Promoted electrochemical performance of one-step sintered intermediate temperature solid oxide fuel cells using nanoscale electrodes

•SOFCs are prepared by a one-step co-pressing and co-sintering at 950 °C with Li-based sintering aids.•Low temperature co-sintering enables the application of nanoscaled materials with improved electrode kinetics.•The nanocomposite Ni-SDC and hierarchical SrNb0.1Fe0.9O3 give sufficient electrode act...

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Bibliographic Details
Published in:Materials research bulletin 2023-12, Vol.168, p.112452, Article 112452
Main Authors: Luo, Shiyi, Yang, Rui, Meng, Yuanjing, Maliutina, Kristina, Singh, Manish, Chiu, Te-Wei, Fan, Liangdong
Format: Article
Language:English
Subjects:
Nanostructural electrode
One-step sintering
Sintering aids
Solid oxide fuel cell
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Summary:•SOFCs are prepared by a one-step co-pressing and co-sintering at 950 °C with Li-based sintering aids.•Low temperature co-sintering enables the application of nanoscaled materials with improved electrode kinetics.•The nanocomposite Ni-SDC and hierarchical SrNb0.1Fe0.9O3 give sufficient electrode activity at intermediate-low temperature.•Electrolyte-supported SOFCs showed an OCV of 1.01 V at 500 °C and a peak power density of 291 mW cm−2 at 700 °C. Solid oxide fuel cells (SOFCs) require simple cell fabrication procedure and reduced sintering temperature to improve system economics and durability. In this work, we propose a one-step low temperature (950 °C vs. conventional ≥1300 °C) sintering technology to prepare doped ceria electrolyte-based SOFCs by adding 3 mol% of Li2O sintering aid. Super low temperature sintering grants the direct application of nanoporous Ni-based cermet anode and hierarchical SrNb0.1Fe0.9O3 cathode with improved catalytic activities, which improves SOFC efficiency. The ionic conductivity of the electrolyte and catalytic activities of electrodes are systematically investigated by the electrochemical impedance spectroscopy technique and analyzed by the distribution of relaxation time method. These electrolyte-supported SOFCs exhibit an OCV value of 1.01 V at 500 °C and a peak power density of 291 mW cm−2 at 700 °C as well as sufficient stability for 50 h. Our results demonstrate a reliable and affordable method for manufacturing high-performance SOFCs. [Display omitted]
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2023.112452