Au@TiO2-CdS Ternary Nanostructures for Efficient Visible-Light-Driven Hydrogen Generation
Au@TiO2-CdS Ternary Nanostructures for Efficient Visible-Light-Driven Hydrogen Generation
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DOI：
10.1021/am4021654
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发表时间：
2013-08-28
影响因子：
9.5
通讯作者：
Xue, Can
中科院分区：
文献类型：
--
作者：
Fang, Jun;Xu, Lin;Xue, Can
本文报道了一种新型的Au@TiO2-CdS三元纳米结构。与CdS-TiO 2和Au@TiO2等二元结构相比，这些三元纳米结构在可见光照射下表现出非常高的光催化H2-生成速率。CdS的光催化活性增强是由于其独特的三元结构设计，使CdS的光激发电子通过TiO 2的桥联作用向核心Au粒子转移，从而有效地抑制了CdS光催化剂上的电子-空穴复合。这种内部电子转移途径（CdS -> TiO 2-> Au）消除了对金属助催化剂的后沉积的需要，因为核Au纳米颗粒可以充当质子还原朝向析氢的内部活性催化剂。我们相信，我们的工作展示了一种有前途的方法，合理设计的金属半导体混合光催化剂，可以实现高的光催化效率，用于太阳能燃料的生产。
We report a new type of Au@TiO2-CdS ternary nanostructure by decorating CdS nanopartides onto Au@TiO2 core-shell structures. In comparison to that of binary structures such as CdS-TiO2 and Au@TiO2, these ternary nanostructures exhibit a remarkably high photocatalytic H-2-generation rate under visible-light irradiation. The enhanced photocatalytic activity is attributed to the unique ternary design, which builds up a transfer path for the photoexcited electrons of CdS to the core Au particles via the TiO2 nanocrystal bridge and thus effectively suppresses the electron-hole recombination on the CdS photocatalyst. This internal electron-transfer pathway (CdS -> TiO2 -> Au) eliminates the need for the postdeposition of the metal cocatalyst because the core Au nanoparticles can act as the interior active catalyst for proton reduction toward hydrogen evolution. We believe that our work demonstrates a promising way for the rational design of metal semiconductor hybrid photocatalysts that can achieve a high photocatalytic efficiency for use in solar fuels production.