Mesoporous nickel sulphide nanostructures for enhanced supercapacitor performance

被引:76
作者
Muthu, Nandhini Sonai [1 ]
Gopalan, Muralidharan [1 ]
机构
[1] Gandhigram Rural Inst Deemed Be Univ, Dept Phys, Dindigul 624302, Tamil Nadu, India
关键词
Supercapacitor; Ni3S4; nanoflakes; KOH electrolyte; Symmetric device; High surface area; REDUCED GRAPHENE OXIDE; NITROGEN-DOPED GRAPHENE; ELECTRODE MATERIAL; HYDROTHERMAL SYNTHESIS; ELECTROCHEMICAL PERFORMANCES; ASYMMETRIC SUPERCAPACITORS; HOLLOW SPHERES; BETA-NIS; FOAM; COMPOSITE;
D O I
10.1016/j.apsusc.2019.02.250
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
The nanostructured electrode material with high surface area, good porous texture and appropriate pore-size distribution are facilitating more active sites for accumulation of ions and a large rate of ionic diffusion. Here, the mesoporous Ni3S4 nanostructures were prepared through a one-pot hydrothermal method. Annealing temperature which is known to affect the structural, morphological and electrochemical properties of the nanostructure has been optimized. Mesoporous Ni3S4 nanoflakes show a high surface area of 73 m(2) g(-1) at an annealing temperature of 200 degrees C (N2). This porous nanostructure exhibits a high specific capacitance of 1184 +/- 71 to 548 +/- 9 F g(-1) at realistic specific currents of 5 to 40 A g(-1). The symmetric two-electrode system (N2//N2) made up of mesoporous nanoflakes delivers a maximum energy density of 9 Wh kg(-1) at 2 A g(-1) and maximum power density of 4.6 kW kg(-1) at 40 A g(-1). It retains 72% of initial capacitance after 5000 repeated cycling process. In addition, we have used two such symmetric devices to power a red LED. It demonstrates the intrinsic capability of porous Ni3S4 nanoflakes annealed at 200 degrees C to offer enhanced electrochemical performance and further appear to be a promising electrode material for real-life supercapacitors.
引用
收藏
页码:186 / 198
页数:13
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