Synthesis of porous Ag2S‒NiCo2S4 hollow architecture as effective electrode material with high capacitive performances

Nanotechnology
Diab KhalafallahZhanglian Hong

Abstract

Fabrication of highly reactive and cost-effective electrode materials is a key to efficient functioning of green energy technologies. Decorating redox-active metal sulfides with conductive dopants is one of the most effective approaches to enhance electric conductivity and consequently boost capacitive properties. Herein, hierarchically hollow Ag2S‒NiCo2S4 architectures were designed with an enhanced conductivity by a simple solvothermal approach. With the favorable porous characteristics and composition, the optimized Ag2S‒NiCo2S4-5 electrode exhibited higher specific capacitance (276.5 mAh g-1 at a current density of 1 A g-1), a good rate performance (56.3% capacity retention at 50 A g-1), and an improved cycling stability (92.4% retention after 2000 cycles). This finding resulted from the enhanced charge transportation ability within the hierarchical structure, abundant electroactive sites, and low contact resistance. In addition, a battery supercapacitor device constructed with the Ag2S‒NiCo2S4-5 as a positive electrode displayed a maximum energy density of 63.3 Wh kg‒1 at an energy density of 821.8 W kg‒1 with an excellent cycling stability (89.4% capacity retention after 10,000 cycles). Therefore, the present work puts fo...Continue Reading

References

Oct 18, 2005·Chemical Communications : Chem Comm·Yong WangHuigang Zhang
Nov 26, 2016·Advanced Materials·Bu Yuan GuanXiong Wen David Lou

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