Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates

Christophe T G Petit, Shanwen Tao

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates have been investigated. Relative densities >98 % have been achieved after sintering at 1400 °C or 1500 °C for only 1 h. All studied compounds are stable in ambient air up to the measured 900 °C and, in reducing atmosphere (both wet and dry 5 % H2-Ar) up to the measured 800 °C. The Co-free sample (BaCe0.7Y0.2Pr0.1O3-δ) exhibits the highest conductivity of 1.21 × 10-2 S cm-1 at 700 °C in air while the corresponding cobalt containing sample (BaCe0.7Y0.175Pr0.1Co0.025O3-δ) has a conductivity of 9.85 × 10-3 S cm-1 at 700 °C in air. Cobalt addition allows the ability to retain much larger amounts of water to be retained as suggested by the higher conductivities obtained in wet hydrogen compared to the values in dry reducing atmosphere. This latter phenomenon is of special interest as it suggests the possibility of higher ionic conductivities in water-containing atmosphere and would benefit to intermediate- and high-temperature solid oxide fuel cells and/or electrolysers. The thermal expansion coefficients for the Co-free and Co-containing samples were around 12.0 × 10-6 K-1 between 25 and 1000 °C.

LanguageEnglish
JournalJournal of Electroceramics
DOIs
Publication statusAccepted/In press - 2 Apr 2014

Fingerprint

Praseodymium
Yttrium
praseodymium
Barium
Cobalt
yttrium
barium
Structural properties
Electric properties
cobalt
Thermodynamic properties
thermodynamic properties
electrical properties
atmospheres
conductivity
air
Air
Water
Ionic conductivity
solid oxide fuel cells

Keywords

  • barium cerate
  • cobalt doping
  • proton conductor
  • stability
  • thermal expansion

Cite this

@article{7dac45c29c9842acab79ea901adb5804,
title = "Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates",
abstract = "Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates have been investigated. Relative densities >98 {\%} have been achieved after sintering at 1400 °C or 1500 °C for only 1 h. All studied compounds are stable in ambient air up to the measured 900 °C and, in reducing atmosphere (both wet and dry 5 {\%} H2-Ar) up to the measured 800 °C. The Co-free sample (BaCe0.7Y0.2Pr0.1O3-δ) exhibits the highest conductivity of 1.21 × 10-2 S cm-1 at 700 °C in air while the corresponding cobalt containing sample (BaCe0.7Y0.175Pr0.1Co0.025O3-δ) has a conductivity of 9.85 × 10-3 S cm-1 at 700 °C in air. Cobalt addition allows the ability to retain much larger amounts of water to be retained as suggested by the higher conductivities obtained in wet hydrogen compared to the values in dry reducing atmosphere. This latter phenomenon is of special interest as it suggests the possibility of higher ionic conductivities in water-containing atmosphere and would benefit to intermediate- and high-temperature solid oxide fuel cells and/or electrolysers. The thermal expansion coefficients for the Co-free and Co-containing samples were around 12.0 × 10-6 K-1 between 25 and 1000 °C.",
keywords = "barium cerate, cobalt doping, proton conductor, stability, thermal expansion",
author = "Petit, {Christophe T G} and Shanwen Tao",
year = "2014",
month = "4",
day = "2",
doi = "10.1007/s10832-014-9910-8",
language = "English",
journal = "Journal of Electroceramics",
issn = "1385-3449",

}

Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates. / Petit, Christophe T G; Tao, Shanwen.

In: Journal of Electroceramics, 02.04.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates

AU - Petit, Christophe T G

AU - Tao, Shanwen

PY - 2014/4/2

Y1 - 2014/4/2

N2 - Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates have been investigated. Relative densities >98 % have been achieved after sintering at 1400 °C or 1500 °C for only 1 h. All studied compounds are stable in ambient air up to the measured 900 °C and, in reducing atmosphere (both wet and dry 5 % H2-Ar) up to the measured 800 °C. The Co-free sample (BaCe0.7Y0.2Pr0.1O3-δ) exhibits the highest conductivity of 1.21 × 10-2 S cm-1 at 700 °C in air while the corresponding cobalt containing sample (BaCe0.7Y0.175Pr0.1Co0.025O3-δ) has a conductivity of 9.85 × 10-3 S cm-1 at 700 °C in air. Cobalt addition allows the ability to retain much larger amounts of water to be retained as suggested by the higher conductivities obtained in wet hydrogen compared to the values in dry reducing atmosphere. This latter phenomenon is of special interest as it suggests the possibility of higher ionic conductivities in water-containing atmosphere and would benefit to intermediate- and high-temperature solid oxide fuel cells and/or electrolysers. The thermal expansion coefficients for the Co-free and Co-containing samples were around 12.0 × 10-6 K-1 between 25 and 1000 °C.

AB - Effects of cobalt addition on structural, thermal and electrical properties of praseodymium-yttrium co-doped barium cerates have been investigated. Relative densities >98 % have been achieved after sintering at 1400 °C or 1500 °C for only 1 h. All studied compounds are stable in ambient air up to the measured 900 °C and, in reducing atmosphere (both wet and dry 5 % H2-Ar) up to the measured 800 °C. The Co-free sample (BaCe0.7Y0.2Pr0.1O3-δ) exhibits the highest conductivity of 1.21 × 10-2 S cm-1 at 700 °C in air while the corresponding cobalt containing sample (BaCe0.7Y0.175Pr0.1Co0.025O3-δ) has a conductivity of 9.85 × 10-3 S cm-1 at 700 °C in air. Cobalt addition allows the ability to retain much larger amounts of water to be retained as suggested by the higher conductivities obtained in wet hydrogen compared to the values in dry reducing atmosphere. This latter phenomenon is of special interest as it suggests the possibility of higher ionic conductivities in water-containing atmosphere and would benefit to intermediate- and high-temperature solid oxide fuel cells and/or electrolysers. The thermal expansion coefficients for the Co-free and Co-containing samples were around 12.0 × 10-6 K-1 between 25 and 1000 °C.

KW - barium cerate

KW - cobalt doping

KW - proton conductor

KW - stability

KW - thermal expansion

UR - http://www.scopus.com/inward/record.url?scp=84897117586&partnerID=8YFLogxK

U2 - 10.1007/s10832-014-9910-8

DO - 10.1007/s10832-014-9910-8

M3 - Article

JO - Journal of Electroceramics

T2 - Journal of Electroceramics

JF - Journal of Electroceramics

SN - 1385-3449

ER -