Characterization and electrochemical properties of chromium-substituted pyrochlore Y2Ti2−xCr xO7−δ

Chia Kan Hao, Hao En Hung, Chi Shen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Abstract: Pyrochlore oxides Y2Ti2−xCrxO7−δ have been investigated as electrolyte for solid oxide fuel cell. The as-prepared powder was synthesized by sol–gel method and characterized by powder X-ray diffraction, scanning electron microscope/energy-dispersive spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed reduction and AC impedance. Y2Ti2−xCrxO7−δ existed in single phase in a range of 0 < x ≤ 0.8, and the cell parameters decreased as the amount of Cr dopant increased. XPS analyses indicate that the average oxidation state of Crn+ ions decreased with the increased Cr content. Measurements of ionic conductivities induced that the optimized performance was observed at x = 0.2 with 0.01 S/cm at 700 °C due to an optimized condition of carrier concentration and carrier mobility. Graphical Abstract: Y2Ti2−xCrxO7−δ existed in single phase in a range of 0 < x ≤ 0.8 and the optimized performance of ionic conductivity was observed at x = 0.2 with 0.01 S/cm at 700 °C.[Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)428-435
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume76
Issue number2
DOIs
StatePublished - 2 Nov 2015

Keywords

  • Chromium-substituted
  • Electrical conductivity
  • Ionic conductivity
  • Pyrochlore
  • SOFC
  • YTiO

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