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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Efficient visible light-induced photoelectrocatalytic hydrogen production using CdS sensitized TiO2 nanorods on TiO2 nanotube arrays
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Efficient visible light-induced photoelectrocatalytic hydrogen production using CdS sensitized TiO2 nanorods on TiO2 nanotube arrays

机译：在TiO2纳米管阵列上使用CdS敏化的TiO2纳米棒高效产生可见光诱导的光电催化氢

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摘要

A novel CdS/TiO2 nanorods/TiO2 nanotube array (CdS/TNRs/TNT) photocatalyst was prepared. The self-organized highly oriented TiO2 nanotube arrays (TNTs) were first synthesized by anodizing Ti sheets. The "flower-like" rutile TiO2 nanorods (TNRs) were then grafted on the TNTs by a hydrothermal method. Subsequently, the CdS quantum dots (CdS QDs) were deposited on the surface of the resulting TNRs/TNTs using a sequential-chemical bath deposition (S-CBD) method. UV-vis diffuse reflectance spectra indicated that the CdS/TNRs/TNTs sample showed significantly enhanced absorption in the range from 350 to 700 nm. The photoelectrocatalytic hydrogen production activities of all samples were evaluated by using Na2S and Na2SO3 as sacrificial reagents in water under a 300 W Xe lamp with a UV-light filter (lambda > 420 nm). The results showed that CdS/TNRs/TNTs prepared by hydrothermal reactions for 4 h and S-CBD 15 cycles showed a hydrogen production rate approximately 14 times that of the TNTs. When compared to CdS/TNTs, CdS/TNRs/TNTs showed a 2.3 fold increase in hydrogen production, which can be attributed to the enlarged effective deposition area for CdS QDs by depositing "flower-like" rutile TiO2 nanorods on the TNTs. In addition, CdS/TNRs/TNTs exhibited excellent hydrogen production stability using Na2S and Na2SO3 as sacrificial reagents.
机译：制备了新型的CdS / TiO2纳米棒/ TiO2纳米管阵列（CdS / TNRs / TNT）光催化剂。自组织的高度取向的TiO2纳米管阵列（TNT）首先通过阳极氧化Ti片而合成。然后通过水热法将“花状”金红石型TiO2纳米棒（TNR）接枝到TNT上。随后，使用顺序化学浴沉积（S-CBD）方法将CdS量子点（CdS QDs）沉积在所得TNR / TNT的表面上。紫外可见漫反射光谱表明，CdS / TNRs / TNTs样品在350至700 nm范围内显示出明显增强的吸收。通过使用Na2S和Na2SO3作为水中的牺牲试剂，在带有紫外线滤光片（λ> 420 nm）的300 W Xe灯下，评估所有样品的光电催化产氢活性。结果表明，通过水热反应4 h和S-CBD 15个循环制备的CdS / TNRs / TNT的产氢率约为TNT的14倍。与CdS / TNTs相比，CdS / TNRs / TNTs的氢产量增加了2.3倍，这可以归因于通过在TNTs上沉积“花状”金红石型TiO2纳米棒，CdS QDs的有效沉积面积增大。此外，使用Na2S和Na2SO3作为牺牲试剂，CdS / TNRs / TNTs表现出优异的制氢稳定性。

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