Black titania nanotubes/spongy graphene nanocomposites for high-performance supercapacitors
A simple method is demonstrated to prepare functionalized spongy graphene/hydrogenated titanium dioxide (FG-HTiO 2 ) nanocomposites as interconnected, porous 3-dimensional (3D) network crinkly sheets. Such a 3D network structure provides better contact at the electrode/electrolyte interface and faci...
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Veröffentlicht in: | RSC advances 2019-04, Vol.9 (22), p.12555-12566 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A simple method is demonstrated to prepare functionalized spongy graphene/hydrogenated titanium dioxide (FG-HTiO
2
) 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-HTiO
2
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 H
2
SO
4
using cyclic voltammetry (CV) at different potential scan rates, and galvanostatic charge/discharge tests at different current densities. The FG-HTiO
2
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.
A simple method is demonstrated to prepare functionalized spongy graphene/hydrogenated titanium dioxide (FG-HTiO
2
) nanocomposites as interconnected, porous 3-dimensional (3D) network crinkly sheets. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/c9ra01539f |