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首页> 外文期刊>RSC Advances >Hydrothermal synthesis of a uniformly dispersed hybrid graphene-TiO2 nanostructure for optical and enhanced electrochemical applications
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Hydrothermal synthesis of a uniformly dispersed hybrid graphene-TiO2 nanostructure for optical and enhanced electrochemical applications

机译：水热合成均匀分散的杂化石墨烯-TiO2纳米结构，用于光学和增强电化学应用

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摘要

Highly dispersed TiO2 nanoparticles on graphene nanosheets were achieved by hydrothermal treatment of graphene nanosheets obtained by modified Hummer's method followed by thermal exfoliation. The hybrid graphene TiO2 nanostructure composite (H-GTN) showed enhanced optical and electrochemical properties for future application as a supercapacitor. The structural, optical and electrochemical properties of the composite are systematically investigated. The as-prepared H-GTN showed a quenching phenomenon of its photoluminescence properties, which was attributed to the specific properties of graphene. Remarkably, the CV test obtained for H-GTN showed a very high specific capacitance value up to 530 F g(-1) at a scan rate of 3 mV s(-1), and nearly stable capacitance of 400 F g(-1) above 20 mV s(-1). The cyclic stability test shows stable behavior after some initial cycles and the stability was then retained without obvious aging or performance degradation, showing long cyclic stability. This is attributed to the excellent electrochemical performance of the H-GTN electrode material for practical application in energy storage devices.
机译：石墨烯纳米片上的高度分散的TiO2纳米粒子是通过对改进的Hummer方法获得的石墨烯纳米片进行水热处理，然后进行热剥离而获得的。杂化石墨烯TiO2纳米结构复合材料（H-GTN）表现出增强的光学和电化学性能，可作为未来的超级电容器应用。系统地研究了复合材料的结构，光学和电化学性能。所制备的H-GTN显示出其光致发光性质的猝灭现象，这归因于石墨烯的特定性质。值得注意的是，针对H-GTN的CV测试显示，在3 mV s（-1）的扫描速率下，高达530 F g（-1）的极高比电容值，以及400 F g（-1）的近乎稳定的电容）高于20 mV s（-1）。循环稳定性测试显示出在某些初始循环后的行为稳定，然后保持了稳定性，而没有明显的老化或性能下降，显示出较长的循环稳定性。这归因于H-GTN电极材料在储能设备中的实际应用中出色的电化学性能。

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