Evaluation of La0.6Sr0.4CoO3-δ-Ce0.85Sm0.075Nd0.075O2-δ composite cathodes for intermediate temperature solid oxide fuel cells

Zhangfa Huang, Zhijun Liu, Hua Hu, Jianxin Wang*, Ming Chen, Baohua Cao, Qin Wang, Jun Yang, Wanbing Guan, Tongxiang Liang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Aiming to lower the operating temperature of solid oxide fuel cells down to 500–700 °C, a Co-containing composite cathode La0.6Sr0.4CoO3-δ-Ce0.85Sm0.075Nd0.075O2-δ (LSC-SNDC) is prepared by the solid-liquid method. The crystallinity, grain size and microstructure of LSC powders are analyzed by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The LSC-SNDC cathodes with different mass ratios (LSC: SNDC = 100:0, 90:10, 70:30, 60:40 and 50:50) are implemented into symmetrical cells and full cells using screen printing. The effect of cathode sintering temperatures (900, 950, 1000, 1050 °C) is investigated at the symmetrical cell level. The lowest cathode polarization resistance (Rp) is obtained with the 50:50 sample sintered at 950 °C, demonstrating a Rp (symmetrical cell) of 0.0248, 0.0319, 0.0597, 0.1107 and 0.2304 Ω cm2 and a maximum power density (full cell) of 1963, 1535, 1013, 585, and 302mW cm−2 at 800, 750, 700, 650 and 600 °C, respectively. The LSC-SNDC (50:50) cathode exhibits a low thermal expansion coefficient of 12.3×10−6 K−1 and good compatibility with other cell components, as confirmed from SEM observations. The current work demonstrates that LSC-SNDC is a promising cathode material for intermediate temperature solid oxide fuel cells.
Original languageEnglish
JournalCeramics International
Volume48
Issue number11
Pages (from-to)16319-16325
Number of pages7
ISSN0272-8842
DOIs
Publication statusPublished - 2022

Keywords

  • La0.6Sr0.4CoO3-δ
  • Composite cathode
  • Solid-liquid method
  • Screen printing
  • Intermediate temperature solid oxide fuel cells

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