Conductivity and redox stability of new perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu)

Peter Ian Cowin, Rong Lan, Christophe T. G. Petit, Dongwei Du, Kui Xie, Huanting Wang, Shanwen Tao

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

New perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu) were synthesised by sol-gel processes. Their redox stability and conductivity in both air and 5%H2/Ar were investigated in details. The cubic perovskite structure was also observed for all dopants with variation in the lattice parameters associated with different dopant environments and charge compensation mechanisms. Improvement of the electronic conductivity over SrFe0.9Ti0.1O3-δ was observed for all dopants in air, attributed to increasing charge carrier concentrations. Reduction in 5% H2/Ar exhibited minimal a material properties for SrFe0.7Cu0.2Ti0.1O3-δ, with a significant reduction in conductivity was observed for SrFe0.7Mn0.2Ti0.1O3-δ. All doped compounds exhibited a single phase cubic perovskite structure after reduction in 5%H2/Ar at 700 °C with the exception of SrFe0.7Ni0.2Ti0.1O3-δ and SrFe0.7Co0.2Ti0.1O3-δ which displays secondary nickel and cobalt phases respectively upon reduction. SrFe0.7Cu0.2Ti0.1O3-δ is redox stable at a temperature below 700 °C and highly conductive with conductivities around 10 S cm− 1 in both air and reducing atmosphere which are about five times higher than those of pure SrFe0.9Ti0.1O3-δ. In terms of conductivity and redox stability, it is a potential redox stable electrode material for reversible and symmetrical solid oxide fuel cells as well.

LanguageEnglish
Pages99-105
Number of pages7
JournalSolid State Ionics
Volume301
Early online date1 Feb 2017
DOIs
Publication statusPublished - 31 Mar 2017

Fingerprint

Perovskite
Oxides
conductivity
oxides
Doping (additives)
Air
air
Cobalt
Solid oxide fuel cells (SOFC)
Nickel
Charge carriers
Sol-gel process
Lattice constants
Carrier concentration
sol-gel processes
Materials properties
solid oxide fuel cells
electrode materials
charge carriers
lattice parameters

Keywords

  • conductivity
  • pPerovskite
  • redox stable
  • solid oxide fuel cell
  • strontium ferrite

Cite this

Cowin, Peter Ian ; Lan, Rong ; Petit, Christophe T. G. ; Du, Dongwei ; Xie, Kui ; Wang, Huanting ; Tao, Shanwen. / Conductivity and redox stability of new perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu). In: Solid State Ionics . 2017 ; Vol. 301. pp. 99-105.
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abstract = "New perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu) were synthesised by sol-gel processes. Their redox stability and conductivity in both air and 5{\%}H2/Ar were investigated in details. The cubic perovskite structure was also observed for all dopants with variation in the lattice parameters associated with different dopant environments and charge compensation mechanisms. Improvement of the electronic conductivity over SrFe0.9Ti0.1O3-δ was observed for all dopants in air, attributed to increasing charge carrier concentrations. Reduction in 5{\%} H2/Ar exhibited minimal a material properties for SrFe0.7Cu0.2Ti0.1O3-δ, with a significant reduction in conductivity was observed for SrFe0.7Mn0.2Ti0.1O3-δ. All doped compounds exhibited a single phase cubic perovskite structure after reduction in 5{\%}H2/Ar at 700 °C with the exception of SrFe0.7Ni0.2Ti0.1O3-δ and SrFe0.7Co0.2Ti0.1O3-δ which displays secondary nickel and cobalt phases respectively upon reduction. SrFe0.7Cu0.2Ti0.1O3-δ is redox stable at a temperature below 700 °C and highly conductive with conductivities around 10 S cm− 1 in both air and reducing atmosphere which are about five times higher than those of pure SrFe0.9Ti0.1O3-δ. In terms of conductivity and redox stability, it is a potential redox stable electrode material for reversible and symmetrical solid oxide fuel cells as well.",
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Conductivity and redox stability of new perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu). / Cowin, Peter Ian; Lan, Rong; Petit, Christophe T. G.; Du, Dongwei; Xie, Kui; Wang, Huanting; Tao, Shanwen.

In: Solid State Ionics , Vol. 301, 31.03.2017, p. 99-105.

Research output: Contribution to journalArticle

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T1 - Conductivity and redox stability of new perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu)

AU - Cowin, Peter Ian

AU - Lan, Rong

AU - Petit, Christophe T. G.

AU - Du, Dongwei

AU - Xie, Kui

AU - Wang, Huanting

AU - Tao, Shanwen

PY - 2017/3/31

Y1 - 2017/3/31

N2 - New perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu) were synthesised by sol-gel processes. Their redox stability and conductivity in both air and 5%H2/Ar were investigated in details. The cubic perovskite structure was also observed for all dopants with variation in the lattice parameters associated with different dopant environments and charge compensation mechanisms. Improvement of the electronic conductivity over SrFe0.9Ti0.1O3-δ was observed for all dopants in air, attributed to increasing charge carrier concentrations. Reduction in 5% H2/Ar exhibited minimal a material properties for SrFe0.7Cu0.2Ti0.1O3-δ, with a significant reduction in conductivity was observed for SrFe0.7Mn0.2Ti0.1O3-δ. All doped compounds exhibited a single phase cubic perovskite structure after reduction in 5%H2/Ar at 700 °C with the exception of SrFe0.7Ni0.2Ti0.1O3-δ and SrFe0.7Co0.2Ti0.1O3-δ which displays secondary nickel and cobalt phases respectively upon reduction. SrFe0.7Cu0.2Ti0.1O3-δ is redox stable at a temperature below 700 °C and highly conductive with conductivities around 10 S cm− 1 in both air and reducing atmosphere which are about five times higher than those of pure SrFe0.9Ti0.1O3-δ. In terms of conductivity and redox stability, it is a potential redox stable electrode material for reversible and symmetrical solid oxide fuel cells as well.

AB - New perovskite oxides SrFe0.7TM0.2Ti0.1O3-δ (TM = Mn, Fe, Co, Ni, Cu) were synthesised by sol-gel processes. Their redox stability and conductivity in both air and 5%H2/Ar were investigated in details. The cubic perovskite structure was also observed for all dopants with variation in the lattice parameters associated with different dopant environments and charge compensation mechanisms. Improvement of the electronic conductivity over SrFe0.9Ti0.1O3-δ was observed for all dopants in air, attributed to increasing charge carrier concentrations. Reduction in 5% H2/Ar exhibited minimal a material properties for SrFe0.7Cu0.2Ti0.1O3-δ, with a significant reduction in conductivity was observed for SrFe0.7Mn0.2Ti0.1O3-δ. All doped compounds exhibited a single phase cubic perovskite structure after reduction in 5%H2/Ar at 700 °C with the exception of SrFe0.7Ni0.2Ti0.1O3-δ and SrFe0.7Co0.2Ti0.1O3-δ which displays secondary nickel and cobalt phases respectively upon reduction. SrFe0.7Cu0.2Ti0.1O3-δ is redox stable at a temperature below 700 °C and highly conductive with conductivities around 10 S cm− 1 in both air and reducing atmosphere which are about five times higher than those of pure SrFe0.9Ti0.1O3-δ. In terms of conductivity and redox stability, it is a potential redox stable electrode material for reversible and symmetrical solid oxide fuel cells as well.

KW - conductivity

KW - pPerovskite

KW - redox stable

KW - solid oxide fuel cell

KW - strontium ferrite

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