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Synthesis of Particulate Hierarchical Tandem Heterojunctions toward Optimized Photocatalytic Hydrogen Production
Advanced Materials ( IF 27.4 ) Pub Date : 2018-09-10 , DOI: 10.1002/adma.201804282 Bojing Sun 1 , Wei Zhou 1 , Haoze Li 1 , Liping Ren 1 , Panzhe Qiao 1 , Wei Li 2 , Honggang Fu 1
Advanced Materials ( IF 27.4 ) Pub Date : 2018-09-10 , DOI: 10.1002/adma.201804282 Bojing Sun 1 , Wei Zhou 1 , Haoze Li 1 , Liping Ren 1 , Panzhe Qiao 1 , Wei Li 2 , Honggang Fu 1
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Photocatalytic hydrogen production using semiconductors is identified as one of the most promising routes for sustainable energy; however, it is challenging to harvest the full solar spectrum in a particulate photocatalyst for high activity. Herein, a hierarchical hollow black TiO2/MoS2/CdS tandem heterojunction photocatalyst, which allows broad‐spectrum absorption, thus delivering enhanced hydrogen evolution performance is designed and synthesized. The MoS2 nanosheets not only function as a cost‐effective cocatalyst but also act as a bridge to connect two light‐harvesting semiconductors into a tandem heterojunction where the CdS nanoparticles and black TiO2 spheres absorb UV and visible light on both sides efficiently, coupling with the MoS2 cocatalyst into a particulate photocatalyst system. Consequently, the photocatalytic hydrogen rate of the black TiO2/MoS2/CdS tandem heterojunction is as high as 179 µmol h−1 per 20 mg photocatalyst under visible‐light irradiation, which is almost 3 times higher than that of black TiO2/MoS2 heterojunctions (57.2 µmol h−1). Most importantly, the stability of CdS nanoparticles in the black TiO2/MoS2/CdS tandem heterojunction is greatly improved compared to MoS2/CdS because of the formation of tandem heterojunctions and the strong UV‐absorbing effect of black TiO2. Such a tandem architectural design provides new ways for synthesizing particulate photocatalysts with high efficiencies.
中文翻译：
颗粒级联串联异质结的合成以优化光催化制氢
使用半导体生产光催化制氢被认为是可持续能源最有前途的途径之一。但是，要获得高活性，要在颗粒状光催化剂中收获完整的太阳光谱具有挑战性。在此，设计并合成了一种分级空心黑色TiO 2 / MoS 2 / CdS串联异质结光催化剂，该催化剂可以吸收广谱，从而提高析氢性能。MoS 2纳米片不仅充当具有成本效益的助催化剂，而且还充当将两个光收集半导体连接到串联异质结中的桥梁，其中CdS纳米颗粒和黑色TiO 2球体有效地吸收了两侧的紫外线和可见光，并与MoS 2助催化剂偶联成颗粒状光催化剂体系。因此，可见光照射下，黑色TiO 2 / MoS 2 / CdS串联异质结的光催化氢速率高达179 µmol h -1 / 20 mg光催化剂，几乎是黑色TiO 2 /的3倍。MoS 2异质结（57.2 µmol h -1）。最重要的是，与MoS 2相比，黑色TiO 2 / MoS 2 / CdS串联异质结中CdS纳米颗粒的稳定性大大提高了/ CdS是因为形成了串联异质结以及黑色TiO 2具有很强的紫外线吸收作用。这种串联式建筑设计提供了高效合成颗粒状光催化剂的新方法。
更新日期：2018-09-10
中文翻译：
颗粒级联串联异质结的合成以优化光催化制氢
使用半导体生产光催化制氢被认为是可持续能源最有前途的途径之一。但是，要获得高活性，要在颗粒状光催化剂中收获完整的太阳光谱具有挑战性。在此，设计并合成了一种分级空心黑色TiO 2 / MoS 2 / CdS串联异质结光催化剂，该催化剂可以吸收广谱，从而提高析氢性能。MoS 2纳米片不仅充当具有成本效益的助催化剂，而且还充当将两个光收集半导体连接到串联异质结中的桥梁，其中CdS纳米颗粒和黑色TiO 2球体有效地吸收了两侧的紫外线和可见光，并与MoS 2助催化剂偶联成颗粒状光催化剂体系。因此，可见光照射下，黑色TiO 2 / MoS 2 / CdS串联异质结的光催化氢速率高达179 µmol h -1 / 20 mg光催化剂，几乎是黑色TiO 2 /的3倍。MoS 2异质结（57.2 µmol h -1）。最重要的是，与MoS 2相比，黑色TiO 2 / MoS 2 / CdS串联异质结中CdS纳米颗粒的稳定性大大提高了/ CdS是因为形成了串联异质结以及黑色TiO 2具有很强的紫外线吸收作用。这种串联式建筑设计提供了高效合成颗粒状光催化剂的新方法。
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