NDLI: Preparation and electrochemical capacitance of graphene/titanium nitride nanotube array

Content Provider	Royal Society of Chemistry (RSC)
Author	Xie, Yibing Wang, Wei Xia, Chi Tian, Fang Du, Hongxiu Zhou, Yingzhi
Copyright Year	2014
Abstract	Two kinds of graphene composite electrode materials were synthesized on a titanium nitride nanotube array (TiN NTA) and a nickel foam (NF) substrate by a simple adsorption–reduction process, forming a graphene/titanium nitride (G/TiN) NTA and graphene/nickel foam (G/NF). Both the chemical reduction method and the thermal reduction method were used to convert graphene oxide into graphene, forming a G/TiN NTA and thermal reduction graphene/titanium nitride (TRG/TiN) NTA. The morphology and microstructure of the G/TiN NTA, G/NF and TRG/TiN NTA were characterized by scanning electron microscopy, Raman spectra and X-ray diffraction analysis. The electrochemical performance of G/TiN NTA, G/NF and TRG/TiN NTA were investigated by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge measurements. The specific capacitances of G/NF and G/TiN NTA were 198.7 and 333.7 F g−1, respectively, at a current density of 1 A g−1 with respect to the mass of graphene. TiN NTA was more suitable as a substrate material for the graphene composite electrode and G/TiN NTA achieved a higher capacitance performance. Additionally, the specific capacitance of G/TiN NTA and TRG/TiN NTA was 230.7 and 197.9 F g−1, respectively, at a current density of 4 A g−1. This indicated that the chemical reduction method was effective for producing graphene composite electrodes with a higher capacitive performance. An all-solid-state flexible supercapacitor was also constructed using two symmetric G/TiN NTA electrodes and a gel electrolyte of polyvinyl alcohol–potassium hydroxide–potassium iodide, achieving an energy density of 34.2 W h kg−1 and a power density of 11.3 kW kg−1.
Starting Page	41856
Ending Page	41863
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	79
Journal	RSC Advances
DOI	10.1039/c4ra05020g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Electrode Energy density Scanning electron microscope X-ray crystallography Cyclic voltammetry Electrolyte Graphene Electrochemistry Supercapacitor Capacitance NTA Raman Nickel Nitride Electric current Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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