Sc and Ta-doped SrCoO3-δ perovskite as a high-performance cathode for solid oxide fuel cells
Article
| Article Title | Sc and Ta-doped SrCoO3-δ perovskite as a high-performance cathode for solid oxide fuel cells |
|---|---|
| ERA Journal ID | 4883 |
| Article Category | Article |
| Authors | Xu, Xiaoyong (Author), Zhao, Jie (Author), Li, Mengran (Author), Zhuang, Linzhou (Author), Zhang, Jinxuan (Author), Aruliah, Sathia (Author), Liang, Fengli (Author), Wang, Hao (Author) and Zhu, Zhonghua (Author) |
| Journal Title | Composites Part B: Engineering |
| Journal Citation | 178, pp. 1-7 |
| Article Number | 107491 |
| Number of Pages | 7 |
| Year | 2019 |
| Publisher | Elsevier |
| Place of Publication | United Kingdom |
| ISSN | 1359-8368 |
| Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compositesb.2019.107491 |
| Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S135983681934260X |
| Abstract | Sealing and stability is the challenge for solid oxide fuel cells (SOFCs) at high temperature. It is crucial to operate SOFCs at a low temperature to avoid these issues. Thus, it is necessary to improve the sluggish oxygen reduction reaction (ORR) activity of cathode. The SrCoO3-δ perovskite with a cubic phase is identified as a potential cathode material for SOFCs due to its high oxygen permeability and reasonable electrical conductivity. However, it readily decomposes into the orthorhombic structured brownmillerite Sr2Co2O5 or hexagonal Sr6Co5O15 during high-temperature sintering resulting in the loss of a significant amount of lattice oxygen. Herein, we partially replace Co with Sc and Ta at SrCoO3-δ to stabilize its cubic perovskite structure and restrain the lattice oxygen loss, thus improving the oxygen-ionic conductivity, and the structural and chemical stability. The synthesized SrSc0.175Ta0.025Co0.8O3-δ (SSTC) cathode achieves a remarkably high ORR performance and an area-specific resistance obtained in this study reaches as low as 0.233, 0.033, and 0.004 Ω cm2 at 500, 600, and 700 °C, respectively. The new Sc and Ta-doped SrCoO3-δ perovskite cathode even present a better ORR activity than the previously reported Sc and Nb-doped SrCoO3-δ cathode. The reason for the improved performance by Ta doping is possible that Ta–O bond is stronger than Nb–O bond and the electronegativity of Ta5+ is lower than that of Nb5+, resulting in a lower valence state of cobalt and a higher oxygen vacancies concentration. |
| Keywords | Cathode material; Electrochemistry; Oxygen reduction reaction; Perovskite; Solid oxide fuel cell; SrCoO3-δ |
| ANZSRC Field of Research 2020 | 401605. Functional materials |
| Byline Affiliations | University of Queensland |
| Nanjing Tech University, China | |
| Centre for Future Materials | |
| Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6zx4/sc-and-ta-doped-srcoo3-perovskite-as-a-high-performance-cathode-for-solid-oxide-fuel-cells
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