Rapid microwave-assisted syntheses of reduced graphene oxide (RGO)/ZnIn2S4 microspheres as superior noble-metal-free photocatalyst for hydrogen evolutions under visible light
Rapid microwave-assisted syntheses of reduced graphene oxide (RGO)/ZnIn2S4 microspheres as superior noble-metal-free photocatalyst for hydrogen evolutions under visible light
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微波辅助快速合成还原氧化石墨烯 (RGO)/ZnIn2S4 微球作为可见光下析氢的优质无贵金属光催化剂
DOI：
10.1016/j.apcatb.2014.06.012
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发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
Li, Zhaohui
中科院分区：
文献类型：
--
作者：
Ye, Lin;Li, Zhaohui
采用微波辅助快速制备了由ZnIn 2S 4和RGO纳米片交织而成的花状RGO/ZnIn 2S 4微球。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、拉曼光谱、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和高分辨透射电子显微镜（HRTEM）对样品进行了表征。提出了微波辅助法制备RGO/ZnIn 2S 4纳米复合花状微球的机理。与溶剂热法制备的样品相比，微波辅助法制备的RGO/ZnIn 2S 4微球在可见光照射下表现出更高的光催化析氢性能，这是由于ZnIn 2S 4与RGO之间存在较强的相互作用。在最佳RGO负载量为1.0 wt%时观察到的最高析氢速率（132.3 μmol h−1）与1.0 wt%-Pt/ZnIn 2S 4（129.0 μmol h−1）相当。这项工作证明了微波加热在RGO基材料的制备中所发挥的重要作用。结果还突出了在光催化析氢过程中使用RGO作为非贵金属助催化剂的潜力。
A rapid microwave-assisted method has been developed for the preparations of flower-like RGO/ZnIn2S4microspheres which are consisted of interwoven nanosheets of ZnIn2S4and RGO. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The mechanism for the formation of the flower-like microspheres of RGO/ZnIn2S4nanocomposites via the microwave-assisted method has been proposed. As compared with the samples obtained solvothermally, the RGO/ZnIn2S4microspheres obtained via the microwave-assisted method show highly enhanced photocatalytic performance for hydrogen evolution under visible light irradiations, due to the existence of strong interaction between ZnIn2S4and RGO. The highest hydrogen evolution rate (132.3 μmol h−1), observed over an optimum RGO loading amount of 1.0 wt%, is comparable to that over 1.0 wt%-Pt/ZnIn2S4(129.0 μmol h−1). This work demonstrates the important role played by microwave heating in the preparations of RGO-based materials. The results also highlight the potential of using RGO as a non-noble metal cocatalyst in the photocatlaytic hydrogen evolution process.
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