Nanoparticles enwrapped with nanotubes: A unique architecture of CdS/titanate nanotubes for efficient photocatalytic hydrogen production from water
Nanoparticles enwrapped with nanotubes: A unique architecture of CdS/titanate nanotubes for efficient photocatalytic hydrogen production from water
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包裹着纳米管的纳米粒子：CdS/钛酸盐纳米管的独特结构，用于高效光催化水产氢
DOI：
10.1039/c0jm03945d
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Guo, Liejin
中科院分区：
文献类型：
--
作者：
Chen, Yubin;Wang, Lianzhou;Guo, Liejin
采用简单的一步水热法成功制备了具有独特形貌的CdS/钛酸盐纳米管（CdS/TNTs）光催化剂。与传统的两步法制备的CdS@TNTs复合光催化剂相比，CdS/TNTs在可见光照射下具有更高的光催化析氢活性。透射电子显微镜（TEM）显示，CdS纳米粒子是密切包围周围的TNT。这种独特的结构导致CdS纳米颗粒的适当分散和CdS纳米颗粒与TNT之间的紧密多点接触，这导致CdS/TNT中的电荷分离显著增强。因此，提高了光活性。同时，X射线粉末衍射（XRD）结果表明，CdS/TNTs中得到了高度结晶的六方晶系CdS，这也是提高光催化性能的必要条件。Cd/Ti摩尔比对CdS/TNTs的形貌和光催化活性有影响，最佳值为0.05。在此条件下，CdS的量仅为总光催化剂的6wt%，这从环境的角度来看是重要的。考察了Pt负载量对CdS/TNT催化剂活性的影响。2.0 wt% Pt负载的CdS/TNT的产氢速率达到353.4 μmol h-1，在420 nm处的表观量子产率为25.5%。该研究为合成具有新型结构的高效复合光催化剂提供了一条潜在的途径。
CdS/titanate nanotubes (CdS/TNTs) photocatalysts with a unique morphology were successfully synthesized via a simple one-step hydrothermal method. Compared with traditional CdS@TNTs composite photocatalysts prepared by the common two-step method, CdS/TNTs exhibited much higher activity for photocatalytic hydrogen evolution under visible light irradiation. Transmission electron microscopy (TEM) revealed that the CdS nanoparticle was intimately enwrapped by the surrounding TNTs. This unique architecture resulted in the appropriate dispersion of CdS nanoparticles and the intimate multipoint contacts between the CdS nanoparticle and TNTs, which led to significant enhancement of charge separation in CdS/TNTs. Accordingly, the photoactivity was improved. Meanwhile, X-ray powder diffraction (XRD) demonstrated that the highly crystalline hexagonal CdS was obtained in CdS/TNTs, which was also essential for the enhanced photocatalytic performance. The unique morphology and photocatalytic activity of CdS/TNTs were influenced by the Cd/Ti molar ratio with an optimal value of 0.05. Under this condition, the CdS amount was only 6 wt% of the total photocatalyst, which was important from an environmental point of view. The influence of loaded Pt on the activity of CdS/TNTs had also been investigated. The hydrogen production rate of 2.0 wt% Pt-loaded CdS/TNTs reached 353.4 μmol h−1, with the apparent quantum yield of 25.5% at 420 nm. This study provides a potential way to synthesize highly efficient composite photocatalysts with a novel architecture.