Superior electrochemical performance of non-precious Co-Ni-Mo alloy catalyst-impregnated Sr2FeMoO6-δ as an electrode material for symmetric solid oxide fuel cells

• DOI: 10.1016/j.electacta.2016.07.037
• Publication Date: 2016-07-09T10:21:26Z
• Authors: Manasa K. Rath; Ki-Tae Lee
• Keywords: 7. Clean energy; 01 natural sciences; 0104 chemical sciences

Abstract Double perovskite-based Sr 2 FeMoO 6-δ (SFM), as an electrode material for symmetric solid oxide fuel cells (SOFCs), has been synthesized by a sucrose-modified combustion technique. SFM showed metallic conducting behavior with a conductivity of 215.72 S cm −1 in dry H 2 at 800 °C. The polarization resistance (R p ) for H 2 oxidation, evaluated using half-cell symmetry, was recorded as 0.192 Ω cm 2 under humidified H 2 at 800 °C. Improved catalytic activity was accomplished by impregnation of Pd or Co-Ni-Mo (0.1:5:1 molar ratio, CNM) via a glycine-mediated impregnation technique. The R p values for the Pd- and CNM-impregnated SFM were 0.087 and 0.060 Ω cm 2 , respectively, under humidified H 2 at 800 °C. The symmetric SOFC with an La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) electrolyte and a CNM-impregnated SFM electrode showed maximum power densities of 1066 mW cm −2 and 480 mW cm −2 at 800 °C under humidified H 2 and CH 4 , respectively.