Composite electrolyte based on nanostructured Ce0.8Sm0.2O1.9 (SDC) for low-temperature solid oxide fuel cells
2009 (English)In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 33, no 13, 1138-1144 p.Article in journal (Refereed) Published
Nanostructured Ce0.8Sm0.2O1.9 (SDC) is investigated for low-temperature solid oxide fuel cells based on SDC- 30 wt% (53 mol% Li2CO3:47 mol % Na2CO3) composite electrolyte in this work. SDC is prepared by the combined citrate and EDTA complexing method. X-ray powder diffraction shows that it forms a well-cubic fluorite structure after being sintered at 700 degrees C for 2 h. The particle is about 12 nm detected by the transmission electron microscopy. Conductivity for the composite is much higher than the pure SDC at comparable temperatures. A transition of ionic conductivity occurs at 450 degrees C for the composite electrolyte. The single cells are fabricated by a simple dry-pressing process and tested at 450-600 degrees C. A maximum power density of 900 mW cm(-2) and the open-circuit voltage of 0.92 V are achieved at 600 degrees C. The conduction mechanism has been discussed by comparing the conductivity of composite electrolyte under different conditions. AC impedance for single cell indicates that the electrochemical process involving cathode and anode reactions is the rate-limiting step.
Place, publisher, year, edition, pages
2009. Vol. 33, no 13, 1138-1144 p.
low-temperature solid oxide fuel cell, nanostructure, Ce0.8Sm0.2O1.9 (SDC), composite electrolyte
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-32330DOI: 10.1002/er.1597ISI: 000271066600005ScopusID: 2-s2.0-70349614791OAI: oai:DiVA.org:kth-32330DiVA: diva2:410105
QC 201104122011-04-122011-04-122011-04-12Bibliographically approved