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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
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Oxide Ion-Conducting Materials Containing Tetrahedral Moieties: Structures and Conduction Mechanisms
Xiaoyan Yang1, Alberto J Fernández-Carrión1, Xiaojun Kuang1,2
1MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi 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 Reviews
|July 24, 2023
Summary
Tetrahedral chemistry in oxide ion conductors enhances oxide ion transport for solid oxide fuel cells. Understanding these structures reveals key factors for developing superior electrolytes.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Electrochemistry
Background:
- Oxide ion conductors are crucial for devices like solid oxide fuel cells (SOFCs) and oxygen sensors.
- Tetrahedral moieties in materials offer unique structural flexibility that facilitates ion transport.
Purpose of the Study:
- To provide a comprehensive review of oxide ion-conducting materials featuring tetrahedral units.
- To explore the structural and mechanistic aspects influencing oxide ion conduction in these materials.
Main Methods:
- Review of existing literature on crystalline and amorphous oxide ion conductors.
- Analysis of materials including gallates, silicates, germanates, molybdates, tungstates, vanadates, aluminates, niobates, titanates, indium oxides, and borates.
- Focus on the role of tetrahedral unit structure, dimensionality, defects, and transport mechanisms.
Main Results:
- Tetrahedral units, whether isolated or linked, significantly impact oxide ion mobility.
- Materials investigated exhibit varying polyhedral dimensionalities (0-3) and defect properties influencing conduction.
- Diverse systems demonstrate the potential for enhanced oxide ion conductivity.
Conclusions:
- The flexibility of tetrahedral units is key to facilitating oxide ion transport.
- Understanding tetrahedral chemistry provides pathways for discovering advanced electrolytes for SOFCs and related technologies.
- Elucidating the role of tetrahedral units offers insights into optimizing fast oxide ion conduction.
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