Microwave sintering of ceria-doped scandia stabilized zirconia as electrolyte for solid oxide fuel cell

C. K. Ng, S. Ramesh, C. Y. Tan, Andanastuti Muchtar, Mahendra Rao Somalu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this work, the effect of microwave sintering on the properties of 1 mol% ceria-doped scandia stabilized zirconia (10Sc1CeSZ) was investigated. The sintering was carried out at temperatures 1300 °C and 1350 °C for 15 min using a 2.45 GHz microwave furnace. The sintering behavior of the microwave sintered ceramics was compared with that obtained via the conventional sintering at temperatures ranging from 1300 °C to 1550 °C with 2 h holding time. It was found that both sintering processes yielded highly dense samples with minimum density of 98% theoretical value. Phase analysis by X-ray diffraction revealed the presences of only cubic phase in all sintered samples. All sintered pellets possessed high Vickers hardness (13–14.6 GPa) and fracture toughness (∼3 MPa m1/2). Microstructural examination by using the scanning electron microscope showed that the grain size varied from 2.9 to 9.8 μm for the conventional sintered samples whereas the grain size of the microwave sintered ceramics was below 2 μm. Electrochemical Impedance Spectroscopy study recorded the maximum ionic conductivity of 0.280 S/cm at 800 °C for the conventional-sintered sample at 1550 °C whereas a high value of 0.314 S/cm was measured for the microwave-sintered sample at 1350 °C.

Original languageEnglish
Pages (from-to)14184-14190
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number32
DOIs
Publication statusPublished - 24 Aug 2016

Fingerprint

Scandium
scandium
Cerium compounds
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
zirconium oxides
Zirconia
sintering
Sintering
Electrolytes
Microwaves
electrolytes
microwaves
grain size
ceramics
Vickers hardness
Ionic conductivity
fracture strength
Electrochemical impedance spectroscopy
pellets

Keywords

  • Ionic conductivity
  • Mechanical property
  • Microwave sintering
  • Scandia stabilized zirconia
  • Solid oxide fuel cells (SOFC)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Microwave sintering of ceria-doped scandia stabilized zirconia as electrolyte for solid oxide fuel cell. / Ng, C. K.; Ramesh, S.; Tan, C. Y.; Muchtar, Andanastuti; Somalu, Mahendra Rao.

In: International Journal of Hydrogen Energy, Vol. 41, No. 32, 24.08.2016, p. 14184-14190.

Research output: Contribution to journalArticle

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