A. Kahoul et al., Solvent effect on synthesis of perovskite-type La1-xCaxCoO3 and their electrochemical properties for oxygen reactions, MATER RES B, 35(12), 2000, pp. 1955-1966
The object of the present investigation is to compare some physico-chemical
properties of two La1-xCaxCoO3 series (0.0 less than or equal to x less th
an or equal to 0.6), prepared by the sol-gel route using either water or pr
opanol as solvents. The synthesized oxide powders were characterized by X-r
ay diffraction (XRD), energy-dispersive spectroscopy (EDS), BET, and electr
ical conductivity measurements. The morphology of the powders was examined
using scanning electron microscopy (SEM). The results revealed that the use
of propanol led systematically to the formation of homogeneous oxides with
a single perovskite-structure phase, larger surface area, and higher condu
ctivity values compared with those prepared using water. Such features, whi
ch seem to be directly related to the properties of the solvent of the star
ting solution, are undoubtedly favorable for a higher electrocatalytic acti
vity of these oxides in oxygen electrode reactions. (C) 2001 Elsevier Scien
ce Ltd. All rights reserved.