A high performance cobalt-doped ZnO visible light photocatalyst and its photogenerated charge transfer properties
A high performance cobalt-doped ZnO visible light photocatalyst and its photogenerated charge transfer properties
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DOI：
10.1007/s12274-011-0163-4
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发表时间：
2011-11-01
期刊：
影响因子：
9.9
通讯作者：
Jiang, Tengfei
中科院分区：
文献类型：
--
作者：
Lu, Yongchun;Lin, Yanhong;Jiang, Tengfei
采用水热法制备了高光催化活性的掺钴氧化锌(ZnO：Co)纳米棒。X射线衍射、X射线光电子能谱、拉曼散射和紫外-可见漫反射光谱证实了掺杂离子替代了部分晶格锌离子，并且Co(2+)和Co(3+)共存。与纯的氧化锌相比，制备的氧化锌：钴具有更宽的光吸收范围和高效的光催化活性，在可见光照射下仅需60min即可降解93%的茜素红染料(波长420 nm)。利用表面光电压谱研究了可见光光催化活性的光物理机理。结果表明，钴与氧化锌之间存在较强的电子相互作用，钴的加入促进了电荷的分离，提高了电荷转移能力，同时有效地抑制了光生载流子的复合，使其具有较高的可见光催化活性。
Highly photocatalytically active cobalt-doped ZnO (ZnO:Co) nanorods have been prepared by a facile hydrothermal process. X-ray diffraction, X-ray photoelectron spectroscopy, Raman scattering and UV-vis diffuse reflectance spectroscopy confirmed that the dopant ions substitute for some of the lattice zinc ions, and furthermore, that Co(2+) and Co(3+) ions coexist. The as-prepared ZnO:Co samples have an extended light absorption range compared with pure ZnO and showed highly efficient photocatalytic activity, only requiring 60 min to decompose similar to 93% of alizarin red dye under visible light irradiation (lambda > 420 nm). The photophysical mechanism of the visible photocatalytic activity was investigated with the help of surface photovoltage spectroscopy. The results indicated that a strong electronic interaction between the Co and ZnO was present, and that the incorporation of Co promoted the charge separation and enhanced the charge transfer ability and, at the same time, effectively inhibited the recombination of photogenerated charge carriers in ZnO, resulting in high visible light photocatalytic activity.