Elucidating the active phases of CoO_x films on Au(111) in the CO oxidation reaction.

ABSTRACT: Noble metals supported on reducible oxides, like CoO_x and TiO_x, exhibit superior activity in many chemical reactions, but the origin of the increased activity is not well understood. To answer this question we studied thin films of CoO_x supported on an Au(111) single crystal surface as a model for the CO oxidation reaction. We show that three reaction regimes exist in response to chemical and topographic restructuring of the CoO_x catalyst as a function of reactant gas phase CO/O₂ stoichiometry and temperature. Under oxygen-lean conditions and moderate temperatures (≤150 °C), partially oxidized films (CoO_x<1) containing Co⁰ were found to be efficient catalysts. In contrast, stoichiometric CoO films containing only

SUBMITTER: Chen H 

PROVIDER: S-EPMC10613203 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature