Characterization of perovskite-type cathode, La0.75Sr0.25 Mn0.95-xCox Ni0.05O3+δ (0.1 ≤ x ≤ 0.3), for intermediate-temperature solid oxide fuel cells

Ravindra K. Gupta, Ik Jin Choi, Yong Soo Cho, Hong Lim Lee, Sang Hoon Hyun

Research output: Contribution to journalArticle

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Abstract

Phase evolution, structure, thermal property, morphology, electrical property and reactivity of a perovskite-type cathode system, La0.75Sr0.25 Mn0.95-xCoxNi0.05O3+δ (0.1 ≤ x ≤ 0.3), are reported. The samples are synthesized using metal acetates by the Pechini method. A perovskite-type phase is formed after calcination at ∼700 °C and a rhombohedral symmetry of R - 3c space group is stabilized at ∼1100 °C. An increase in x decreases the unit cell volume linearly, accompanying with a linear decrease in bond lengths and tilt angle. The differential thermal analysis suggests the phase stabilization for a temperature range, 50-1100 °C. The thermo-gravimetric, thermal expansion, and electrical and ionic conductivities studies suggest presence of a Jahn-Teller transition at ∼260-290 °C. The samples with x = 0.1 mol exhibit electrical conductivity of ∼55 S cm-1 at ∼600 °C, activation energy of ∼0.13 eV, coefficient of thermal expansion of ∼12 × 106 °C-1, crystallite size of ∼45 nm, Brunauer-Emmett-Teller (BET) surface area of 1.26 m2 g-1 and average particle size of ∼0.9 μm. A fairly high ionic conductivity, 5-9 × 10-2 S cm-1 makes the sample with x = 0.1 mole suitable for intermediate-temperature solid oxide fuel cell cathode applications. The experimental results are discussed with the help of the defect models proposed for La1-xSrxMnO3+δ.

Original languageEnglish
Pages (from-to)371-377
Number of pages7
JournalJournal of Power Sources
Volume187
Issue number2
DOIs
Publication statusPublished - 2009 Feb 15

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Ionic conductivity
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Perovskite
Thermal expansion
Cathodes
cathodes
ion currents
thermal expansion
Bond length
Crystallite size
Calcination
Differential thermal analysis
cell cathodes
Acetates
Electric properties
electrical resistivity
Thermodynamic properties
Stabilization
Activation energy

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Characterization of perovskite-type cathode, La0.75Sr0.25 Mn0.95-xCox Ni0.05O3+δ (0.1 ≤ x ≤ 0.3), for intermediate-temperature solid oxide fuel cells",
abstract = "Phase evolution, structure, thermal property, morphology, electrical property and reactivity of a perovskite-type cathode system, La0.75Sr0.25 Mn0.95-xCoxNi0.05O3+δ (0.1 ≤ x ≤ 0.3), are reported. The samples are synthesized using metal acetates by the Pechini method. A perovskite-type phase is formed after calcination at ∼700 °C and a rhombohedral symmetry of R - 3c space group is stabilized at ∼1100 °C. An increase in x decreases the unit cell volume linearly, accompanying with a linear decrease in bond lengths and tilt angle. The differential thermal analysis suggests the phase stabilization for a temperature range, 50-1100 °C. The thermo-gravimetric, thermal expansion, and electrical and ionic conductivities studies suggest presence of a Jahn-Teller transition at ∼260-290 °C. The samples with x = 0.1 mol exhibit electrical conductivity of ∼55 S cm-1 at ∼600 °C, activation energy of ∼0.13 eV, coefficient of thermal expansion of ∼12 × 106 °C-1, crystallite size of ∼45 nm, Brunauer-Emmett-Teller (BET) surface area of 1.26 m2 g-1 and average particle size of ∼0.9 μm. A fairly high ionic conductivity, 5-9 × 10-2 S cm-1 makes the sample with x = 0.1 mole suitable for intermediate-temperature solid oxide fuel cell cathode applications. The experimental results are discussed with the help of the defect models proposed for La1-xSrxMnO3+δ.",
author = "Gupta, {Ravindra K.} and Choi, {Ik Jin} and Cho, {Yong Soo} and Lee, {Hong Lim} and Hyun, {Sang Hoon}",
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Characterization of perovskite-type cathode, La0.75Sr0.25 Mn0.95-xCox Ni0.05O3+δ (0.1 ≤ x ≤ 0.3), for intermediate-temperature solid oxide fuel cells. / Gupta, Ravindra K.; Choi, Ik Jin; Cho, Yong Soo; Lee, Hong Lim; Hyun, Sang Hoon.

In: Journal of Power Sources, Vol. 187, No. 2, 15.02.2009, p. 371-377.

Research output: Contribution to journalArticle

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T1 - Characterization of perovskite-type cathode, La0.75Sr0.25 Mn0.95-xCox Ni0.05O3+δ (0.1 ≤ x ≤ 0.3), for intermediate-temperature solid oxide fuel cells

AU - Gupta, Ravindra K.

AU - Choi, Ik Jin

AU - Cho, Yong Soo

AU - Lee, Hong Lim

AU - Hyun, Sang Hoon

PY - 2009/2/15

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N2 - Phase evolution, structure, thermal property, morphology, electrical property and reactivity of a perovskite-type cathode system, La0.75Sr0.25 Mn0.95-xCoxNi0.05O3+δ (0.1 ≤ x ≤ 0.3), are reported. The samples are synthesized using metal acetates by the Pechini method. A perovskite-type phase is formed after calcination at ∼700 °C and a rhombohedral symmetry of R - 3c space group is stabilized at ∼1100 °C. An increase in x decreases the unit cell volume linearly, accompanying with a linear decrease in bond lengths and tilt angle. The differential thermal analysis suggests the phase stabilization for a temperature range, 50-1100 °C. The thermo-gravimetric, thermal expansion, and electrical and ionic conductivities studies suggest presence of a Jahn-Teller transition at ∼260-290 °C. The samples with x = 0.1 mol exhibit electrical conductivity of ∼55 S cm-1 at ∼600 °C, activation energy of ∼0.13 eV, coefficient of thermal expansion of ∼12 × 106 °C-1, crystallite size of ∼45 nm, Brunauer-Emmett-Teller (BET) surface area of 1.26 m2 g-1 and average particle size of ∼0.9 μm. A fairly high ionic conductivity, 5-9 × 10-2 S cm-1 makes the sample with x = 0.1 mole suitable for intermediate-temperature solid oxide fuel cell cathode applications. The experimental results are discussed with the help of the defect models proposed for La1-xSrxMnO3+δ.

AB - Phase evolution, structure, thermal property, morphology, electrical property and reactivity of a perovskite-type cathode system, La0.75Sr0.25 Mn0.95-xCoxNi0.05O3+δ (0.1 ≤ x ≤ 0.3), are reported. The samples are synthesized using metal acetates by the Pechini method. A perovskite-type phase is formed after calcination at ∼700 °C and a rhombohedral symmetry of R - 3c space group is stabilized at ∼1100 °C. An increase in x decreases the unit cell volume linearly, accompanying with a linear decrease in bond lengths and tilt angle. The differential thermal analysis suggests the phase stabilization for a temperature range, 50-1100 °C. The thermo-gravimetric, thermal expansion, and electrical and ionic conductivities studies suggest presence of a Jahn-Teller transition at ∼260-290 °C. The samples with x = 0.1 mol exhibit electrical conductivity of ∼55 S cm-1 at ∼600 °C, activation energy of ∼0.13 eV, coefficient of thermal expansion of ∼12 × 106 °C-1, crystallite size of ∼45 nm, Brunauer-Emmett-Teller (BET) surface area of 1.26 m2 g-1 and average particle size of ∼0.9 μm. A fairly high ionic conductivity, 5-9 × 10-2 S cm-1 makes the sample with x = 0.1 mole suitable for intermediate-temperature solid oxide fuel cell cathode applications. The experimental results are discussed with the help of the defect models proposed for La1-xSrxMnO3+δ.

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