Cristin-resultat-ID: 1686222
Sist endret: 16. januar 2020, 11:31
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Processing of high performance composite cathodes for protonic ceramic fuel cells by exsolution

Bidragsytere:
  • Laura Rioja-Monllor
  • Carlos Bernuy-Lopez
  • Marie-Laure Fontaine
  • Tor Grande og
  • Mari-Ann Einarsrud

Tidsskrift

Journal of Materials Chemistry A
ISSN 2050-7488
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Volum: 7
Hefte: 14
Sider: 8609 - 8619
Open Access

Importkilder

Scopus-ID: 2-s2.0-85063936196

Beskrivelse Beskrivelse

Tittel

Processing of high performance composite cathodes for protonic ceramic fuel cells by exsolution

Sammendrag

La0.5Ba0.5CoO3-δ-BaZrO3 (LB-BZ)-based composite materials were prepared by a modified Pechini sol-gel method combined with exsolution. Two different LB-BZ composites were prepared through two alternative thermal treatments of the precursor gel. A metastable single phase with perovskite crystal structure was first obtained upon annealing the precursor in inert atmosphere, which further transformed to a two-phase composite by in situ exsolution in air. Comparetively, direct calcination of the LB-BZ gel in air resulted in a two-phase composite with different microstructure and composition of the two phases. The composite cathode formed by exsolution consisted of a matrix of BZ-phase with ~45 nm grain size embedding ~20 nm grains of LB-phase, while the composite cathode obtained by direct calcination consisted of a mixture of both phases with 50-60 nm grain size. Electrodes of symmetric half-cells were spray-coated on BaZr0.9Y0.1O2.95 electrolytes to examine the electrochemical performance by impedance spectroscopy. The lowest area specific resistance (ASR) was obtained for the composite cathode produced by exsolution with an excellent ASR of 1.54 Ω cm2 at 600 °C, 18 Ω cm2 at 400 °C and an activation energy (Ea) of 0.60 eV in 3 % moist synthetic air. This work demonstrates the potential of fabricating high performance nanocomposite cathodes with tailored chemical composition by a novel exsolution method.

Bidragsytere

Laura Rioja-Monllor

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Carlos Bernuy-Lopez

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Marie-Laure Fontaine

  • Tilknyttet:
    Forfatter
    ved Bærekraftig energiteknologi ved SINTEF AS

Tor Grande

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Mari-Ann Einarsrud

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
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