Flash-Sintering and Characterization of La0.8Sr0.2Ga0.8Mg0.2O3-δ Electrolytes for Solid Oxide Fuel Cells

Kening Sun, Jing Zhang, Taizhi Jiang, Jinshuo Qiao, Wang Sun, David Rooney, Zhenhua Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM), a promising electrolyte material for intermediate temperature solid oxide fuel cells, can be sintered to a fully dense state by a flash-sintering technique. In this work, LSGM is sintered by the current-limiting flash-sintering process at 690°C under an electric field of 100 V cm-1, in comparison with up to 1400°C or even higher temperature in conventional furnace sintering. The resultant LSGM samples are investigated by scanning electron microscopy, X-ray diffraction, and electrochemical impedance spectroscopy. The SEM images exhibit well-densified microstructures while XRD results show that the perovskite structure after flash-sintering does not changed. EIS results show that the conductivity of LSGM sintered by the current-limiting flash-sintering process increases with sintering current density value. The conductivity of samples sintered at 120 mA mm-2 reaches 0.049 σ cm-1 at 800°C, which is approximate to the value of conventional sintered LSGM samples at 1400°C. Additionally, the flash-sintering process is interpreted by Joule heating theory. Therefore, the current-limiting flash-sintering technique is proved to be an energy-efficient and eligible approach for the densification of LSGM and other materials requiring high sintering temperature.

Original languageEnglish
Pages (from-to)487-495
Number of pages9
JournalElectrochimica Acta
Volume196
Early online date02 Mar 2016
DOIs
Publication statusPublished - 01 Apr 2016

Keywords

  • Current-limiting
  • Flash-sintering
  • LaSrGaMgO Electrolyte
  • Solid oxide fuel cells

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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