fulltext.study @t Gmail

Ce-doped strontium cobalt ferrite perovskites as cathode catalysts for solid oxide fuel cells: Effect of dopant concentration

Paper ID Volume ID Publish Year Pages File Format Full-Text
46294 46436 2012 6 PDF Available
Title
Ce-doped strontium cobalt ferrite perovskites as cathode catalysts for solid oxide fuel cells: Effect of dopant concentration
Abstract

The bulk structure, oxygen mobility, and button cell performance of perovskite-type oxides with the formula Sr1−xCexCo0.2Fe0.8O3−δ for x = 0.10, 0.15, and 0.20 have been investigated using in situ X-ray diffraction (XRD), oxygen temperature-programmed desorption (O2-TPD), CO2-temperature-programmed oxidation (TPO) and button cell/impedance measurements. XRD results indicate that cerium-doped perovskites have a cubic structure and do not undergo structural changes with increasing temperature. An additional CeO2 phase was observed when the concentration of Ce exceeded 15%. Addition of cerium lowers the thermal expansion coefficient (TEC), bringing the TEC closer to that of gadolinia-doped ceria (GDC) electrolyte. The oxygen vacancy generation was inversely proportional to the doping concentration of Ce. However, the best unit cell performance and the lowest impedance were achieved with intermediate levels of Ce doping, suggesting that the ceria phase which segregates at higher doping levels has a detrimental effect on the cell performance. CO2-TPO experiments which were used to examine the rate of intra-facial transport of oxygen were found to be a good probe for button cell performance.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The ORR activity of cerium-doped SrCo(Fe)O3 perovskites was investigated. ► CeO2 was seen to segregate when the amount of cerium doped exceeded 15% in the A-site. ► Desorption and intra-facial transport of oxygen were studied by O2-TPD and CO2-TPO. ► SrCo(Fe)O3 perovskites doped with Intermediate levels of cerium show potential as SOFC cathodes.

Keywords
SOFC; Perovskite; O2-TPD; CO2-TPO; Impedance; Cathode; Oxygen reduction
First Page Preview
Ce-doped strontium cobalt ferrite perovskites as cathode catalysts for solid oxide fuel cells: Effect of dopant concentration
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 336–341
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us