Spin-coated La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ) Electrolyte on Infiltrated Anodes for Direct Methane Fuel Cells

摘要

Dense micrometric La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ) (LSGM) films were deposited by spin-coating on porous LSGM scaffolds characterized by homogeneous pore structure. Porous anodes were infiltrated with aqueous nickel and nickel/copper nitrate solutions, dried and fired at 700°C. Homogeneous metal coating with proper interconnection was observed by SEM, chemical stability was confirmed by XRD, and electrical characterization of anodic substrates was performed. Catalytic activity of different anodes was evaluated ex-situ in a quartz micro-reactor fed with CH_4:CO_2 mixtureat range 650 and 700°C. To investigate the redox properties of the metallic phases, the anodic substrates were subjected to redox ageing cycles and characterized by H_2-TPR.