Facet-Dependent Mn Doping on Shaped Co₃O₄ Crystals for Catalytic Oxidation

Abstract

Doping\nother metals is known as a facile strategy to improve the\ncatalytic activity of metal oxide catalysts. However, the doping behavior\nheavily depends on the surface structure of the host metal oxide,\npossibly leading to different catalytic properties. Here, Mn was doped\nonto Co₃O₄ cubes or octahedra with different\nfacets of (100) and (111), respectively. Mn could be successfully\ndoped into (100) facets, whereas it was excessively accumulated on\n(111) facets, not incorporating into the lattice. For the simultaneous\noxidation of CO, C₃H₆, and C₃H₈ with water vapor, Mn-doped Co₃O₄ cubes\nshowed superior activity because the Mn doping could improve the amount\nof surface-adsorbed oxygen and the transfer of surface oxygen species.\nThe elaborated Mn doping on Co₃O₄ cubes could\nminimize the metal oxide sintering, inducing superior durability.\nThis non-precious-metal oxide catalyst can provide an efficient solution\nfor low-cost automobile exhaust treatment.