a novel electrode for a high capacitance supercapacitor by using nickel sulfide/copper sulfide composite derived from metal organic frameworks

Abstract: in view of the importance of rational design of novel nanocomposites for high performance supercapacitors to achieve high energy and power density and high rate capability, we have presented a promising and facile strategy for fabrication of a mixed-metal sulfide composed of ni3s2 and cu-mof-derived cuxs. cuxs/ni3s2 has been synthesized by using in situ conversion of host cu-mof during deposition of ni3s2 on its surface through a simple hydrothermal method. then, the prepared cuxs-mof/ni3s2 was encapsulated with mwcnt using ultrasonication. placement of the nanocomposite hybrid material on graphite foil (gf) resulted in superior capacitive properties and stability for use in electrochemical supercapacitors. the synergistic effect of the components in cuxs/ni3s2@mwcnt/gf showed excellent supercapacitor performance [1-5]. the composite electrode was characterized by several methods (xrd, xps, ft-ir, sem, tem, edx and bet). in addition, electrochemical methods such as cv, gcd and eis were used to investigate the electrochemical properties of the fabricated electrode. electrochemical performance of cuxs/ni3s2@mwcnt/gf exhibited a great improvement in capacitive properties. it showed an extremely large electrochemical surface area (ecsa = 1779 cm2), which is of primary importance in supercapacitors. cuxs/ni3s2@mwcnt/gf electrode achieved an outstanding capacitance of 1388.7 f g−1 at 1 a g−1, superior rate capability of 1211.2 f g−1 at 11.6 a g−1 (87.2 %), and excellent cycling stability (108% after 10,000 gcd cycles at 33.3 a g-1). due to the easy synthetic route, this paves the way for a new perspective for high energy and power storage applications in the energy storage sectors.