2016
DOI: 10.1149/2.1121608jes
|View full text |Cite
|
Sign up to set email alerts
|

A Broad Stability Investigation of Nb-Doped SrCoO2.5+δas a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Abstract: The present work reports a systematic study on the structural, thermal, electrical and electrochemical stability of SrCo1−xNbxO2.5+δ series as a potential reversible oxygen-electrode for intermediate-temperature solid oxide fuel cells. The identified best composition is x = 0.10, which exhibits a stable pseudo primitive cubic structure at <700°C and a reversible oxygen redox reaction at 350°C. The conductivity of this material is p-type and also exhibits a peak at 350°C, implying that the electron hole conduct… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

5
31
0

Year Published

2017
2017
2023
2023

Publication Types

Select...
6

Relationship

1
5

Authors

Journals

citations
Cited by 40 publications
(36 citation statements)
references
References 50 publications
5
31
0
Order By: Relevance
“…At elevated temperatures, e.g. >300 o C, these oxygen-ordered superlattice structures tend to transform into a single-phase oxygen-disordered perovskite pseudo-cubic unit cell as revealed by our early high-temperature XRD examination 35 .…”
Section: Phase Compositionmentioning
confidence: 74%
See 2 more Smart Citations
“…At elevated temperatures, e.g. >300 o C, these oxygen-ordered superlattice structures tend to transform into a single-phase oxygen-disordered perovskite pseudo-cubic unit cell as revealed by our early high-temperature XRD examination 35 .…”
Section: Phase Compositionmentioning
confidence: 74%
“…where, N A is the Avogadro constant, 6.02×10 23 (mol -1 ); a is the lattice constant of a pseudo-cubic SCN (with 10mol%Nb doping) is 3.90 Å 35 . According to prior studies, Co-3d orbital and O-2p orbital tend to hybridize strongly in SCO systems 21,32 , producing a broad conduction band.…”
Section: Structural Illustration Of Oxygen Interstitials In Donor-dopmentioning
confidence: 99%
See 1 more Smart Citation
“…The reduction of cobalt valance state as the temperature was also observed in the Ta-doped SrCoO 3 by Wang 57 , where the average cobalt valance state decreased from 3.25 at 300°C to 3.00 at 600°C. This also happened for Nb-doped SrCoO 2.5 + δ 58 .…”
Section: Resultsmentioning
confidence: 57%
“…From Figure B, it was clear that the conductivities increased with increasing oxygen pressure at all testing temperatures, revealing the p‐type electron hole ( h • ) conduction. The formation of lattice oxygen and oxidation of cobalt to electron holes may be explained through the oxygen‐ingestion on the oxygen vacancy, via the following equilibrium and its constant K ep : normalVO+12O2normalO×O+2h, Kep=h2[]O×normalOPnormalO21/2[]VnormalO, []normalVnormalO=2[]normalh. …”
Section: Resultsmentioning
confidence: 99%