Construction of desirable NiCo2S4 nanotube arrays on nickel foam substrate for pseudocapacitors with enhanced performance

被引：214
作者：
Cai, Daoping [1 ]
Wang, Dandan [1 ]
Wang, Chenxia [1 ]
Liu, Bin [1 ]
Wang, Lingling [1 ]
Liu, Yuan [1 ]
Li, Qiuhong [1 ]
Wang, Taihong [1 ]
机构：
[1] Xiamen Univ, Pen Tung Sah Inst Micronano Sci & Technol, Xiamen 361000, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2015年 / 151卷
基金：
中国国家自然科学基金;
关键词：
Ni-Co sulfides; nanotube; electrode material; binder-free; supercapacitor; BINDER-FREE ELECTRODES; ENERGY-CONVERSION; NANOWIRE ARRAYS; GRAPHENE; NANOSTRUCTURES; NANOPARTICLES; DESIGN; SUPERCAPACITORS; CAPACITANCE; COMPOSITES;
D O I：
10.1016/j.electacta.2014.11.040
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Ternary NiCo2O4 synthesized via annealing NiCo-precursor has been extensively studied as an advanced electrode material for high-performance supercapacitors. In this work, we demonstrate a facile hydrothermal synthesis of NiCo2S4 nanotube arrays (NTAs) by simply treating the NiCo-precursor with Na2S solution based on the Kirkendall effect. The NiCo2S4 NTAs grown on nickel foam substrate are directly evaluated as binder-free electrode for supercapacitors. Impressively, the NiCo2S4 NTA electrode delivers an ultrahigh capacitance of 15.58 F cm(-2) at a current density of 10 mA cm(-2), which is much higher than 3.63 F cm(-2) of the mesoporous NiCo2O4 nanowire array (NWA) electrode. In addition, the NiCo2S4 NTA electrode also exhibits good cycling stability with 79.3% capacitance retention at high current density of 60 mA cm(-2) after 2000 cycles. In view of the excellent electrochemical performance and the facile and cost-effective synthesis, such NiCo2S4 NTA electrode would hold great promise for high-performance supercapacitor applications in future. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：35 / 41
页数：7
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