focused on the electrochemical performance of perovskite-type materials based on doped LaGaO 3 (LGO). La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 - δ (LSGM) and La 0.9 Sr 0.1 Ga 0.8 Mg 0.115 Co 0.085 O 3 - δ (LSGMCo) were used as electrolytes and La 0.8 Sr 0.2 MnO 3 - δ (LSM) and La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 - δ (LSCM) as cathode and anode material, respectively. Much better performance was obtained at an LSGM electrolyte than at LSGMCo, probably due to interfacial reactions between LSGMCo and LSM. An LSGM electrolyte was prepared by tape casting with a thickness of about 120 μm and good values of power output in a conventional electrolyte-supported cell were achieved, 425 and 570 mW/cm 2 using wet 5% H 2 /Ar and pure hydrogen as fuel, respectively, and pure O 2 as oxidant at 1073 K.