Effect of cobalt on the activity of dual phase “(Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ” SOFC cathodes

K. Kammer Hansen*, R. Sažinas

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effect of the amount of cobalt in (Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ solid oxide fuel cell (SOFC) cathodes (x = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) was studied by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry, four-point DC conductivity measurements, cone-shaped electrodes, and electrochemical impedance spectroscopy (EIS). XRD and scanning electron microscopy revealed two phases: a cubic phase and an orthorhombic phase. One phase has a small particle size (cubic phase), and the other phase (orthorhombic) has a larger particle size. Dilatometry indicated that the thermal expansion coefficient increased with increasing Co content. The electrical conductivity maximum for the Co-rich compound was found to have a value of 82 S cm−1 at approximately 300 °C. It was shown that the activity of the cathodes was strongly dependent on the amount of cobalt. The highest activity was found for the cobalt-rich compound (Gd0.6Sr0.4)0.99Fe0.75Co0.25O3-δ with an area-specific resistance of 0.9 Ωcm2 at 600 °C, measured on a cone-shaped electrode in air.
Original languageEnglish
JournalJournal of Solid State Electrochemistry
Volume23
Issue number3
Pages (from-to)965-970
Number of pages6
ISSN1432-8488
DOIs
Publication statusPublished - 2019

Cite this

@article{6f70d8d44b5f4cbc8b96114fd6f7b2e1,
title = "Effect of cobalt on the activity of dual phase “(Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ” SOFC cathodes",
abstract = "The effect of the amount of cobalt in (Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ solid oxide fuel cell (SOFC) cathodes (x = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) was studied by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry, four-point DC conductivity measurements, cone-shaped electrodes, and electrochemical impedance spectroscopy (EIS). XRD and scanning electron microscopy revealed two phases: a cubic phase and an orthorhombic phase. One phase has a small particle size (cubic phase), and the other phase (orthorhombic) has a larger particle size. Dilatometry indicated that the thermal expansion coefficient increased with increasing Co content. The electrical conductivity maximum for the Co-rich compound was found to have a value of 82 S cm−1 at approximately 300 °C. It was shown that the activity of the cathodes was strongly dependent on the amount of cobalt. The highest activity was found for the cobalt-rich compound (Gd0.6Sr0.4)0.99Fe0.75Co0.25O3-δ with an area-specific resistance of 0.9 Ωcm2 at 600 °C, measured on a cone-shaped electrode in air.",
author = "{Kammer Hansen}, K. and R. Sažinas",
year = "2019",
doi = "10.1007/s10008-019-04201-z",
language = "English",
volume = "23",
pages = "965--970",
journal = "Journal of Solid State Electrochemistry",
issn = "1432-8488",
publisher = "Springer",
number = "3",

}

Effect of cobalt on the activity of dual phase “(Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ” SOFC cathodes. / Kammer Hansen, K.; Sažinas, R.

In: Journal of Solid State Electrochemistry, Vol. 23, No. 3, 2019, p. 965-970.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of cobalt on the activity of dual phase “(Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ” SOFC cathodes

AU - Kammer Hansen, K.

AU - Sažinas, R.

PY - 2019

Y1 - 2019

N2 - The effect of the amount of cobalt in (Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ solid oxide fuel cell (SOFC) cathodes (x = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) was studied by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry, four-point DC conductivity measurements, cone-shaped electrodes, and electrochemical impedance spectroscopy (EIS). XRD and scanning electron microscopy revealed two phases: a cubic phase and an orthorhombic phase. One phase has a small particle size (cubic phase), and the other phase (orthorhombic) has a larger particle size. Dilatometry indicated that the thermal expansion coefficient increased with increasing Co content. The electrical conductivity maximum for the Co-rich compound was found to have a value of 82 S cm−1 at approximately 300 °C. It was shown that the activity of the cathodes was strongly dependent on the amount of cobalt. The highest activity was found for the cobalt-rich compound (Gd0.6Sr0.4)0.99Fe0.75Co0.25O3-δ with an area-specific resistance of 0.9 Ωcm2 at 600 °C, measured on a cone-shaped electrode in air.

AB - The effect of the amount of cobalt in (Gd0.6Sr0.4)0.99Fe1-xCoxO3-δ solid oxide fuel cell (SOFC) cathodes (x = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) was studied by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), dilatometry, four-point DC conductivity measurements, cone-shaped electrodes, and electrochemical impedance spectroscopy (EIS). XRD and scanning electron microscopy revealed two phases: a cubic phase and an orthorhombic phase. One phase has a small particle size (cubic phase), and the other phase (orthorhombic) has a larger particle size. Dilatometry indicated that the thermal expansion coefficient increased with increasing Co content. The electrical conductivity maximum for the Co-rich compound was found to have a value of 82 S cm−1 at approximately 300 °C. It was shown that the activity of the cathodes was strongly dependent on the amount of cobalt. The highest activity was found for the cobalt-rich compound (Gd0.6Sr0.4)0.99Fe0.75Co0.25O3-δ with an area-specific resistance of 0.9 Ωcm2 at 600 °C, measured on a cone-shaped electrode in air.

U2 - 10.1007/s10008-019-04201-z

DO - 10.1007/s10008-019-04201-z

M3 - Journal article

VL - 23

SP - 965

EP - 970

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

SN - 1432-8488

IS - 3

ER -