In situ growth of NiCo2S4 nanotube arrays on Ni foam for supercapacitors: Maximizing utilization efficiency at high mass loading to achieve ultrahigh areal pseudocapacitance

被引:528
作者
Chen, Haichao [1 ]
Jiang, Jianjun [1 ]
Zhang, Li [1 ]
Xia, Dandan [1 ]
Zhao, Yuandong [1 ]
Guo, Danqing [1 ]
Qi, Tong [1 ]
Wan, Houzhao [1 ]
机构
[1] HUST, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Nanotube arrays; Nickel cobalt sulfide; Supercapacitors; Asymmetric; ELECTRODE MATERIAL; ENERGY-DENSITY; OXIDE; CAPACITANCE; NANOSHEETS; GRAPHENE; CO3O4; NANOSTRUCTURE; HYDROXIDE;
D O I
10.1016/j.jpowsour.2013.12.092
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
Self-standing NiCO2S4 nanotube arrays have been in situ grown on Ni foam by the anion-exchange reaction and directly used as the electrode for supercapacitors. The NiCO2S4 nanotube in the arrays effectively reduces the inactive material and increases the electroactive surface area because of the ultrathin wall, which is quite competent to achieve high utilization efficiency at high electroactive materials mass loading. The NiCO2S4 nanotube arrays hybrid electrode exhibits an ultrahigh specific capacitance of 14.39 F cm(-2) at 5 mA cm(-2) with excellent rate performance (67.7% retention for current increases 30 times) and cycling stability (92% retention after 5000 cycles) at a high mass loading of 6 mg cm(-2). High areal capacitance (4.68 F cm(-2) at 10 mA cm(-2)), high energy density (31.5 Wh kg(-1) at 156.6 W kg(-1)) and high power density (2348.5 W kg(-1) at 16.6 Wh kg(-1)) can be achieved by assembling asymmetric supercapacitor with reduced graphene oxide at a total active material mass loading as high as 49.5 mg. This work demonstrates that NiCO2S4 nanotube arrays structure is a superior electroactive material for high-performance supercapacitors even at a mass loading of potential application-specific scale. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:249 / 257
页数:9
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