Preparation and electrical properties of Ca-doped La2NiO4+δ cathode materials for IT-SOFC
文献情報
Yongna Shen, Xiaotong Liu, Nansheng Xu
Ca-doped La2NiO4+δ is synthesized via the nitrate–citrate route. The effects of Ca substitution for La on the sinterability, lattice structure and electrical properties of La2NiO4+δ are investigated. Ca-doping is unfavorable for the densification process of La2−xCaxNiO4+δ materials. The introduction of Ca leads to the elongation of the La–O(2) bond length, which provides more space for the migration of oxygen ion in La2O2 rock salt layers. The substitution of Ca increases remarkably the electronic conductivity of La2−xCaxNiO4+δ. With increasing Ca-doping level, both the excess oxygen concentration and the activation energy of oxygen ion migration decrease, resulting in an optimization where a highest ionic conductivity is presented. Ca-doping is charge compensated by the oxidation of Ni2+ to Ni3+ and the desorption of excess oxygen. The substitution of Ca enhances the structural stability of La2NiO4+δ material at high temperatures and renders the material a good thermal cycleability. La1.7Ca0.3NiO4+δ exhibits an excellent chemical compatibility with CGO electrolyte. La2−xCaxNiO4+δ is a promising cathode alternative for solid oxide fuel cells.
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