A MoS2/6,13-pentacenequinone composite catalyst for visible-light-induced hydrogen evolution in water
A MoS2/6,13-pentacenequinone composite catalyst for visible-light-induced hydrogen evolution in water
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DOI：
10.1016/j.apcatb.2015.07.030
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发表时间：
2016-02
影响因子：
22.1
通讯作者：
Yongjun Yuan;Zhentao Yu;Yong-Hui Li;Hongwei Lu;Xin Chen;Wenguang Tu;Z. Ji;Z. Zou
中科院分区：
文献类型：
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作者：
Yongjun Yuan;Zhentao Yu;Yong-Hui Li;Hongwei Lu;Xin Chen;Wenguang Tu;Z. Ji;Z. Zou
以MoS 2纳米片为助催化剂，6，13-并五苯醌（PQ）在光驱动下对水溶液中的析氢反应具有催化活性.采用简单的方法制备了MoS 2/PQ复合光催化剂，并利用X射线衍射（XRD）、拉曼光谱、高分辨透射电子显微镜（HRTEM）、X射线光电子能谱（XPS）和紫外-可见光谱（UV-vis）对复合光催化剂进行了表征。在PQ表面引入了层状MoS 2作为电子陷阱。这允许活性位点有效地促进光生载流子的分离，从而促进从水中光催化产生氢。采用三乙醇胺（TEOA）作为牺牲还原剂，考察了MoS 2负载量对PQ形貌和反应pH值的影响.结果表明，在可见光（λ> 420 nm）照射下，当MoS 2质量分数为0.5%时，MoS 2/PQ复合光催化剂的产氢速率最高，为79.5 μmol h−1g− 1，超过了Pt负载PQ（Pt/PQ）光催化剂的最佳产氢活性。该多相催化剂可以很容易地回收和循环使用至少三次，而没有显着的活性损失。这项研究为使用不含贵金属的复合光催化剂进行太阳能转化提供了新的见解，这些光催化剂对环境友好，并且对可见光敏感。
6,13-Pentacenequinone (PQ) actively catalyzed the light-driven evolution of hydrogen in water when using MoS2nanosheets as cocatalyst. The MoS2/PQ composite photocatalyst was prepared via a facile procedure and was fully characterized by X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy and UV–vis spectroscopy. Layered MoS2was incorporated on the PQ surface and served as electron traps. This allowed active sites to efficiently promote the separation of photogenerated carriers, thus facilitating the photocatalytic production of hydrogen from water. The effects of the MoS2loading on the PQ morphology and the pH of the reaction have been evaluated using triethanolamine (TEOA) as a sacrificial reductant. The photocatalytic results showed that the MoS2/PQ composite photocatalyst manifested the highest H2production rate of 79.5 μmol h−1g−1under visible light irradiation (λ> 420 nm) at a MoS2concentration of 0.5 wt%, which exceeds the optimized photocatalytic H2evolution activity of Pt-loaded PQ (Pt/PQ) photocatalyst. The heterogeneous catalyst could be readily recovered and recycled at least three times without a significant loss of activity. This study provides new insights into solar-to-energy conversion using composite photocatalysts that are free of noble metals, are environmentally friendly and are responsive to visible light.