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

Jisu Shin, Sungeun Yang, Ho Il Ji, Sangbaek Park, Hyoungchul Kim, Ji Won Son, Jong Ho Lee, Byung Kook Kim, Jongsup Hong, Kyung Joong Yoon

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number159092
JournalJournal of Alloys and Compounds
Volume868
DOIs
Publication statusPublished - 2021 Jul 5

Bibliographical note

Funding Information:
This research was financially supported by the Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20193010032460), the institutional research program of the Korea Institute of Science and Technology (KIST) and Yonsei-KIST Convergence Research Program. We would like to thank Lauren Plavisch and Editage (www.editage.com) for English language editing.

Funding Information:
This research was financially supported by the Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) funded by the Ministry of Trade, Industry and Energy , Republic of Korea (No. 20193010032460 ), the institutional research program of the Korea Institute of Science and Technology (KIST) and Yonsei-KIST Convergence Research Program . We would like to thank Lauren Plavisch and Editage ( www.editage.com ) for English language editing.

Publisher Copyright:
© 2021 The Author(s)

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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