Isovalent doping: a new strategy to suppress surface Sr segregation of the perovskite O2-electrode for solid oxide fuel cells

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 71
  • Download : 0
Surface Sr segregation and phase separation are the key reasons behind the chemical instability of Sr-containing perovskite oxide surfaces and the corresponding performance degradation of solid oxide fuel cell O-2-electrodes, but to date, practical solutions to prevent this phenomenon are limited. Here, we investigate how isovalent doping (in this case, Zr substitution of Ti) changes the surface morphology, chemical composition, and thus the O(2)activation kinetics under actual operating conditions. Thin films of SrTi(0.5)Fe(0.5)O(3-delta)as a representative model perovskite O-2-electrode, with Zr doping, are fabricatedviapulsed laser deposition and their surface oxygen exchange rates are then characterizedviaelectrical conductivity relaxation assessments. Zr dopants strengthen the Sr-O bonds in the oxide lattice, inhibiting the formation of surface SrO(x)clusters and significantly reducing the deterioration of the oxygen exchange rates compared to the results from undoped film at 650 degrees C for 30 h. These observations suggest a new strategy for ensuring the surface stability of Sr-containing perovskite oxides for fuel cell O-2-electrodes.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-07
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.27, pp.13763 - 13769

ISSN
2050-7488
DOI
10.1039/d0ta02870c
URI
http://hdl.handle.net/10203/275731
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0