MnO2/SWCNT buckypaper for high performance supercapacitors

被引:11
作者
Gupta, Vinay [1 ]
Kumar, S. [1 ]
机构
[1] Khalifa Univ Sci & Technol, Dept Mech Engn, Masdar Campus, Abu Dhabi 54224, U Arab Emirates
关键词
Single-walled carbon nanotube (SWCNT); Manganese oxide (MnO2); Buckypaper; Electrochemical deposition; Supercapacitor; CARBON NANOTUBES; ELECTROCHEMICAL-DEPOSITION; GRAPHENE MATERIALS; MATERIALS SCIENCE; MNO2; NANOSHEETS; NANOWIRE ARRAYS; OXIDE; ENERGY; FABRICATION; ELECTRODES;
D O I
10.1016/j.est.2019.100960
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
We report the supercapacitive performance of manganese oxide (MnO2)/single-walled carbon nanotube (SWCNT) buckypaper electrodes enabled via electrochemical deposition of MnO2 onto SWCNT buckypaper for the first time. The entangled SWCNT network provides electro-conductive pathways for the charge transfer. We demonstrate that the MnO2/SWCNT buckypaper supercapacitor exhibits a specific capacitance of 605 Fg(-1) and gravimetric energy density of similar to 120 VVhkg(-1). Furthermore, our MnO2/SWCNT buckypaper electrode shows excellent rate capability (85% capacity retention at 20 Ag-1) and long cycle life (1% capacity loss after 10,000 charge/discharge cycles). The excellent performance of MnO2/SWCNT buckypaper supercapacitor is attributed to the flower-like unique hierarchical porous architecture of MnO(2 )around SWCNTs arranged in "pearl necklace" formation, enabling large electrode/electrolyte interface and charge storage surface, better electrolyte penetration, and rapid charge transfer. The results suggest that the MnO2/SWCNT buckypaper electrode can provide excellent supercapacitive performance suitable for future generation electric vehicles.
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页数:7
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