Solid-state in situ constructing Cu2O/CuO heterostructures with adjustable phase compositions toward promoted CO oxidation activity
Heterostructural Cu-based oxides have been widely used in many fields, such as energy storage, catalysis, and sensors. Conventional techniques for the synthesis of hybrid oxides often result in low yield and time-consuming. The scalable preparation of heterostructural Cu-based oxides with adjustable phase compositions remains a substantial challenge. We demonstrate a simple and efficient solid-state synthesis strategy for in situ preparing Cu2O/CuO heterostructural nanorods with size about 10 nm in width without the assistant of solvents and post calcining processing. Tuning the ratio of reactants enable to optimize the component of Cu2O/CuO heterostructures and their catalytic activities toward carbon monoxide (CO) oxidation reaction. Benefiting from the controllable compositions, synergistic effect, and the surface adsorbed oxygen, resulting Cu2O/CuO heterostructures (Cu2O/CuO-5) show significantly improved catalytic performance in CO oxidation reaction process. It is believed that this method could provide a new and simple way to synthesize various metal oxide heterostructures for wide applications.