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Updated: Sep 29, 2025
11:07
Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
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Development of a Core-Shell Heterojunction TiO2 /SrTiO3 Electrolyte with Improved Ionic Conductivity
Li Fang1, Enyi Hu1, Xiaojian Hu2
1Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, School of Energy & Environment, Southeast University, Nanjing, 210096, China.
Summary
Researchers developed a novel TiO2-SrTiO3 core-shell electrolyte for semiconductor-membrane fuel cells (SMFCs). This material enhances proton conductivity, achieving high power density at low temperatures (<550°C) for efficient energy conversion.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Semiconductor-membrane fuel cells (SMFCs) are gaining interest for high performance at low temperatures (<550°C).
- Developing advanced electrolytes is crucial for improving SMFC efficiency and lowering operational temperatures.
- Nanostructured materials offer unique properties for enhanced ion transport in fuel cells.
Purpose of the Study:
- To synthesize a nanocomposite core-shell heterostructure (TiO2-SrTiO3) electrolyte powder for SMFCs.
- To investigate the heterojunction mechanism responsible for enhanced protonic conductivity.
- To evaluate the performance of the developed electrolyte in SMFCs at low operational temperatures.
Main Methods:
- Hydrothermal synthesis of TiO2-SrTiO3 core-shell nanocomposite powder.
- Characterization of the core-shell structure and material properties.
- Fabrication and testing of SMFCs utilizing the synthesized electrolyte.
Main Results:
- Successful synthesis of TiO2-SrTiO3 core-shell heterostructure via hydrothermal method.
- Demonstration of a heterojunction mechanism promoting proton transport and conductivity.
- Achieved peak power density of 951 mW/cm² and open-circuit voltage of 1.075 V at 550°C.
- Formation of a depletion region at the interface facilitated accelerated ion transport and reduced activation energy.
Conclusions:
- The TiO2-SrTiO3 core-shell heterostructure effectively enhances proton transport in SMFCs.
- The proposed heterojunction mechanism provides insights into improved ion conductivity.
- This work presents a novel methodology for developing high-performance, low-temperature ceramic fuel cells.
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