Publication date: 10th April 2024
Utilizing rare-earth doped ceria in solid oxide cells (SOCs) engineering is indeed a strategy to enhance the electrochemical devices' durability and activity. Gd-doped ceria (GDC) is actively used for barrier layer and catalytic additives in solid oxide fuel cells (SOFCs). In this study, we conducted experiments with La-doped CeO2 (LDC) or Bi-doped Ceria-based materials, in which the Ce sites are predominantly occupied by La, to prevent the formation of the Ce-Zr solid solution. This LDC was comparably used as a functional interlayer between the electrolyte and cathode if sintered at lower temperatures to avoid La2Zr2O7 impurity. In addition, the high substitution of La3+ into the ceria lattice improves the oxygen non-stoichiometry of LDC, leading to accelerated electrochemical high performance by the additional role of LDC for oxygen supplier capacitance at high-current operation. Thus, we confirmed that the improved SOFC high performance was achieved at the maximum power density (MPD) of ~2.15 W cm-2 at 800oC when the optimized LDC buffer layer was hired at the anode supported typed- Samsung’s SOFC by lowering the sintering temperature to prevent LDC’s impurity reaction.
References
[1], C. Graves, Nat. Mater., 2014, 14, 239-244
[2], Tatsumi Ishihara, J. Korean Ceram. Soc. > Volume 53(5); 201
This research was supported by the National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT, grant numbers NRF- 2022M3H4A1A04076616, NRF-2021M3H4A3A02086499, NRF-2020M3H4A3105824. This work was also supported by KOREA HYDRO & NUCLEAR POWER CO., LTD (No. 23-Tech-13). We also thank the Ceramic Strategic Technology R&D program through the Korea Institute of Ceramic Engineering & Technology (KICET) (grant NTIS no. 1415187241, KPP22012,).
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