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Influence of current collecting and functional layer thickness on the performance stability of La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.8Sm0.2O1.9 composite cathode

  • S. A. Muhammed Ali
  • Mustafa Anwar
  • Lily Siong Mahmud
  • Noor Shieela Kalib
  • Andanastuti MuchtarEmail author
  • Mahendra Rao Somalu
Original Paper
  • 5 Downloads

Abstract

The effect of current collecting layer (CCL) and cathode functional layer (CFL) thicknesses on the catalytic activity of the La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.8Sm0.2O1.9 (LSCF-SDC) composite cathode was investigated by electrochemical impedance spectroscopy at 600 °C for 100 h. Results revealed that the charge transfer process associated with the incorporation of O2− ions and the surface oxygen reduction reaction rate are dependent on CFL and CCL thicknesses, respectively. Area-specific resistance is dependent on CCL thickness in high-frequency arcs and on CFL thickness in low-frequency arcs. No significant change was observed in area-specific resistance value as the thickness of LSCF CCL decreased (25–5 μm) while the LSCF-SDC CFL thickness (5-25 μm) was gradually increased. However, the LSCF-SDC composite cathode (without CCL) showed poor catalytic activity toward the oxygen reduction reaction and had a high area-specific resistance value (3.31 Ω cm2). When LSCF CCL (5 μm) was used, the area-specific resistance value decreased by 16 times relative to the ASR of a sample without CCL. The field emission scanning electron microscopy results indicated that these cathodes exhibited a clear change in microstructure on the surface of the LSCF CCL after 100 h of thermal treatment in oxygen. The particle agglomeration and Sr surface segregation affected the surface catalytic activity toward oxygen reduction reaction at the LSCF CCL. As a result, the ASR value increased gradually in 100 h thermal treatment.

Graphical abstract

Keywords

Solid oxide fuel cell Composite cathode Thickness Current collector Stability 

Notes

Acknowledgements

The authors would like to extend their gratitude to the Center for Research and Instrumentation Management of Universiti Kebangsaan Malaysia (The National University of Malaysia) for excellent testing equipment.

Funding

This work was supported by the Universiti Kebangsaan Malaysia (UKM) and Ministry of Education (MOE), Malaysia, through the research sponsorship of GUP-2016-045 and FRGS/1/2018/TK10/UKM/01/1.

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Copyright information

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

Authors and Affiliations

  1. 1.Fuel Cell InstituteUniversiti Kebangsaan Malaysia (UKM)BangiMalaysia
  2. 2.U.S.-Pakistan Center for Advanced Studies in EnergyNational University of Sciences and TechnologyIslamabadPakistan
  3. 3.Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia (UKM)BangiMalaysia

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