Fabrication of CdS-Coated ZnO Nanorods Arrays for Photoelectrocatalytic Degradation of Phenol
Fabrication of CdS-Coated ZnO Nanorods Arrays for Photoelectrocatalytic Degradation of Phenol
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CdS 涂层 ZnO 纳米棒阵列的制备用于光电催化降解苯酚
DOI：
10.1166/jnn.2016.11662
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发表时间：
2016-08
影响因子：
--
通讯作者：
Jiang, Zhaohua
中科院分区：
文献类型：
--
作者：
Guo, Chongshen;Liu, Shaoqin;Yang, Bin;Jiang, Zhaohua
采用连续离子层吸附反应（SILAR）技术在ZnO纳米棒阵列上成功沉积了CdS壳层，通过改变沉积周期可以精确调节CdS壳层的厚度。紫外-可见光谱表明，随着沉积周期的增加，CdS壳层厚度呈线性增加，实现最佳光电响应的最佳沉积周期为20层。光致发光的结果表明，CdS壳层和ZnO核层之间存在良好的能带排列，这使得CdS包覆的ZnO纳米棒在可见光照射下表现出良好的光电化学性能和较高的催化活性。在可见光照射下，100 mg/L苯酚溶液在150 min内的光电催化降解率达到80%左右，远高于光催化降解率17.6%和电化学降解率19.4%。
CdS shells have been successfully deposited on ZnO nanorod arrays via using successive ionic layer adsorption and reaction (SILAR) technique upon which the thickness of the CdS shell can be accurately tuned by changing the deposition cycles. As determined by UV-Vis spectra, increasing the deposition cycles leads to a linear increment on shell thickness of CdS, and the optimal deposition cycle for realizing the best photoelectrical response is 20 layers. Photoluminescent results reveal a proper band alignment between the CdS shell and the ZnO core, benefitting from which CdS-coated ZnO nanorods exhibit good photoelectrochemical properties and high catalytic activity for removal of phenol under visible light irradiation. In the photoelectrocatalytic process, about 80% degradation of 100 mg/L phenol solution is achieved within 150 min under visible light irradiation, which is much higher than that in the photocatalytic process of 17.6% or electrochemical process of 19.4%.