Abstract
Sr-Co containing perovskite oxides are prospective air electrode candidates for reversible solid oxide cells (RSOCs). However, their efficiencies are limited by Sr segregation and the high thermal expansion coefficient (TEC) of Co-based perovskites. Herein, La0.6Ca0.4Fe08Ni0.2O3−δ (LCaFN) is tailored as an Sr-Co-free perovskite air electrode for highperformance RSOCs. Compared with La0.6Sr0.4Fe0.8Ni0.2O3−δ (LSFN) and La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCoF), LCaFN has a high electrical conductivity (297 S cm−1), TEC compatibility (11.2 × 10−6 K−1) and improved chemical stability. Moreover, LCaFN has high oxygen reduction reaction (ORR) activity with a low polarization resistance (0.06 Ω cm2) at 800°C. A single-cell Ni-YSZ/YSZ/gadolinium-doped ceria (GDC)/LCaFN-GDC operated at 800°C yields a maximum power density of 1.08 W cm−2 using H2 as fuel. In the solid oxide electrolysis cell (SOEC) mode, the cell can achieve a current density of approximately 1.2 A cm−2 at 1.3 V with 70% humidity at 800°C. The cell exhibits good reversibility and remains stable in continuous SOEC and solid oxide fuel cell (SOFC) modes. These findings indicate the potential application of LCaFN as an air electrode material for RSOCs.
摘要
可逆固体氧化物燃料电池 (RSOC) 是一种新型高效的能量存储和转化装置, 具有高效率、 无污染和模块化等优点. 在本文中, La0.6Ca0.4Fe0.8Ni0.2O3−δ (LCaFN) 被用于高性能RSOC的无锶无钴钙钛矿空气电极. 与La0.6Sr0.4Fe0.8Ni0.2O3−δ (LSFN) 和La0.6Sr0.4Co0.2Fe0.8-O3−δ (LSCoF) 相比, LCaFN 具有较高的导电性 (297 S cm−1)、 良好的热膨胀系数兼容性 (11.2 × 10−6 K−1) 和较高的化学稳定性. 此外, LCaFN 在 800°C还具有高催化活性和低极化电阻 (0.06 Ω cm2). 单电池 Ni-YSZ/YSZ/GDC/LCaFN-GDC在800°C下的最大功率密度为1.08 W cm−2. 在固体氧化物电解池模式下, 电池在800°C、70% H2O、1.3 V电压下可实现约 1.2 A cm−2的电流密度. 同时电池还表现出良好的可逆性和运行稳定性. 研究结果表明, LCaFN作为RSOC的空气电极材料具有广阔的应用前景.
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Acknowledgements
This work was supported by the National Key Research & Development Program of China (2020YFB1506304, 2017YFE0129300 and 2016YFE0126900), the National Natural Science Foundation of China (52072135, 51672095 and U1910209), and the Major Science and Technology Innovation Project of Hubei Province (2018AAA057). Analytical and Testing Centre of Huazhong University of Science and Technology is appreciated for sample characterization assistance.
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Wang W conducted the experiments and wrote this paper; Tian Y gave the overall concept and revised the draft; Abhishek N conducted the data analysis; Liu Y and Li Y contributed to the theoretical analysis; Chi B was responsible for review and editing; Pu J contributed to resource support. All authors participated in the general discussion.
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Wenjie Wang received her Bachelor degree in engineering from China University of Geosciences (Wuhan). She is currently studying for a Master’s degree under the supervision of Professor Bo Chi at Huazhong University of Science and Technology (HUST). Her research interests include electrode materials for electrochemical energy storage devices, such as fuel cells.
Yunfeng Tian is currently a lecturer in the School of Materials Science and Physics at China University of Mining and Technology. He received his PhD degree from HUST, under the supervision of Professor Bo Chi. His research focuses on the development and characterization of novel electrode materials for solid oxide fuel cells and electrolysis cells.
Bo Chi is a professor of the Center for Fuel Cell Innovation, School of Materials Science and Technology at HUST, China. He received his BSc and Master degrees in materials science from China University of Geosciences (Wuhan) in 1998 and 2001, respectively, and his PhD degree in materials science from Tsinghua University in 2005. He worked as JSPS (The Japan Society for the Promotion of Science) postdoc at the National Institute of Advanced Industrial Science and Technology (AIST), Japan from 2005 to 2007 before he joined HUST. His current research interests are solid oxide fuel cells/electrolysis cells, metal-air battery and solar cells.
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Wang, W., Tian, Y., Liu, Y. et al. Tailored Sr-Co-free perovskite oxide as an air electrode for high-performance reversible solid oxide cells. Sci. China Mater. 64, 1621–1631 (2021). https://doi.org/10.1007/s40843-020-1567-2
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DOI: https://doi.org/10.1007/s40843-020-1567-2