Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

被引:50
作者
Kumar, Amit [1 ,2 ]
Kumar, Nagesh [2 ,3 ]
Sharma, Yogesh [3 ]
Leu, Jihperng [1 ]
Tseng, Tseung Yuen [2 ]
机构
[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan
[2] Natl Chiao Tung Univ, Inst Elect, Hsinchu 300, Taiwan
[3] IIT Roorkee, Ctr Nanotechnol, Roorkee 247667, Uttar Pradesh, India
来源
NANOSCALE RESEARCH LETTERS | 2019年 / 14卷 / 01期
关键词
Graphene; Reduced graphene oxide; MWCNTs; Specific capacitance; Supercapacitor; Energy and power densities; REDUCED GRAPHENE OXIDE; CARBON NANOTUBES; ELECTROCHEMICAL PROPERTIES; ELECTRODE MATERIALS; PERFORMANCE; PAPER; ENERGY; NANOCOMPOSITE; REDUCTION; SURFACE;
D O I
10.1186/s11671-019-3100-1
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Herein, we report a novel, simple, and cost-effective way to synthesize flexible and conductive rGO and rGO/MWCNT freestanding films. The effects of MWCNT addition on the electrochemical performance of rGO/MWCNT nanocomposite films are investigated in some strong base aqueous electrolytes, such as KOH, LiOH, and NaOH via three-electrode system. The supercapacitor behavior of the films is probed via cyclic voltammetry, galvanostatic charging-discharging, and electrochemical impedance spectroscopy. The structural and morphological studies of the films are performed by X-ray diffractometer, Raman spectrometer, surface area analyzer, thermogravimetric analysis, field emission scanning electron microscope and transmission electron microscope. The rGO/MWCNT film synthesized with 10 wt% MWCNTs (GP10C) exhibits high specific capacitance of 200 Fg(-1), excellent cyclic stability with 92% retention after 15,000 long cycle test, small relaxation time constant (similar to 194 ms), and high diffusion coefficient (7.8457 x 10(-9) cm(2) s(-1)) in 2 M KOH electrolyte. Furthermore, the symmetric supercapacitor coin cell with GP10C as both anode and cathode using 2 M KOH as electrolyte demonstrates high energy density of 29.4 Whkg(-1) and power density of 439 Wkg(-1) at current density 0.1 Ag-1 and good cyclic stability with 85% retention of the initial capacitance at 0.3 Ag-1 after 10,000 cycles. Such a high performance of the GP10C film in the supercapacitor can be ascribed to the large surface area and small hydration sphere radius and high ionic conductivity of K+ cations in KOH electrolyte.
引用
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页数:17
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