Sintering and Oxygen Transport in Ce0.8Pr0.2O2-delta: A Comparative Study of Mn and Co Oxide Additives
authors Fagg, DP; Garcia-Martin, S; Pascual, MJ; Kharton, VV; Frade, JR
nationality International
journal JOURNAL OF THE ELECTROCHEMICAL SOCIETY
keywords CERIA SOLID-SOLUTIONS; THERMAL-EXPANSION; DOPED CERIA; ELECTRICAL-CONDUCTIVITY; MIXED CONDUCTORS; ELECTRONIC TRANSPORT; FUEL-CELLS; CEO2; PERMEABILITY; AIDS
abstract Minor additions of manganese oxide and cobalt oxide are both shown to be good sintering, aids for a Ce0.8Pr0.2O2-delta promising ceramic membrane material with comparable values Of partial oxygen-ionic and electronic conductivities, to offer dense ceramics with submicron grain under 1150 degrees C. Transmission electron microscopy and X-ray energy dispersive spectroscopy suggest the transition-metal oxide addition to be located in the grain boundary regions. The smallest grain size is observed in the case of materials with Mn additions. Whereas the addition of cobalt oxide radically improves the transport properties boosting, the level of electronic conductivity by two to three times and leaving the ionic conductivity intact, the addition of manganese oxide is Shown to he detrimental, increasing the activation energy for ionic Conductivity while offering no benefit to electronic conductivity. These characteristic transport properties impact oil levels of oxygen permeation. The flux is significantly improved ill the case of Co additions due to an increased ambipolar conductivity and improved oxygen surface kinetics, whereas no improvement ill oxygen permeation flux is observed for Mn additions in comparison to the base composition It has been suggested that a very slight increase ill solubility Of the transition oxide addition in the grain bulk in the Mn-doped case may offer all explanation of the resultant properties. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3068396] All rights reserved.
publisher ELECTROCHEMICAL SOC INC
issn 0013-4651
year published 2009
volume 156
issue 3
beginning page F47
ending page F53
digital object identifier (doi) 10.1149/1.3068396
web of science category Electrochemistry; Materials Science, Coatings & Films
subject category Electrochemistry; Materials Science
unique article identifier WOS:000265837900050
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.662
5 year journal impact factor 3.520
category normalized journal impact factor percentile 79.088
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg