Electrical characterization of mixed conducting SCY-YDC composite electrolyte |
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| Affiliation: | 1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Youyi Road, Wuhan, Hubei 430062, China;2. Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China;3. Department of Energy Technology, Royal Institute of Technology, Stockholm S-100 44, Sweden;1. Key Laboratory of Ferro & Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei, 430062, PR China;2. Department of Energy Technology, KTH Royal Institute of Technology, Stockholm, 10044, Sweden;1. School of Metallurgy, Northeastern University, China;2. Liaoning Key Laboratory for Metallurgical Sensor Materials and Technology, Northeastern University, China;3. School of Materials Science and Engineering, Northeastern University, China;1. School of Metallurgy, Northeastern University, China;2. Liaoning Key Laboratory for Metallurgical Sensor Materials and Technology, Northeastern University, China |
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| Abstract: | SrCe0.9Y0.1O3-δ-Ce0.9Y0.1O2-δ (SCY-YDC, 1:1 mole ratio), as a novel composite electrolyte, was successfully synthesized and characterized. X-ray diffraction patterns showed that SCY-YDC composite electrolyte is a mixture of SCY and YDC. Besides, no impurity phase emerged after sintering at 1550 °C for 10 h. AC impedance spectroscopy was used to determine the electrical properties of SCY-YDC at 500–800 °C in various atmospheres. Partial conductivities of oxygen vacancies, protons, and electrons (p-type) were calculated using the defect structure model. Results showed that SCY-YDC is a mixed (hole, proton, and oxygen-ion) conductor. Moreover, the contribution of holes is minor at 650–800 °C in high pressure (1 atm) or low pressure (10−4 atm) O2 atmospheres. Dominant carrier switched from protons to oxygen ions as temperature increased at vapor pressure in air of 0.038 atm. Total conductivity for SCY-YDC is 6.19 × 10−3 S cm−1 at 800 °C under pO2 = 1 atm and pH2O = 6 × 10−3 atm, which is higher than that of SCY (2.47 × 10−3 S cm−1). Results also showed that SCY-YDC composite material exhibits higher ionic conductivity and lower electron-hole conductivity than SCY. Electron-hole transference number for SCY-YDC is 0.049 at 800 °C in pO2 = 0.21 atm and pH2O = 0.038 atm. Ultraviolet–visible spectrophotometry results provided evidence that SCY-YDC can suppress electron conduction. |
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| Keywords: | Yttrium-doped strontium cerate (SCY) Yttrium-doped ceria (YDC) Partial conductivities Transport number Composite electrolyte |
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