Crystal structure and compositional effects on the electrical and electrochemical properties of GdBaCo2-xMnxO5+delta (0 <= x <= 2) oxides for use as air electrodes in solid oxide fuel cells
authors Munoz-Gil, D; Urones-Garrote, E; Perez-Coll, D; Amador, U; Garcia-Martin, S
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY A
keywords DOUBLE-PEROVSKITE; TRANSPORT-PROPERTIES; LAYERED PEROVSKITES; THERMAL-EXPANSION; PHASE-TRANSITION; CATHODE MATERIAL; SOFC; GDBACO2O5+X; MN; FE
abstract The effects of the substitution of Co with Mn in the crystal structure, oxygen content, thermal stability and expansion and electrical properties of GdBaCo2-xMnxO5+delta (0 <= x <= 2) oxides are reported. Composites of GdBaCo2-xMnxO5+delta-Ce0.9Gd0.1O2-delta (70 : 30 wt%) are used as cathode materials and their electrochemical behaviour is presented. Layered-type ordering of Ba and Gd cations in the perovskite structure occurs in the whole system when the materials are prepared in argon but only for compositions in the range corresponding to x < 1.4 when the materials are prepared in air. The oxygen content increases with increasing the Mn content, causing thermal stability to improve and thermal expansion to decrease. However, lowering of the dc conductivity and an increase of electrode polarization resistances are observed by Mn substitution for Co. Cation ordering of the Gd and Ba atoms seems to affect the electrochemical properties of the materials.
publisher ROYAL SOC CHEMISTRY
issn 2050-7488
year published 2018
volume 6
issue 13
beginning page 5452
ending page 5460
digital object identifier (doi) 10.1039/c7ta10923g
web of science category Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000428670000023
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journal impact factor (jcr 2016): 8.867
5 year journal impact factor (jcr 2016): 8.824
category normalized journal impact factor percentile (jcr 2016): 93.156
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