Publication details

Authors: Kolotygin, V. A.; Tsipis, E. V.; L, M. F.; Pivak, Y. V.; Yarmolenko, S. N.; Bredikhin, S. I.; Kharton, V. V. 
Title: Functional properties of SOFC anode materials based on LaCrO3, La(Ti,Mn)O3 and Sr(Nb,Mn)O3 perovskites: A comparative analysis 
Type: Journal Article 
Publisher: Solid State Ionics 
Year: 2013 
Volume: 251 
Start Page: 28 
End Page: 33 
DOI: 10.1016/j.ssi.2013.01.005 
Abstract: The electrochemical, transport and thermomechanical properties of perovskite-type (La1  xSrx)1  yMn0.5Ti0.5O3  (x = 0.150.75; y = 00.05), (La0.75  xSr0.25 + x)0.95Mn0.5Cr0.5  xTixO3  (x = 00.5), (La0.75Sr0.25)0.95Cr1  xFexO3  (x = 0.30.4), SrNb1  xMnxO3  (x = 0.50.8) and (La0.9Sr0.1)0.95Cr0.85Mg0.1Ni0.05O3  have been appraised in light of their applicability for solid oxide fuel cell (SOFC) anodes. The electrical conductivity, measured in the oxygen partial pressure range of 10 20 to 0.5 atm at 9401270 K, increases with manganese and strontium additions which lead, however, to higher reducibility. In addition to the thermodynamic stability limitations under the SOFC anodic conditions, the latter factor raises the importance of chemically induced expansion, as for Fe-substituted (La,Sr)CrO3  . The reduction of Ni-doped chromite results in the formation of nanosized metallic particles dispersed on the perovskite surface, and has no significant effect on the transport properties governed by the perovskite phase. The maximum electrochemical performance was observed for porous La0.5Sr0.5Mn0.5Ti0.5O3  , (La0.9Sr0.1)0.95Cr0.85Mg0.1Ni0.05O3  and (La0.75Sr0.25)0.95Cr0.7Fe0.3O3  electrodes in the electrochemical cells with lanthanum gallate-based solid electrolyte and Ce0.8Gd0.2O2  interlayers. 
Keywords: Oxide anode, Intermediate-temperature SOFCs, Electrode polarization, Electronic conductivity, Chemical expansion, Controlled-atmosphere dilatometry 
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