Ni-Co sulfide nanowires on nickel foam with ultrahigh capacitance for asymmetric supercapacitors

被引:430
作者
Li, Yanhong [1 ]
Cao, Liujun [2 ]
Qiao, Lei [2 ]
Zhou, Ming [2 ]
Yang, Yang [2 ]
Xiao, Peng [1 ,2 ]
Zhang, Yunhuai [2 ]
机构
[1] Chongqing Univ, Coll Phys, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Coll Chem Engn, Chongqing 400044, Peoples R China
关键词
IN-SITU GROWTH; HIGH-PERFORMANCE; ELECTROCHEMICAL PROPERTIES; CATHODIC DEPOSITION; ENERGY-CONVERSION; NANOSHEET ARRAYS; SO2; ADSORPTION; ELECTRODES; NANOSTRUCTURES; GRAPHENE;
D O I
10.1039/c3ta15373h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper we synthesize well aligned Ni-Co sulfide nanowire arrays (NWAs) with a Ni-Co molar ratio of 1 : 1 on 3D nickel foam by a facile two-step hydrothermal method. Owing to the low electronegativity of sulfur, Ni-Co sulfide NWAs exhibit a more flexible structure and much higher conductivity compared with Ni-Co oxide NWAs when used as active materials in supercapacitors. The electrochemistry tests show that these self-supported electrodes are able to deliver ultrahigh specific capacitance (2415 F g(-1) and 1176 F g(-1) at a current density of 2.5 mA cm(-2) and 30 mA cm(-2), respectively), together with a considerable areal capacitance (6.0 F cm(-2) and 2.94 F cm(-2) at a current density of 2.5 mA cm(-2) and 30 mA cm(-2), respectively), and good rate capability. More importantly, the asymmetric supercapacitor, composed of Ni-Co sulfide NWAs as the positive electrode and activated carbon as the negative electrode, reaches up to an energy density of 25 W h kg(-1) and a power density of 3.57 kW kg(-1) under a cell voltage of 1.8 V. Furthermore, the two assembled supercapacitors in series can power a 3 mm diameter red (2.0 V, 20 mA) round light-emitting diode (LED) indicator for more than 30 minutes after charging separately for a total time of 6 min. The superior electrochemistry capacity demonstrates that the self-standing Ni-Co sulfide nanowire arrays are promising for high-performance supercapacitor applications.
引用
收藏
页码:6540 / 6548
页数:9
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