Photocatalytic Hydrogen Production with Tunable Nanorod Heterostructures
Photocatalytic Hydrogen Production with Tunable Nanorod Heterostructures
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DOI：
10.1021/jz100075c
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发表时间：
2010-04-01
影响因子：
5.7
通讯作者：
Alivisatos, A. Paul
中科院分区：
文献类型：
--
作者：
Amirav, Lilac;Alivisatos, A. Paul
我们报道了一种旨在光催化生产氢的多组分纳米异质结构的设计。该系统由铂端硫化镉棒和嵌入硒化镉种子组成。在这种结构中，孔被三维地限制在。硒化镉，而离域电子被转移到金属尖端。因此，电子现在通过三种不同的组分和可调的物理长度与空穴分离。本文研究的种子棒金属尖端样品促进了高效、持久的载流子分离，并最大限度地减少了中间体的反反应。通过调整纳米棒异质结构长度和种子大小，我们能够显著提高与未播种的纳米棒相比的产氢活性。该结构在450nm处的表观量子产率为20%，在橙光照射下具有活性，并且与没有CdSe种子的CdS棒相比，具有更高的稳定性。
We report the design of a multicomponent nanoheterostructure aimed at photocatalytic production of hydrogen. The system is composed of a platinum-tipped cadmium sulfide rod with an embedded cadmium selenide seed. In such structures, holes are three-dimensionally confined to. the cadmium selenide, whereas the delocalized electrons are transferred to the metal tip. Consequently, the electrons are now separated from the holes over three different components and by a tunable physical length. The seeded rod metal tip samples studied here facilitate efficient long-lasting charge carrier separation and minimize back reaction of intermediates. By tuning the nanorod heterostructure length and the seed size, we were able to significantly increase the activity for hydrogen production compared to that of unseeded rods. This structure was found to be highly active for hydrogen production, with an apparent quantum yield of 20% at 450 nm, and was active under orange light illumination and demonstrated improved stability compared to CdS rods without a CdSe seed.