Top or Bottom, Assembling Modules Determine the Photocatalytic Property of the Sheetlike Nanostructured Hybrid Photocatalyst Composed with Sn3O4 and rGO (GQD)
2018
Yu, Xin | Zhao, Zhenhuan | Ren, Na | Liu, Jing | Sun, Dehui | Ding, Longhua | Liu, Hong
The outstanding visible-light photocatalytic properties of Sn₃O₄ nanosheets and excellent electron-trapping-ability-induced photoinduced-carrier-separation enhancement ability of zero-band rGO (reduced graphene oxide) nanosheets are well-known. Therefore, integration of Sn₃O₄ nanosheets and rGO nanosheets to prepared hybrid nanostructures has been thought of as a general strategy for synthesis of high-performance photocatalysts. However, the structural and property difference of assembling modules, such as decoration of GQDs (graphene quantum dots) on Sn₃O₄ nanoflakes, or distributing Sn₃O₄ nanoflakes on rGO nanosheets, could be the key to design high-performance Sn₃O₄/rGO hybrid photocatalysts. Up to now, there is no literature relating to this topic. Here, a simple microwave-assisted hydrothermal method has been reported for the fabrication of Sn₃O₄/GQD and Sn₃O₄/rGO sheetlike nano-heterostructured hybrid photocatalysts. Two photocatalysts following a different assembling modulus appeared to have different photocatalytic performances. The visible-light-active Sn₃O₄/GQD sheetlike nano-heterostructured hybrids show efficient and stable photocatalytic water splitting, the rate of H₂ (hydrogen) evolution reaching 90 μmol/(g h), a rate 4.5 times higher than that of Sn₃O₄/rGO and 20 times than that of benign Sn₃O₄. The underlying mechanism has been investigated by photoelectrochemical measurement, ERS (electron spin-resonance spectroscopy), and PL (photoluminescence) spectra analysis. The present work demonstrates a facile method for synthesizing highly active photocatalysts for solar hydrogen generation, and gave an outline for the design of graphene-based sheetlike photocatalysts.
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