Polarization resistance and composite cathode of Ce doped SrMnO3 system for intermediate temperature solid oxide fuel cells

Ryu, Jong-Sik; O’Hayre, Ryan; Lee, Heesoo

doi:10.1016/j.ssi.2014.03.017

Cited by 10 publications

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“…4 The increase in R p is associated with a decrease in oxygen vacancy concentration and mobility, due to the strong hybridization between the Ce 4f/5d and oxygen 2p orbitals and an increase in the MnO 6 structural distortion, respectively. 5,6 We have investigated Sr 0.9 Ce 0.1 Mn 1-x Co x O 3-δ (SCMCo) to enhance the oxygen vacancy concentration and have identified the lower R p because of the increase in oxygen vacancy, which is a result of the mixed valence state of cobalt ions. 7 It is reported that BO 6 octahedral distortion can occur in most perovskite oxides (expressed as ABO 3 ) because of formation of oxygen vacancy and difference in ionic radii, which is occurred by temperature and mixed valence state changes of the transition metals.…”

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confidence: 99%

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Ryu

Noh²,

Kim

et al. 2016

J. Electrochem. Soc.

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The relaxation mechanism of the octahedral distortion in Sr 0.9 Ce 0.1 Mn 1-x Co x O 3-δ (SCMCo) as a function of the cobalt content and temperature, and the electrochemical properties of the SCMCo-SDC composite cathodes were investigated. Substituted cobalt ions and manganese ions were in a mixed valence state consisting of Co 3+ /Co 2+ and Mn 4+ /Mn 3+ , respectively. The Co K-edges were shifted toward low energy by an increase in the Co content, which indicates that Co 3+ (0.55 Å) is reduced to Co 2+ (0.65 Å). The decrease in the difference in ionic radii between B-site elements relieved the octahedral distortion as confirmed by a decrease in the peak intensity in the Fourier transformed EXAFS of the Co K-edge. The lattice volume increased up to 1.4 and 1.9 vol.% with Co content and temperature, respectively. The Co-O bond angle was closer to 180 • C with an increase in Co content thereby leading to an increase in the oxygen ion conductivity. Therefore, the relaxation of the distortion by substitution of cobalt ions should affect the improvement in the oxygen mobility. The polarization resistances of the SCMCo-SDC composite cathodes at 650 • C were decreased up to four times with an increase in the cobalt content, and the power densities of the single cells (Ni-SDC/SDC/SCMCo-SDC) were also enhanced up to 177% with increasing cobalt content. However, the polarization resistance (R p ) can be increased through doping of cerium ions for structural stability and enhancement of the electrical conductivity. 4 The increase in R p is associated with a decrease in oxygen vacancy concentration and mobility, due to the strong hybridization between the Ce 4f/5d and oxygen 2p orbitals and an increase in the MnO 6 structural distortion, respectively. 5,6 We have investigated Sr 0.9 Ce 0.1 Mn 1-x Co x O 3-δ (SCMCo) to enhance the oxygen vacancy concentration and have identified the lower R p because of the increase in oxygen vacancy, which is a result of the mixed valence state of cobalt ions. 7 It is reported that BO 6 octahedral distortion can occur in most perovskite oxides (expressed as ABO 3 ) because of formation of oxygen vacancy and difference in ionic radii, which is occurred by temperature and mixed valence state changes of the transition metals. 6,8,9 Lattice changes attributed by the oxygen vacancy with elevated temperature can affect the conduction path for oxygen vacancies as a geometrical factor. 10 The difference in the ionic radii induced by the valence change of transition metals in the B-site is also another factor contributing to BO 6 distortion. We hypothesize that the difference in the ionic radius between cobalt ions and Mn ion in SCMCo has an effect on the octahedral change of BO 6 because cobalt ion has a stronger self-reduction property from Co 3+ to Co 2+ relative to other transition metal ions at elevating temperature. Therefore, the conduction properties of oxygen vacancies are a result of Co doping, in terms of the carrier mobility, based on the investigation of the effects of temperature and t...

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Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Ryu

Noh²,

Kim

et al. 2016

J. Electrochem. Soc.

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“…For instance, high cathode porosity and low tortuosity facilitated molecular oxygen diffusion and resulted in the reduced cathode polarisation resistance. Wang et al [92] reported that the agglomeration of particles in La0.8Sr0.2MnO3 caused the reduction in the triple phase boundary between the cathode and electrolyte and subsequently raised the cathode polarisation resistance. Another significant factor is the decreased oxygen vacancy concentration.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells

Kamlungsua

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Layered perovskites, Sr4Fe6O13, LaxSr4-xFe6O13, PrxSr4-xFe6O13, Smx Sr4-xFe6O13, Sr4CoxFe6-xO13, and Sr4NixFe6-xO13 have been investigated as cathode materials for intermediate – temperature solid oxide fuel cell (IT-SOFC). All layered oxides were prepared through conventional solid – state reaction method with the respective calcination and sintering temperatures of 850oC for 16 hours and 1185oC for 5 hours and they exhibited a gradual phase transformation from the pure layered phase to the perovskite phase with increasing the dopant content. In addition, the incorporation of Pr, Sm, and Co led to the increasing of electrical conductivity in PSFx, SSFx, and SFCox oxides whereas doping of La and Ni resulted in the transition in electrical conduction from semiconducting to metallic – like behaviours for LSFx and SFNix oxides. XPS analyses and thermogravimetric analyses revealed the different charge compensation mechanisms in lanthanide – and transition metal – containing oxides. The reduction in polarisation resistances with the increased dopant concentration was also observed, in general, for all oxides. The increase in the electrical conductivity and the decrease of the polarisation resistance of the synthesised oxides with increasing the dopant concentration have stemmed from the synergistic effect on the presence of both perovskite and layered phases that provided fast oxide ion diffusion channels and acted as a continuous network for electron transport.

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RETRACTED ARTICLE: Structural, dielectric and electrical properties of cerium-modified strontium manganite ceramics

Achary

Behera

Choudhary

et al. 2021

J Mater Sci: Mater Electron

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Polarization resistance and composite cathode of Ce doped SrMnO3 system for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 11 publications

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells

RETRACTED ARTICLE: Structural, dielectric and electrical properties of cerium-modified strontium manganite ceramics

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Polarization resistance and composite cathode of Ce doped SrMnO3 system for intermediate temperature solid oxide fuel cells

Cited by 10 publications

References 11 publications

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr0.9Ce0.1MnO3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr0.9Ce0.1MnO3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells

RETRACTED ARTICLE: Structural, dielectric and electrical properties of cerium-modified strontium manganite ceramics

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Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells

Lattice Relaxation and Electrochemical Performances of Cobalt-Doped Sr_0.9Ce_0.1MnO_3-δComposite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells