One-Pot Self-Assembled Three-Dimensional TiO2-Graphene Hydrogel with Improved Adsorption Capacities and Photocatalytic and Electrochemical Activities

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• 作者：Zheye Zhang ; Fei Xiao ; Yunlong Guo ; Shuai Wang ; Yunqi Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：March 27, 2013
• 年：2013
• 卷：5
• 期：6
• 页码：2227-2233
• 全文大小：415K
• 年卷期：v.5,no.6(March 27, 2013)
• ISSN：1944-8252

文摘

We reported the development of a new type of multifunctional titanium dioxide (TiO₂)-graphene nanocomposite hydrogel (TGH) by a facile one-pot hydrothermal approach and explored its environmental and energy applications as photocatalyst, reusable adsorbents, and supercapacitor. During the hydrothermal reaction, the graphene nanosheets and TiO₂ nanoparticles self-assembled into three-dimensional (3D) interconnected networks, in which the spherical nanostructured TiO₂ nanoparticles with uniform size were densely anchored onto the graphene nanosheets. We have shown that the resultant TGH displayed the synergistic effects of the assembled graphene nanosheets and TiO₂ nanoparticles and therefore exhibited a unique collection of physical and chemical properties such as increased adsorption capacities, enhanced photocatalytic activities, and improved electrochemical capacitive performance in comparison with pristine graphene hydrogel and TiO₂ nanoparticles. These features collectively demonstrated the potential of 3D TGH as an attractive macroscopic device for versatile applications in environmental and energy storage issues.

Keywords:

titanium dioxide nanoparticles; graphene hydrogel; self-assembly; photocatalyst; adsorbents; supercapacitor