Abstract
Herein, we report on the synthesis of Ce0.5Zr0.5-xTixO2 oxygen storage materials prepared via a solution combustion method. Ce0.5Zr0.4Ti0.1O2 showed an outstanding oxygen storage capacity (1310 μmol-O per g) at 200 °C compared to conventional κ-Ce2Zr2O8 (650 μmol-O per g) due to its cation ordering and the formation of weakly bound oxygen atoms induced by Ti substitution.
Highlights
We report on the synthesis of Ce0.5Zr0.5ÀxTixO2 oxygen storage materials prepared via a solution combustion method
Ce0.5Zr0.4Ti0.1O2 showed an outstanding oxygen storage capacity (1310 lmol-O per g) at 200 8C compared to conventional j-Ce2Zr2O8 (650 lmol-O per g) due to its cation ordering and the formation of weakly bound oxygen atoms induced by Ti substitution
Some metal oxides can reversibly store/release oxygen or control the oxygen concentration in the gas phase in response to changes in the temperature and oxygen partial pressure.[1]. Such oxides have been actively investigated for different applications in the fields of energy conversion and environmental protection such as solid oxide fuel cells (SOFCs),[2] thermochemical water splitting,[3] and water–gas shift reactions.[4]
Summary
The combustion of fuels (e.g. urea, glycine, etc.) with oxidants (typically metal nitrates) followed by a rapid quenching allowed us to obtain homogeneous compounds with desired compositions.[19,20] the Ti substitution in Ce0.5Zr0.5ÀxTixO2 (0 r x r 0.2) induced pyrochlore-type cation ordering between the Ce and Zr sites and greatly increased the OSC values. The specific surface areas (SSAs) of the Ti-containing samples (x = 0.1 : 8.29 m2 gÀ1, x = 0.2 : 7.48 m2 gÀ1) were less than half of the amount of x = 0 (17.08 m2 gÀ1) These SSAs were much higher than that of k-Ce2Zr2O8 (0.35 m2 gÀ1), which was obtained by a high-temperature reduction of Ce0.5Zr0.5O2 at 1200 1C followed by oxidation at 500 1C (Table 1).
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