Preparation and electrical properties of Ca-doped La2NiO4+δ cathode materials for IT-SOFC

Literature Information

Publication Date 2010-10-22
DOI 10.1039/C0CP00261E
Impact Factor 3.676
Authors

Yongna Shen, Xiaotong Liu, Nansheng Xu


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Abstract

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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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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