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Development of Melilite-Type Oxide Ion Conductors
Lijia Zhou1, Jungu Xu1, Mathieu Allix2
1Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, P. R. China.
Chemical Record (New York, N.Y.)
|July 31, 2020
Summary
Melilite structures show promise for solid oxide fuel cells (SOFCs) by enabling high oxide ion conductivity. Research reveals how ion movement in these materials can be optimized for better performance in low-temperature SOFCs.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Lowering solid oxide fuel cell (SOFC) operating temperatures necessitates advanced oxide ion conductor electrolytes.
- Tetrahedra-based structures, particularly layered tetrahedral network melilites, are emerging as promising candidates for oxide ion conduction.
Purpose of the Study:
- To systematically investigate the stabilization and migration mechanisms of interstitial oxide ions in melilite structures.
- To explore novel synthesis methods for creating metastable melilite oxide ion conductors.
- To evaluate the potential of melilite-type electrolytes for low-temperature SOFC applications.
Main Methods:
- Utilized local structural relaxation based on atomic and electronic structures.
- Employed experimental and theoretical approaches to analyze electrostatic Coulomb interactions and chemical bonding.
- Investigated full crystallization from glass as an innovative synthesis method.
Main Results:
- Identified cationic size and chemical bonding as key factors influencing interstitial oxide ion stabilization and migration.
- Successfully synthesized new metastable melilite oxide ion conductors inaccessible via traditional solid-state reactions.
- Demonstrated high oxide ion conductivity and excellent thermal/chemical stability in LaSrGa3O7-based melilites.
Conclusions:
- Melilite structures offer significant potential for high-performance oxide ion conduction.
- Optimized melilite compositions exhibit properties suitable for low-temperature SOFC electrolytes.
- These findings pave the way for practical applications of melilite-type electrolytes in SOFCs and related devices.
