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High conductivity and high density SrCe0.5Zr0.35Y0.1A0.05O3-δ (A = Gd, Sm) proton-conducting electrolytes for IT-SOFCs

  • Nikdalila Radenahmad
  • Shammya Afroze
  • Ahmed Afif
  • Atia T. Azad
  • Ji-Seop Shin
  • Jun-Young Park
  • Juliana Haji Zaini
  • Abul Kalam AzadEmail author
Original Paper
  • 1 Downloads

Abstract

A novel Sr-based perovskite electrolyte, SrCe0.5Zr0.35Y0.1Gd0.05O3-δ, was successfully synthesized and characterized in comparison with SrCe0.5Zr0.35Y0.1Sm0.05O3-δ for possible use in proton-conducting solid oxide fuel cells. Indexing and subsequent Rietveld refinement confirm that both materials crystallize in the orthorhombic symmetry with Pbnm space group. Scanning electron microscopy images show the highly dense structure with the relative densities of 96% and 97% for Gd and Sm-doped sample, respectively. Electrochemical impedance measurements in wet 5% hydrogen at 700 °C shows that the conductivity of SrCe0.5Zr0.35Y0.1Gd0.05O3-δ and SrCe0.5Zr0.35Y0.1Sm0.05O3-δ were 5.701 ×10−3 S cm−1 and 5.257 × 10−3 S cm−1, respectively. The ionic conductivities of both samples increase in the wet hydrogen compared with that of dry hydrogen atmosphere. This indicates the enhancement of protonic conduction mechanism from introducing water in electrochemical impedance measurement. The proton conduction takes place at a lower temperature than conventional solid oxide fuel cell (SOFC) which makes SrCe0.5Zr0.35Y0.1(Gd/Sm)0.05O3-δ good electrolytes for intermediate-temperature solid oxide fuel cell (IT-SOFC).

Keywords

Proton-conducting electrolyte Sr-based perovskites Electrochemical impedance spectroscopy IT-SOFC 

Notes

Funding information

N. Radenahmad is thankful to Universiti Brunei Darussalam graduate scholarship for the financial support in PhD study. The research facilities of the laboratory in Universiti Brunei Darussalam were supported by research grant no. UBD/OVAORI/CRGWG(006)/161201.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Nikdalila Radenahmad
    • 1
  • Shammya Afroze
    • 1
  • Ahmed Afif
    • 1
  • Atia T. Azad
    • 2
  • Ji-Seop Shin
    • 3
  • Jun-Young Park
    • 3
  • Juliana Haji Zaini
    • 1
  • Abul Kalam Azad
    • 1
    Email author
  1. 1.Faculty of Integrated TechnologiesUniversiti Brunei DarussalamGadongBrunei Darussalam
  2. 2.Department of Chemical EngineeringUniversity of AberdeenScotlandUK
  3. 3.Department of Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoulRepublic of Korea

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