Rapid preparation and photocatalytic properties of octahedral Cu2O@Cu powders |
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Authors: | Jiayuan Chang Qiwen Bao Cong Zhang Xinhao Zhao Zongsheng Cao Yuan Wang Ruirui Li Ruyue Guo Huayi Li Jie He Peng Pan Zhengchun Yang Jun Wei |
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Affiliation: | 1. School of Electrical and Electronic Engineering, Advanced Materials and Printed Electronics Center, Tianjin Key Laboratory of Film Electronic & Communication Devices, Tianjin University of Technology, Tianjin 300384, China;2. School of Precision Instrument and Optoelectronic Engineering, the State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin University, Tianjin 300072, China;3. School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China |
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Abstract: | To improve the photocatalytic properties of Cu2O, octahedral Cu2O@Cu powders were prepared by a convenient and rapid two-step liquid phase reduction method. Glucose (C6H12O6) and thiourea dioxide (CH4N2O2S, TD for short) were used as pre-reductant and secondary-reductant separately. The microstructure and composition of the products obtained after the reduction processes were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). With the increasing of TD content, the secondary reduced products changed from solid octahedral Cu2O to octahedral Cu2O@Cu composites and finally hollow octahedral Cu2O/Cu composites. The corresponding calculated mass of Cu increased from 6.2 wt% to 80.2 wt%. The photocatalytic behavior of the reduced particles were analyzed by monitoring the degradation of methyl orange solution (MO for short) and electrochemical tests. Photocatalytic performance tests showed that octahedral Cu2O@Cu powders had an excellent photocatalytic activity. The MO degradation rate was improved from 1.4% for photocatalysts without CuNPs to 92.9% after introducing 13.4 wt% CuNPs under visible light irradiation for 60 min. This simple and rapid synthesis process allowed for the fabrication of octahedral Cu2O@Cu material with photocatalytic performance superior to pure octahedral Cu2O and hollow octahedral Cu2O/Cu materials. |
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Keywords: | Liquid phase reduction Hollow octahedron Photocatalysis |
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