Treating Copper(II) Oxide Nanoflowers with Hydrogen Peroxide: A Novel and Facile Strategy To Prepare High‐Performance Copper(II) Oxide Nanosheets with Exposed (1 1 0) Facets

CuO nanosheets with exposed active (1 1 0) facets were facilely prepared through surface structure engineering by reassembling CuO nanoflowers in H2O2 aqueous solution. The CO oxidation activity on these CuO nanosheets was markedly higher than that on the pristine nanoflowers, for which the 100 % CO conversion temperature on the former was 40 °C lower than that on the latter and equal to that on a commercial catalyst (1 %Pd/γ-Al2O3). This work provides a new strategy to design and prepare high-performance nanostructured CuO catalysts.