Abstract
Raman and IR investigations indicated the presence of reduced graphene oxide (rGO)-like residues on ceria nanoparticles after solvothermal treatment in ethanol. The appearance of such structures is closely related to cerium tert-butoxide as precursor and ethanol as solvothermal solvent. The rGO-like residues improve the catalytic CO oxidation activity. This was also confirmed by introduction of “external” graphene oxide during sol–gel processing, by which the rGO structures and the catalytic activity were enhanced.
Highlights
Ceria (CeO2) has been widely studied as catalyst or catalyst support for redox reactions owing to its high oxygen storage and release capacity
The reduced graphene oxide (rGO)-like residues improve the catalytic CO oxidation activity. This was confirmed by introduction of “external” graphene oxide during sol–gel processing, by which the rGO structures and the catalytic activity were enhanced
We did not check cerium alkoxides, Ce(OR)4, with other groups R. This indicates that the appearance of residues with rGO-like structures is closely related to cerium tert-butoxide (or possibly Ce(OR)4 in general) as precursor and ethanol as the solvothermal solvent
Summary
Ceria (CeO2) has been widely studied as catalyst or catalyst support for redox reactions owing to its high oxygen storage and release capacity. Raman and IR investigations indicated the presence of reduced graphene oxide (rGO)-like residues on ceria nanoparticles after solvothermal treatment in ethanol. The procedure for the preparation of the ceria–rGO composites was the same as previously reported for that of pure ceria [17] (or Co3O4-modified CeO2 [19]) with the difference that varying proportions of GO were added to the precursor mixture.
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