Synthesis and photocatalytic application of oriented hierarchical ZnO flower-rod architectures
Synthesis and photocatalytic application of oriented hierarchical ZnO flower-rod architectures
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定向分级ZnO花棒结构的合成及光催化应用
DOI：
10.1016/j.jhazmat.2012.02.074
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发表时间：
2012-05-30
影响因子：
13.6
通讯作者：
Chen, Jianzhong
中科院分区：
文献类型：
--
作者：
Han, Zhizhong;Liao, Lan;Chen, Jianzhong
使用基于溶液的方法辅助 ZnO 种子层，在掺铟锡氧化物 (ITO) 玻璃上制备定向分层 ZnO 花棒阵列 (FR)。所制备的 ZnO FRs/ITO 被用作一种方便的光催化装置，无需离心即可回收。结果表明，ZnO FRs为纤锌矿相，单晶沿[001]方向生长。光致发光（PL）光谱表明，与ZnO纳米颗粒（NP）相比，ZnO FRs表面存在更多的氧空位。还采用罗丹明B（RhB）作为电解质的电化学方法研究了RhB作为光催化底物的光降解机理。对于ZnO FRs，在紫外线照射和电流密度下较高的光生电流证明电子-空穴对的复合受到氧空位的限制，而较低的电荷转移电阻表明电荷可以通过ZnO取向结构快速移动。因此，与ZnO NPs相比，ZnO FRs的光催化活性增强，并且在UV照射1.5 h后，ZnO FRs光催化剂的RhB降解效率接近100%。 (C) 2012 Elsevier B.V. 保留所有权利。
An oriented hierarchical ZnO flower-rod arrays (FRs) were prepared on indium doped tin oxide (ITO) glass using a facile solution-based method assisted with ZnO seed layer. And the as-prepared ZnO FRs/ITO was used as a convenient photocatalytic device that recycled without centrifugation. The results show that ZnO FRs are wurtzite phase with single crystalline grown along the [001] direction. The photoluminescence (PL) spectra illustrate that there are more oxygen vacancies on the surface of ZnO FRs compared with ZnO nanoparticles (NPs). The electrochemical methods using Rhodamine B (RhB) as electrolyte are also performed to study on the photodegradation mechanism where RhB is acted as photocatalytic substrate. For ZnO FRs, the higher photoinduced currents under UV irradiation and current density prove that the recombination of electron-hole pairs is restrained with oxygen vacancies, and the lower charge transfer resistance suggest that the charges could move quickly through ZnO oriented structures. Therefore, the photocatalytic activity is enhanced by ZnO FRs compared with ZnO NPs, and RhB degradation efficiency of ZnO FRs photocatalysts is nearly 100% by UV irradiation for 1.5 h. (C) 2012 Elsevier B.V. All rights reserved.