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Issue 22, 2019
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Black titania nanotubes/spongy graphene nanocomposites for high-performance supercapacitors

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Abstract

A simple method is demonstrated to prepare functionalized spongy graphene/hydrogenated titanium dioxide (FG-HTiO2) nanocomposites as interconnected, porous 3-dimensional (3D) network crinkly sheets. Such a 3D network structure provides better contact at the electrode/electrolyte interface and facilitates the charge transfer kinetics. The fabricated FG-HTiO2 was characterized by X-ray diffraction (XRD), FTIR, scanning electron microscopy (FESEM), Raman spectroscopy, thermogravimetric analysis (TGA), UV-Vis absorption spectroscopy, and transmission electron microscopy (TEM). The synthesized materials have been evaluated as supercapacitor materials in 0.5 M H2SO4 using cyclic voltammetry (CV) at different potential scan rates, and galvanostatic charge/discharge tests at different current densities. The FG-HTiO2 electrodes showed a maximum specific capacitance of 401 F g−1 at a scan rate of 1 mV s−1 and exhibited excellent cycling retention of 102% after 1000 cycles at 100 mV s−1. The energy density was 78.66 W h kg−1 with a power density of 466.9 W kg−1 at 0.8 A g−1. The improved supercapacitor performance could be attributed to the spongy graphene structure, adenine functionalization, and hydrogenated titanium dioxide.

Graphical abstract: Black titania nanotubes/spongy graphene nanocomposites for high-performance supercapacitors

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Publication details

The article was received on 28 Feb 2019, accepted on 10 Apr 2019 and first published on 23 Apr 2019


Article type: Paper
DOI: 10.1039/C9RA01539F
RSC Adv., 2019,9, 12555-12566
  • Open access: Creative Commons BY-NC license
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    Black titania nanotubes/spongy graphene nanocomposites for high-performance supercapacitors

    Dalia M. El-Gendy, N. A. Abdel Ghany and N. K. Allam, RSC Adv., 2019, 9, 12555
    DOI: 10.1039/C9RA01539F

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