Coaxial nanocable consisted of p-type Cu2O nanowires and n-type TiO2 nanotubes arrays was prepared in the porous anodic aluminum oxide（AAO） template via the sol-gel method and subsequent electrodeposition method. X-...Coaxial nanocable consisted of p-type Cu2O nanowires and n-type TiO2 nanotubes arrays was prepared in the porous anodic aluminum oxide（AAO） template via the sol-gel method and subsequent electrodeposition method. X-ray diffraction analysis identified an anatase structure of the TiO2 nanotubes and cubic structure of the Cu2O nanowires. The obtained samples were also characterized by scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and energy dispersive X-ray spectroscopy（EDS）. The diffrence of open circuit potential of the coaxial nanocable electrode was larger than that of the TiO2 nanotubes electrode under ultraviolet illumination, which means doping with Cu2O could improve the photovoltage effectively. Meanwhile, nanocable arrays exhibited a high activity for photodegrading Rhodamine B under Xe lamp irradiation and the photocatalysis degradation efficiency was up to 98.69% after degradation for 7 h. The enhanced photocatalytic activity could be attributed to the high migration efficiency of photoinduced electrons, which may suppress the charge recombination effectively.展开更多
以多壁碳纳米管(MWCNT)为模板,通过正硅酸乙酯(TEOS)的水解缩聚反应制得MWCNT@SiO2纳米同轴电缆.采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)和电化学测试对样品的形貌、结构及电化学性能进行表征.结果表明,MWCNT表面包覆了一层厚度...以多壁碳纳米管(MWCNT)为模板,通过正硅酸乙酯(TEOS)的水解缩聚反应制得MWCNT@SiO2纳米同轴电缆.采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)和电化学测试对样品的形貌、结构及电化学性能进行表征.结果表明,MWCNT表面包覆了一层厚度均匀的多孔SiO2层,利于其获得较好的储锂性能.作为锂离子电池负极材料,MWCNT@SiO2纳米同轴电缆表现出了较高的比容量和较好的循环性能.在100 m A/g电流密度下经过80次循环,MWCNT@SiO2纳米同轴电缆的放电比容量仍高达431.7 m A·h/g,高于石墨材料的理论比容量(372 m A·h/g).展开更多
基金Supported by the Natural Science Foundation of Tianjin, China（No. 11JCYBJC01900）.
文摘Coaxial nanocable consisted of p-type Cu2O nanowires and n-type TiO2 nanotubes arrays was prepared in the porous anodic aluminum oxide（AAO） template via the sol-gel method and subsequent electrodeposition method. X-ray diffraction analysis identified an anatase structure of the TiO2 nanotubes and cubic structure of the Cu2O nanowires. The obtained samples were also characterized by scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and energy dispersive X-ray spectroscopy（EDS）. The diffrence of open circuit potential of the coaxial nanocable electrode was larger than that of the TiO2 nanotubes electrode under ultraviolet illumination, which means doping with Cu2O could improve the photovoltage effectively. Meanwhile, nanocable arrays exhibited a high activity for photodegrading Rhodamine B under Xe lamp irradiation and the photocatalysis degradation efficiency was up to 98.69% after degradation for 7 h. The enhanced photocatalytic activity could be attributed to the high migration efficiency of photoinduced electrons, which may suppress the charge recombination effectively.
基金Supported by the National Natural Science Foundation of China(50772110,50721091)Fundamental Research Funds for the Central Universities(WK2030000004)
文摘以多壁碳纳米管(MWCNT)为模板,通过正硅酸乙酯(TEOS)的水解缩聚反应制得MWCNT@SiO2纳米同轴电缆.采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)和电化学测试对样品的形貌、结构及电化学性能进行表征.结果表明,MWCNT表面包覆了一层厚度均匀的多孔SiO2层,利于其获得较好的储锂性能.作为锂离子电池负极材料,MWCNT@SiO2纳米同轴电缆表现出了较高的比容量和较好的循环性能.在100 m A/g电流密度下经过80次循环,MWCNT@SiO2纳米同轴电缆的放电比容量仍高达431.7 m A·h/g,高于石墨材料的理论比容量(372 m A·h/g).
