Vertically aligned ZnO-Au@CdS core-shell nanorod arrays as an all-solid-state vectorial Z-scheme system for photocatalytic application
Vertically aligned ZnO-Au@CdS core-shell nanorod arrays as an all-solid-state vectorial Z-scheme system for photocatalytic application
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垂直排列的 ZnO-Au@CdS 核壳纳米棒阵列作为光催化应用的全固态矢量 Z 型系统
DOI：
10.1039/c6ta07845a
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发表时间：
2016
影响因子：
11.9
通讯作者：
Yi-Jun Xu
中科院分区：
文献类型：
--
作者：
Nan Zhang;Shun-Ji Xie;Bo Weng;Yi-Jun Xu
开发高性能的人工光合作用系统是利用太阳能缓解环境和能源危机的关键。将不同的功能材料巧妙地集成到定向纳米结构中，对于构建具有额外结构导向优点的更有效的光催化系统具有很大的希望。在这里，我们报告了一个全固态矢量Z-计划光合系统组成的垂直排列的ZnO-Au@CdS核壳纳米棒阵列通过异质外延生长过程中制备的。结果表明，ZnO-Au@CdS三元复合纳米结构体系的光催化效率约为100%。在模拟太阳光照射下，ZnO和ZnO-Au体系对芳香硝基化合物的选择性还原效率分别是ZnO和ZnO-Au体系的79倍和28倍，由于有效的矢量Z-电子转移过程，其选择性还原效率甚至是ZnO@CdS体系的1.5倍。此外，具有膜结构的ZnO-Au@CdS纳米棒阵列在本反应条件下易于回收且高度稳定。这项工作展示了一个范例，用于构建一个全固态Z-计划的人工光合系统，有利于增强光收集，有效的电荷分离和转移，易于回收和良好的光稳定性对太阳能转换。
The development of high-performance artificial photosynthesis systems is central to taking advantage of solar energy to alleviate the environmental and energy crises. Integrating different functional materials ingeniously into an oriented nanoarchitecture holds great promise for constructing more efficient photocatalytic systems with additional structure-directing merits. Here we report an all-solid-state vectorial Z-scheme photosynthetic system composed of vertically aligned ZnO–Au@CdS core–shell nanorod arrays prepared via a heteroepitaxial growth process. Resulting from the synergistic effects of the three functional components integrated in this nanoarray structured system, the photocatalytic efficiency of the optimal ternary ZnO–Au@CdS hybrid is ca. 79 and 28 times higher than that of ZnO and ZnO–Au counterparts, respectively, toward selective reduction of aromatic nitro compounds in water under simulated sunlight irradiation, and even 1.5 times as high as that of the direct Z-scheme featured ZnO@CdS system due to the effective vectorial Z-scheme electron transfer process. Furthermore, the ZnO–Au@CdS nanorod arrays with a film structure are readily recycled and highly stable under the present reaction conditions. This work demonstrates a paradigm for constructing an all-solid-state Z-scheme artificial photosynthetic system favoring enhanced light harvesting, efficient charge separation and transfer, easy recycling and good photostability toward solar energy conversion.