Enhanced Oxygen Reduction Reaction of LSCF Cathode Material Added with NiO for IT-SOFC

Authors

  • Ahmad Zaki Mohamed Rosli Universiti Sains Malaysia
  • Nafisah Osman Universiti Teknologi MARA
  • Mahendra Rao Somalu Universiti Kebangsaan Malaysia
  • Noorashrina A. Hamid Universiti Sains Malaysia

DOI:

https://doi.org/10.4186/ej.2022.26.9.11

Keywords:

cathode, LSCF-NiO, characterization, modified sol-gel method, IT- SOFC

Abstract

La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is one of the mixed ionic electronic conductors that could be feasibly used in an intermediate temperature solid oxide fuel cell (IT-SOFC). In this study, LSCF and NiO were prepared using a modified Pechini method and calcined at three different temperatures ranging from 600 °C to 900 °C. The prepared LSCF was added with 5% NiO (denoted as LSCF-NiO) as cathode material. The physical and electrical properties of the prepared cathode were investigated. X-ray diffraction data revealed that at calcination temperatures of 600 °C–900 °C, NiO and LSCF maintained their phases and conformed the cubic structure for NiO and orthorhombic structure for LSCF. The calcination temperature showed significant influence on the particle size of the prepared LSCF-NiO, as depicted by scanning electron microscopy (SEM), and all the powders reached a nanoscale size. The SEM cross section of LSCF-NiO layer on gadolinium-doped cerium electrolyte showed an acceptable percentage of cathode porosity and good adhesivity at cathode/electrolyte interface. Energy dispersive X-ray analysis further verified the purity of the samples. Brunauer–Emmett–Teller surface area analysis was conducted, and the results revealed a trend of decreased surface area with an increase in calcining temperature. At an operating temperature of 800 °C, the electrochemical impedance spectroscopic results showed that LSCF-NiO 800 had a low Rp of 0.07 Ω cm2, and its Ea was found to be 159.5 kJ/mol, indicating that LSCF-NiO 800 is fit to be used as cathode material in IT-SOFC application.

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Author Biographies

Ahmad Zaki Mohamed Rosli
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School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal Penang, Malaysia

Nafisah Osman
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Faculty of Applied Sciences, Universiti Teknologi MARA, Kampus Arau, Cawangan Perlis, 02600 Arau, Perlis, Malaysia

Mahendra Rao Somalu
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Fuel Cell Institute, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia

Noorashrina A. Hamid
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School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal Penang, Malaysia

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Published In
Vol 26 No 9, Sep 30, 2022
How to Cite
[1]
A. Z. M. Rosli, N. Osman, M. R. Somalu, and N. A. Hamid, “Enhanced Oxygen Reduction Reaction of LSCF Cathode Material Added with NiO for IT-SOFC”, Eng. J., vol. 26, no. 9, pp. 11-23, Sep. 2022.
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