Proton conduction at the surface of Y-doped BaCeO3

Citation
T. Hibino et al., Proton conduction at the surface of Y-doped BaCeO3, J PHYS CH B, 105(46), 2001, pp. 11399-11401
Citations number
22
Language
INGLESE
art.tipo
Letter
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
1520-6106 → ACNP
Volume
105
Issue
46
Year of publication
2001
Pages
11399 - 11401
Database
ISI
SICI code
1520-6106(20011122)105:46<11399:PCATSO>2.0.ZU;2-3
Abstract
In our work, 25 mol % of Y3+-doped BaCeO3 (BCY25) showed an extremely low a ctivation energy of 0.3 eV for proton conduction at the surface. The result ing overall conductivity at the surface reached 8.24 x 10(-3) S cm(-1) at 4 00 degreesC, which was 3, 8, and 28 times higher than conductivities in the bulk of BCY25, 20 mol % Sm3+-doped ceria, and 8 mol % yttriia-stabilized z irconia, respectively. A large H/D isotope effect strongly suggested that t he enhanced proton conductivities were due to an advantageous jump of proto ns between adjacent oxide ions at the surface. Such fast proton conduction enabled an air/fuel sensor using BCY25 as the solid electrolyte to work at 200 degreesC or less.