The effect of the oxidation states of supported oxides on catalytic activity: CO oxidation studies on Pt/cobalt oxide

Abstract

The strong metal–oxide interaction of platinum nanoparticles (PtNPs) deposited on two types of cobalt oxides, CoO and Co₃O₄, was investigated using CO oxidation. Two different sizes of PtNPs as well as arc-plasma-deposited (APD) PtNPs without a capping layer were used to reveal the effect of metal–oxide interfaces on catalytic activity. An enhanced catalytic activity was observed on the PtNPs on the Co₃O₄ substrate, which was ascribed to the reducible support and to the interfacial sites.