Department of Energy Science and Engineering
AECSL(Advanced Energy Conversion and Storage Lab)
1. Journal Articles
Temperature-dependent long-term stability of Sr0.6Na0.4SiO2.8 fast ion conductors
- Title
- Temperature-dependent long-term stability of Sr0.6Na0.4SiO2.8 fast ion conductors
- Author(s)
- Joh, Dong Woo ; Shin, Hong Rim ; Kim, Jongwoo ; Lee, Kang-Taek
- DGIST Authors
- Lee, Kang-Taek
- Issued Date
- 2019-03
- Type
- Article
- Article Type
- Article
- Author Keywords
- Sodium doped silicates ; Solid electrolytes ; Long-term stability ; Phase transition ; Solid oxide fuel cells
- Keywords
- CONDUCTIVITY DEGRADATION ; ELECTROLYTE ; DYNAMICS
- ISSN
- 1226-086X
- Abstract
- In this work, for the first time, we systematically evaluated the temperature-dependent long-term stability of Na-doped SrSiO3 super ionic conductors. The total conductivity of the Sr0.6Na0.4SiO2.8 (40SNS) was monitored in situ by electrochemical impedance spectroscopy. The conductivity of the 40SNS at 700 °C degraded within 1 h due to the crystallization of Na2Si2O5. However, at 450 °C, the initial conductivity of the 40SNS was firmly maintained for 260 h without any observable phase transition. These results demonstrate the existence of a threshold temperature regime that suppresses the crystallization kinetics of the amorphous phase of Na-doped SrSiO3 materials. © 2018 The Korean Society of Industrial and Engineering Chemistry
- Publisher
- Korean Society of Industrial and Engineering Chemistry
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