| Authors: | Kolotygin, V. A.; Tsipis, E. V.; Lý, 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 |
| Issue: | |
| Start Page: | 28 |
| End Page: | 33 |
| DOI: | 10.1016/j.ssi.2013.01.005 |
| WEB-link: | http://www.sciencedirect.com/science/article/pii/S0167273813000325 |
| Abstract: | The electrochemical, transport and thermomechanical properties of perovskite-type (La1 xSrx)1 yMn0.5Ti0.5O3 ý (x = 0.150.75; y = 00.05), (La0.75 xSr0.25 + x)0.95Mn0.5Cr0.5 xTixO3 ý (x = 00.5), (La0.75Sr0.25)0.95Cr1 xFexO3 ý (x = 0.30.4), SrNb1 xMnxO3 ý (x = 0.50.8) and (La0.9Sr0.1)0.95Cr0.85Mg0.1Ni0.05O3 ý 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 ý. 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 ý, (La0.9Sr0.1)0.95Cr0.85Mg0.1Ni0.05O3 ý and (La0.75Sr0.25)0.95Cr0.7Fe0.3O3 ý electrodes in the electrochemical cells with lanthanum gallate-based solid electrolyte and Ce0.8Gd0.2O2 ý interlayers. |
| Keywords: | Oxide anode, Intermediate-temperature SOFCs, Electrode polarization, Electronic conductivity, Chemical expansion, Controlled-atmosphere dilatometry |
| File: | (877K) |
