Enhancement of redox stability and electrical conductivity by doping various metals on ceria, Ce1-xMxO2-δ (M=Ni, Cu, Co, Mn, Ti, Zr)

Jaeha Myung, Tae Ho Shin, Xiubing Huang, George Michael Carins, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
1 Downloads (Pure)

Abstract

Various metal oxide materials have been actively investigated to improve energy efficiency as exhaust-catalyst as well as electrodes in electrochemical devices such as fuel cells, ceramic sensors, photo-catalyst etc. Ceria-based materials are of great interest due to their wide applications; such as redox or oxygen storage promoter in automotive catalyst and solid state conductor in fuel cells. Here we report redox and electrical properties for Ce1-xMxO2-δ (M=Ni, Cu, Co, Mn, Ti, Zr) by X-ray diffraction (XRD) and simultaneous thermo-gravimetric analysis (TGA). Among various system, Ce1-xCuxO2-δ and Ce1-xNixO2-δ indicated relatively reversible redox behavior, although Cu2+ and Ni2+ had limited solid solubility in CeO2. The enhancement of oxygen carrier concentration and electrical conductivity as well as electrochemical activity in the ceria lattice by the introduction of small amounts transition metal cations have been considered in this study. Ce0.7Cu0.3O2-δ showed about 1015 μmol[O2]/g of oxygen storage capacity (OSC) with high redox stability at 700oC. We also demonstrated that Ce0.9Ni0.1O2-δ was used as an anode of the YSZ electrolyte supported SOFC single cell; the maximum power density was 0.15 W/cm2 at 850oC with hydrogen fuel.

Original languageEnglish
Pages (from-to)12003-12008
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number35
Early online date10 Jun 2015
DOIs
Publication statusPublished - 21 Sept 2015

Keywords

  • Ceria
  • Redox stability
  • Electrical conductivity
  • Oxide anode
  • Solid oxide fuel cell

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