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.

中文翻译：

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顶部或底部组装模块确定由Sn ₃ O ₄和rGO（GQD）组成的片状纳米结构杂化光催化剂的光催化性能

众所周知，Sn ₃ O ₄纳米片具有出色的可见光光催化性能，零波段rGO（还原氧化石墨烯）纳米片具有出色的电子俘获能力诱导的光诱导载流子分离增强能力。因此，将Sn ₃ O ₄纳米片和rGO纳米片集成到制备的杂化纳米结构中已被认为是合成高性能光催化剂的一般策略。然而，组装模块的结构和性能差异，例如在Sn ₃ O ₄纳米薄片上装饰GQD（石墨烯量子点）或分配Sn ₃ O ₄rGO纳米片上的纳米薄片可能是设计高性能Sn ₃ O ₄ / rGO杂化光催化剂的关键。到目前为止，还没有与此主题相关的文献。在此，已经报道了一种简单的微波辅助水热法来制备Sn ₃ O ₄ / GQD和Sn ₃ O ₄ / rGO片状纳米异质结构杂化光催化剂。遵循不同的组装模量的两种光催化剂似乎具有不同的光催化性能。可见光活性的Sn ₃ O ₄ / GQD片状纳米异质杂化物显示出高效稳定的光催化水分解，H ₂的速率（氢）析出达到90μmol/（gh），其速率比Sn ₃ O ₄ / rGO的速率高4.5倍，比良性Sn ₃ O ₄的速率高20倍。已通过光电化学测量，ERS（电子自旋共振光谱）和PL（光致发光）光谱分析研究了其潜在机理。本工作展示了一种用于太阳能高产氢合成高活性光催化剂的简便方法，并给出了石墨烯基片状光催化剂设计的概述。