Record-low sintering-temperature (600 °c) of solid-oxide fuel cell electrolyte

Hari Prasad Dasari, Kiyong Ahn, Sun Young Park, Jongsup Hong, Hyoungchul Kim, Kyung Joong Yoon, Ji Won Son, Byung Kook Kim, Hae Weon Lee, Jong Ho Lee

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Abstract

One of the major problems arising with Solid-Oxide Fuel Cell (SOFC) electrolyte is conventional sintering which requires a very high temperature (>1300 °C) to fully densify the electrolyte material. In the present study, the sintering temperature of SOFC electrolyte is drastically decreased down to 600 °C. Combinational effects of particle size reduction, liquid-phase sintering mechanism and microwave sintering resulted in achieving full density in such a record-low sintering temperature. Gadolinium doped Ceria (GDC) nano-particles are synthesized by co-precipitation method, Lithium (Li), as an additional dopant, is used as liquid-phase sintering aid. Microwave sintering of this electrolyte material resulted in decreasing the sintering temperature to 600 °C. Micrographs obtained from Scanning/Transmission Electron Microscopy (SEM/TEM) clearly pointed a drastic growth in grain-size of Li-GDC sample (∼150 nm) than compared to GDC sample (<30 nm) showing the significance of Li addition. The sintered Li-GDC samples displayed an ionic conductivity of ∼1.00 × 10-2 S cm-1 at 600 °C in air and from the conductivity plots the activation energy is found to be 0.53 eV.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalJournal of Alloys and Compounds
Volume672
DOIs
Publication statusPublished - 2016 Jul 5

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Dasari, H. P., Ahn, K., Park, S. Y., Hong, J., Kim, H., Yoon, K. J., Son, J. W., Kim, B. K., Lee, H. W., & Lee, J. H. (2016). Record-low sintering-temperature (600 °c) of solid-oxide fuel cell electrolyte. Journal of Alloys and Compounds, 672, 397-402. https://doi.org/10.1016/j.jallcom.2016.02.184