Wet-chemical synthesis and characterization of nitrogen-doped CeO2 powders for oxygen storage capacity

Abstract

The nitrogen-doped CeO2 powders were synthesized through a mild wet-chemical method followed by calcination in air. The results of lattice parameter calculations and XPS analyses suggested that nitrogen was incorporated into the CeO2 lattice, the lattice expansion occurred, accompanied by the presence of Ce3+. Moreover, FTIR analysis revealed a possible bonding nature of nitrogen as CeN bond in the cubic CeO2 lattice. The nitrogen-doped CeO2 powders showed enhanced oxygen storage capacities with H2 serving as probe gas, and the nitrogen-doped CeO2 sample synthesized with starting N: Ce (mol) = 1.5 showed the maximum H2 consumption (1.49 mmol/g). Moreover, the dominant role of nitrogen-induced defects in CeO2 was clear for the enhanced oxygen storage capacities.