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Related Experiment Videos

SrCe

Ruijuan Shi1, Wei Chen2, Wenli Hu3

  • 1School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. rjshi@fync.edu.cn.

Materials (Basel, Switzerland)
|September 12, 2018
PubMed
Summary
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A novel composite electrolyte, strontium cerate-based with sodium and potassium chlorides, significantly enhances ionic conductivity for high-temperature fuel cells. This material offers improved performance and lower processing temperatures.

Area of Science:

  • Solid-state chemistry and materials science.
  • Electrochemistry and energy conversion.

Background:

  • Strontium cerate (SrCeO₃) is a promising material for solid oxide fuel cells (SOFCs) but suffers from low conductivity.
  • Doping strontium cerate with samarium (SrCe₀.₉Sm₀.₁O₃₋α) improves conductivity but requires high processing temperatures.
  • Composite electrolytes offer a route to enhance ionic conductivity and reduce sintering temperatures.

Purpose of the Study:

  • To synthesize and characterize a SrCe₀.₉Sm₀.₁O₃₋α-NaCl-KCl composite electrolyte.
  • To evaluate the ionic conductivity and performance of the composite electrolyte in a fuel cell.
  • To investigate the potential for lower-temperature processing of cerate-based electrolytes.

Main Methods:

  • High-temperature solid-state reaction for precursor synthesis (Sm₂O₃, SrCO₃, CeO₂).
Keywords:
compositeconductivitydefectselectrolytesfuel cellhydrogen

Related Experiment Videos

  • Compounding and low-temperature sintering (750 °C) of SrCe₀.₉Sm₀.₁O₃₋α with NaCl-KCl.
  • X-ray diffraction (XRD) and scanning electron microscopy (SEM) for phase and microstructure analysis.
  • Electrochemical analysis to measure conductivity in a dry nitrogen atmosphere.

    • Main Results:

    • The SrCe₀.₉Sm₀.₁O₃₋α-NaCl-KCl composite electrolyte achieved a conductivity of 1.43 × 10⁻¹ S·cm⁻¹ at 700 °C, four orders of magnitude higher than SrCeO₃.
    • The composite electrolyte exhibited significantly higher conductivity (two orders of magnitude) compared to doped SrCe₀.₉Sm₀.₁O₃₋α alone.
    • Electrochemical impedance spectroscopy indicated the composite is a near-pure ionic conductor.
    • A H₂/O₂ fuel cell using the composite electrolyte showed low electrolyte (1.0 Ω·cm²) and polarization (0.2 Ω·cm²) resistances.
    • A maximum power density of 182 mW·cm⁻² was achieved at 700 °C.

    Conclusions:

    • The SrCe₀.₉Sm₀.₁O₃₋α-NaCl-KCl composite electrolyte demonstrates superior ionic conductivity compared to its constituent phases.
    • The composite enables significantly lower sintering temperatures (750 °C) compared to pure SrCeO₃ (1540 °C).
    • This material shows great promise for efficient, lower-cost solid oxide fuel cell applications.