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

Title
Low-temperature processing technique of Ruddlesden-Popper cathode for high-performance solid oxide fuel cells
Authors
김병국이종호김형철손지원지호일윤경중양성은박상백신지수홍종섭
Keywords
Lanthanum nickelate; Solid oxide fuel cell; Cathode; Interface; Chemical reaction
Issue Date
2021-07
Publisher
Journal of alloys and compounds
Citation
VOL 868, 159092
Abstract
The Ruddlesden-Popper phase lanthanum nickelate, La2NiO4+δ (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 temperatures. 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 ~200 °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.
URI
http://pubs.kist.re.kr/handle/201004/72901
ISSN
0925-8388
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KIST Publication > Article
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