Chem. Commun. 2011, 47, 2378–2380--supporting.pdf

Novel Mn1.5Co1.5O4 spinel cathodes for intermediate temperature solid oxide fuel cells Huanying Liu, a, b Xuefeng Zhu, a* Mojie Cheng, c You Cong, a Weishen Yang a* aState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China. bGraduate School of Chinese Academy of Sciences, Beijing, 100039, China cLaboratory of Fuel Cells, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China. Experimental Preparation of cathode powder Mn1.5Co1.5O4 (MCO), Sm0.2Ce0.8O1.9 (SDC) and Sm0.5Sr0.5CoO3 (SSC) powders were synthesized by a citrate and EDTA process.1 Stoichiometric amounts of the metal nitrates were dissolved in deionized water, and then a combination of EDTA and citric acid equal to the total number of moles of the metal ions as complexing agents. The mixed solution was slowly heated to combustion point to form the precursor ash. The ash was fired in air for 4 h at 800 oC for MCO and SDC and 900 oC for SSC. Fabrication of Anode- supported SOFCs Anode substrate YSZ-NiO (50 %:50 % weight ratio) were by grinding in a mortar, then suitable organic binders and n-butanol solvent were added, and the mixture was fabricated via a tape-casting process.2 A colloidal YSZ suspension was then applied to one side of the anode substrate by a slurry coating method. The anode/electrolyte discs thus obtained sintered at 1400 oC for 2 h in air. The sintered discs were about 21 mm in diameter and 450 μm in thickness. The thickness of the YSZ electrolyte film was approximately 13 μm. A cathode paste of MCO, MCO-SDC (mechanical mixing 50%:50%, weight ratio), SSC or LSM-YSZ (mechanical mixing 50%:50%, weight ratio) dispersed in terpineol was applied to the electrolyte surface by doctor blade processing (a convenient method for cathode fabrication).3, 4 The cells were then fired at 1100 oC for 3 h in air, except for the one with the LSM-YSZ cathode fired at 1200 oC. The