Formation and properties of reaction layers of cobaltite electrodes on bismuth oxide electrolytes

Abstract

Interaction o f electrodes consisting o f perovskite-like rare earth elem ents (R EE) and strontium cobaltites with Bio.7 5 Yo.25Oj 5 solid electrolyte has been studied. Formation o f solid solutions L a ,_ t _ vS r ,B ivC o 0 1_ A (jc = 0 -0 .5 ; y = 0 -0 .1 ) as w ell as ( B i , _ tC or) , _ vY vO , 5 (* = 0 -0 .4 ; >' = 0 -0 .2 5 ) can occur in the diffusion layer betw een cobaltite electrodes and B i20 3-based solid electrolytes. The crystal structure, electrical conductivity and oxygen perm eability o f these solid solutions have been investigated. It has been found that the values o f the conductivity and oxygen permeability o f L a(Sr,B i)C o(), л solid solutions decrease with increasing bismuth content. The results o f the investigation o f polarization resistance o f oxide electrodes in contact with B i0 7 5 Y H2 5 O , 5 solid electrolyte are presented.

Propiedades de transporte de cerámicas Bicuvox dopadas

“…Experimental procedures for the characterisation, including determination of the oxygen-ion transference numbers by the e.m.f. method, have been reported elsewhere (6,(9)(10)(11)(12)(13)(14). The spectroscopic analysis showed no deviations in the cation composition of the ceramics with respect to their chemical formulas within the experimental error limits; the total concentration of impurities was found to be less than 0.01 at%.…”

Interfacial modification of La0.80Sr0.20MnO3−δ–Er0.4Bi0.6O3 cathodes for high performance lower temperature solid oxide fuel cells

“…1b. Kharton et al reported this reactivity is due to the formation of a solid solution by interdiffusion at the cobaltite/Bi 2 O 3 -based oxide interface [41]. Fig.…”

Specific features of spin, charge, and orbital ordering in cobaltites

“…A certain shortcoming of cobalt oxide cathodes is the impossibility of using them in combination with the traditional zirconium-based electrolyte, because chemical reactions in a heated system rapidly produce La 2 Zr 2 O 7 and SrZrO 3 dielectric phases [265]. However, a combination of cobaltites and electrolytes based on bismuth and cerium oxides looks quite promising [266].…”