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A new scandium and niobium co-doped cobalt-free perovskite cathode for intermediate-temperature solid oxide fuel cells

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  • Chen, Guihua
  • Wang, Yong
  • Sunarso, Jaka
  • Liang, Fengli
  • Wang, Huanping

Abstract

In exploring new cobalt-free perovskite oxide cathodes for intermediate temperature SOFCs (solid oxide fuel cells), Sc and Nb co-doped SrFeO3-based perovskite, SSNF (SrSc0.175Nb0.025Fe0.8O3−δ) was synthesized. Powder X-ray diffraction, high resolution transmission electron microscopy and SAED (selected area electron diffraction) showed that SSNF crystallized in the tetragonal space group P4/mmm (#123) with lattice parameters of a = 3.912 Å and c = 7.794 Å. Upon heating from 400 °C to 1000 °C, the oxygen non-stoichiometry (δ) of SSNF increased from 0.19 to 0.47, concurrent with a decrease in the average valence state of iron from 3.73 to 3.03. The electrical conductivity of SSNF followed semi-conducting thermal dependence behavior, with values of 3.7–9.4 S cm−1 at 350–750 °C. O2-TPD (oxygen temperature programmed desorption) indicated the onset of Fe4+ reduction at ∼500 °C. SSNF exhibited a low thermal expansion coefficient value of 16.2 × 10−6 K−1 (70–900 °C), as anticipated by excluding cobalt from the perovskite lattice. SSNF was relatively inert to the SDC (Sm0.2Ce0.8O1.9) electrolyte up to 1000 °C. These features, and its low ASR (area specific resistance) of 0.236 Ω cm2 at 600 °C, denote the potential of SSNF and the opportunity to create new structures with improved performance through a co-doping strategy.

Suggested Citation

  • Chen, Guihua & Wang, Yong & Sunarso, Jaka & Liang, Fengli & Wang, Huanping, 2016. "A new scandium and niobium co-doped cobalt-free perovskite cathode for intermediate-temperature solid oxide fuel cells," Energy, Elsevier, vol. 95(C), pages 137-143.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:137-143
    DOI: 10.1016/j.energy.2015.11.061
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    References listed on IDEAS

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    1. Kim, Kyeong Hyun & Park, Young Min & Kim, Haekyoung, 2010. "Fabrication and evaluation of the thin NiFe supported solid oxide fuel cell by co-firing method," Energy, Elsevier, vol. 35(12), pages 5385-5390.
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    Cited by:

    1. Gao, Juntao & Ma, Dan & Zhao, Hui & Li, Qiang & Lü, Zhe & Wei, Bo, 2022. "Synergistically improving electrocatalytic performance and CO2 tolerance of Fe-based cathode catalysts for solid oxide fuel cells," Energy, Elsevier, vol. 252(C).
    2. Jiao, Yong & Zhang, Liqin & An, Wenting & Zhou, Wei & Sha, Yujing & Shao, Zongping & Bai, Jianping & Li, Si-Dian, 2016. "Controlled deposition and utilization of carbon on Ni-YSZ anodes of SOFCs operating on dry methane," Energy, Elsevier, vol. 113(C), pages 432-443.
    3. Asensio, Antonio Maria & Clematis, Davide & Viviani, Massimo & Carpanese, M. Paola & Presto, Sabrina & Cademartori, Davide & Cabot, Pere L. & Barbucci, Antonio, 2021. "Impregnation of microporous SDC scaffold as stable solid oxide cell BSCF-based air electrode," Energy, Elsevier, vol. 237(C).

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