Synthesis of hierarchical NiS microflowers for high performance asymmertric supercapacitor

Bing Guan, Yu Li, Biyue Yin, Dawei Wang, Huaihao Zhang*, and Changjing Cheng

College of Chemistry and Chemical Engineering, Yangzhou University

Abstract:In this work, the hierarchical NiS microflowers were synthesized usingNi(OH)2 as precursors through sulfuration process. The microstructure and chemicalcomposition of as-prepared NiS was confirmed by means of SEM, TEM, XRD, BETand XPS. The SEM analysis results demonstrated that the NiS microflowers werecomposed of hierarchical nanoplates, and its surface was much rougher compared tothat of Ni(OH)2 templates after sulfidation. Electrochemical characterization revealedthat NiS presented high specific capacitance in 3 M KOH electrolyte (1122.7 F·g-1 atcurrent density of 1 A·g-1) and good electrochemical cycling stability (97.8% of thespecific capacitance is retained after 1000 charge-discharge cycles at current densityof 10 A·g-1). Furthermore, an asymmetric supercapacitor, NiS as the positive electrodeand activated carbon as the negative electrode, delivered high energy density of 31Wh·kg-1 at power density of 0.9 kW·kg-1 under operating voltage window of 1.8 V.

文章链接: http://dx.doi.org/10.1016/j.cej.2016.10.016

Chemical Engineering Journal, 2016, DOI: 10.1016/j.cej.2016.10.016

2016-CEJ-GB