Understanding the electrochemical mechanism of the core-shell ceria-LiZnO nanocomposite in a low temperature solid oxide fuel cell
2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2, no 15, 5399-5407 p.Article in journal (Refereed) Published
Ceria based solid solutions have been considered some of the best candidates to develop intermediate/low temperature solid oxide fuel cells (IT/LT-SOFCs, 600-800 degrees C). However, the barrier to commercialization has not been overcome even after numerous research activities due to its inherent electronic conduction in a reducing atmosphere and inadequate ionic conductivity at low temperatures. The present work reports a new type of all-oxide nanocomposite electrolyte material based on a semiconductor, Li-doped ZnO (LixZnO), and an ionic conductor, samarium doped ceria (SDC). This electrolyte exhibits superionic conductivity (>0.1 S cm(-1) over 300 degrees C), net-electron free and excellent electrolytic performances (400-630 mW cm(-2)) between 480 and 550 degrees C. Particularly, defects related to interfacial conduction and the intrinsic and extrinsic properties of ions are analysed. An internal or interfacial redox process on two-phase particles is suggested as a powerful methodology to overcome the internal short-circuit problem of ceria-based single phase materials and to develop new advanced materials for energy related applications. The combination of the above promising features makes the SDC-LiZnO nanocomposite a promising electrolyte for LTSOFCs.
Place, publisher, year, edition, pages
2014. Vol. 2, no 15, 5399-5407 p.
Electrolytes, Ionic conductivity, Lithium, Nanocomposites, Zinc oxide, Electrochemical mechanisms, Electronic conduction, Low temperature solid oxide fuel cells, Nanocomposite electrolytes, Reducing atmosphere, Samarium doped cerias, Single-phase materials, Superionic conductivity
IdentifiersURN: urn:nbn:se:kth:diva-144571DOI: 10.1039/c3ta14098aISI: 000333101600030ScopusID: 2-s2.0-84896474446OAI: oai:DiVA.org:kth-144571DiVA: diva2:713950
FunderSwedish Research Council, 621-2011-4983Vinnova, P36545-1EU, FP7, Seventh Framework Programme, 303454
QC 201404242014-04-242014-04-242014-04-24Bibliographically approved