Cu-Cu2O-TiO2 nanojunction systems with an unusual electron-hole transportation pathway and enhanced photocatalytic properties.
Cu-Cu2O-TiO2 nanojunction systems with an unusual electron-hole transportation pathway and enhanced photocatalytic properties.
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DOI：
10.1002/asia.201300019
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
Jun Xing;Z. Chen;F. Xiao;Xue Ma;C. Z. Wen;Zhen Li;H. Yang
中科院分区：
文献类型：
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作者：
Jun Xing;Z. Chen;F. Xiao;Xue Ma;C. Z. Wen;Zhen Li;H. Yang
采用温和化学方法成功合成了多组分cu - cu20 - tio2纳米结体系，并利用x射线衍射、透射电镜、场发射扫描电镜和x射线光电子能谱对其结构和组成进行了分析。制备的cu - cu20 - tio2（3和9 h）纳米结在UV/Vis光照射下降解有机化合物的过程中表现出比Cu-Cu2O、Cu-TiO2和cu20 - tio2起始材料更高的光催化活性。时间分辨光致发光光谱表明，cu - cu20 - tio2中电子和空穴的猝灭时间（3 h）高于cu - cu20 - tio2 (9 h)；这使得cu - cu20 - tio2具有较好的光催化性能（3 h）。cu - cu20 - tio2 （3 h）的光降解活性和电子空穴分离的提高可归因于组分的合理耦合和尺寸控制。同时，还发现了cu - cu20 - tio2纳米结光催化反应的一种不同寻常的电子-空穴传输途径。
Multicomponent Cu-Cu2O-TiO2 nanojunction systems were successfully synthesized by a mild chemical process, and their structure and composition were thoroughly analyzed by X-ray diffraction, transmission electron microscopy, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The as-prepared Cu-Cu2O-TiO2 (3 and 9 h) nanojunctions demonstrated higher photocatalytic activities under UV/Vis light irradiation in the process of the degradation of organic compounds than those of the Cu-Cu2O, Cu-TiO2, and Cu2O-TiO2 starting materials. Moreover, time-resolved photoluminescence spectra demonstrated that the quenching times of electrons and holes in Cu-Cu2O-TiO2 (3 h) is higher than that of Cu-Cu2O-TiO2 (9 h); this leads to a better photocatalytic performance of Cu-Cu2O-TiO2 (3 h). The improvement in photodegradation activity and electron-hole separation of Cu-Cu2O-TiO2 (3 h) can be ascribed to the rational coupling of components and dimensional control. Meanwhile, an unusual electron-hole transmission pathway for photocatalytic reactions over Cu-Cu2O-TiO2 nanojunctions was also identified.