Low-temperature processing technique of Ruddlesden-Popper cathode for high-performance solid oxide fuel cells

JOURNAL OF ALLOYS AND COMPOUNDS

卷:868

Article

Shin, Jisu¹  Yang, Sungeun¹  Ji, Ho-Il¹  Park, Sangbaek¹  Kim, Hyoungchul¹  Son, Ji-Won¹  Lee, Jong-Ho¹  Kim, Byung-Kook¹  Hong, Jongsup^2,3  Yoon, Kyung Joong^1,3 

[1] Korea Inst Sci & Technol, Ctr Energy Mat Res, Seoul 02792, South Korea

[2] Yonsei Univ, Dept Mech Engn, Seoul 03722, South Korea

[3] Yonsei KIST Convergence Res Inst, Seoul 02792, South Korea

关键词: Lanthanum nickelate;    Solid oxide fuel cell;    Cathode;    Interface;    Chemical reaction;   

DOI  :  10.1016/j.jallcom.2021.159092

来源: Elsevier

【 摘 要 】

The Ruddlesden-Popper phase lanthanum nickelate, La2NiO4+delta (LNO), offers excellent material properties as a cathode for solid oxide fuel cells (SOFCs). However, taking full advantage of its intrinsic properties is difficult in realistic cells because of its high chemical reactivity with the electrolyte at elevated tempera-tures. Herein, we demonstrate high-performance SOFCs with an LNO-based cathode fabricated by a low-temperature processing route that suppresses harmful chemical reactions. The sintering capability of the composite cathode composed of LNO and gadolinia-doped ceria (GDC) was enhanced by mixing Fe-based sintering additive with GDC, which formed reliable interfacial bonding with the electrolyte at a temperature similar to 200 degrees C below the typical processing temperature. Because no interdiffusion between cathode and electrolyte occurs at such low temperatures, the cell is successfully fabricated without diffusion blocking layer, which simplifies the cell structure and manufacturing process. The cell with the LNO-based cathode outperformed state-of-the-art cells, particularly at lower operating temperatures. These results highlight that the processing parameters strongly affect the electrochemical performance of this LNO-based cathode and must be carefully engineered to fully exploit its superior intrinsic properties. (C) 2021 The Author(s). Published by Elsevier B.V.

【 授权许可】

Free