Abstract
Cu2O nanomaterials have a suitable band gap and high carrier mobility, but its stability and quantum yield are low. Through the research of scientists, it is found that the metal elements can help to improve the performance of Cu2O nanomaterials. In the paper, the Cu2O@Ag core-shell nanocomposite was quickly synthesized by hydrothermal method, and its method didn't need to use toxic solvents and additives. Trough XRD analysis, the obtained samples were composed of Cu2O and Ag without other impurities. The valence band of Cu atom was Cu + rather than Cu2+ and Cu0 by XPS. The morphologies of pure Cu2O and Cu2O@Ag composites were all quasi spherical. Meantime, it was found that the size of Cu2O@Ag was decreased with the increase of silver content. The reaction mechanism was also explained. Finally, the visible-light absorption and electrochemical impedance performance were investigated, which indicated the addition of Ag can increase the absorption range of visible light and reduce the impedance.
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