期刊
ELECTROCHIMICA ACTA
卷 341, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136031
关键词
Solid oxide fuel cell; Nanoparticles; Core-shell structure; Sm0.5Sr0.5CoO3-delta cathode; Freeze-drying
资金
- National Natural Science Foundation of China [61605116, 51972208, 51972213, U1601207, 51772114]
- Key Scientific and Technological Research Project in Henan Province [192102210170, 14B430005, 182102210398]
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology [P2019-004]
- U.S. Department of Energy SECA Core Technology Program [DE-FE0031670]
The performance of solid oxide fuel cell (SOFC) can be significantly enhanced using nanostructured cathode obtained by infiltration/impregnation method. However, this method has been limited due to multi-step preparation process and instability of the obtained nanoscale catalyst under long-term operation. We report here a simple, cost-effective and reproducible approach to fabricate nanostructured Sm0.5Sr0.5CoO3-delta (SSC) cathode with enhanced performance and stability. The SSC powders were prepared by a freeze-drying method through a combustion route using Pluronic F-127 as the template. The SSC freeze-drying powders have unique morphology and a significant phase change at 750 degrees C. The oxygen non-stoichiometry (delta) of the SSC powders is 0.18 at room temperature, while the delta values are 0.66, 0.75 and 0.90 at 600 degrees C, 700 degrees C and 800 degrees C, respectively. The novel structured SSC cathode was prepared by screen-printing and one-step sintering process using the freeze-drying SSC powders. Maximum cell power densities of 0.83 and 1.13 W cm(-2) are achieved at 550 degrees C and 600 degrees C, respectively for single cells with the novel structured SSC cathode. Moreover, single cells show excellent stability at 600 degrees C under a current density of 600 mA cm(-2) over 250 h. This work expands opportunities to exploit nanotechnology in a wide range of intermediate and low temperature energy conversion devices. (C) 2020 Elsevier Ltd. All rights reserved.
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