Porous Reduced Graphene Oxide/Single-Walled Carbon Nanotube Film as Freestanding and Flexible Electrode Materials for Electrosorption of Organic Dye

• Published in: ACS applied nano materials 2019-10, Vol.2 (10), p.6258-6267
• Main Authors: Yue, Fang, Zhang, Qiang, Xu, Lijian, Zheng, Yiqun, Yao, Chenxue, Jia, Jingna, Leng, Weinan, Hou, Shifeng
• Format: Article
• Language: English
• ISSN: 2574-0970; 2574-0970
• DOI: 10.1021/acsanm.9b01236

Electrosorption is an electrochemically enhanced adsorption, and only a few researchers reported the application of this technology for enhanced removal of organic pollutants. Herein, we report a kind of freestanding and flexible porous reduced graphene oxide/single-walled carbon nanotubes (prGO/SWCNTs) film as electrode material for electrosorption of organic dye. The success of this work relies on the simultaneous integration of graphene and single-walled carbon nanotubes (SWCNTs) into freestanding film and the use of PS to generate macropores to create an all carbon-based flexible electrode with excellent electrochemical properties. The film possesses a highly crumpled surface and 3D interconnected porous internal structure, which could promote the adsorption and diffusion of ions. The film also shows good flexibility, mechanical strength, electrical conductivity, and hydrophilic nature. Upon use as a freestanding electrode, the film exhibits excellent adsorption capacity and good recyclability for methylene blue. The maximum adsorption capacity reaches up to 13014.3 mg g–1. After 5 recycles, the capacity is around 103% of the initial value. These results show that the novel strategy for designing graphene-based freestanding films as flexible electrode to enhance the removal of organic dye and related toxic materials from aquatic environments is feasible.