Synthesis of reduced graphene oxide wrapped-copper sulfide hollow spheres as electrode material for supercapacitor

Free-Standing PVDF/Reduced Graphene Oxide Film for All-Solid-State Flexible Supercapacitors towards Self-Powered Systems

“…Figure 3B shows the Raman bands of the PVDF/reduced graphene oxide composite film exhibits the characteristic Raman vibrational bands of graphene. The band at 1357 and 1599 cm −1 corresponds to the D and G band of the graphene in the PVDF matrix [41], and the other bands in the region of 700 to 1000 cm −1 corresponds to the characteristic band of PVDF [42]. The surface morphology and the elemental mapping analysis of PVDF/reduced graphene oxide composite film are shown in Figure 3C-G. Figure S4A,B show the FE-SEM micrograph of reduced graphene oxide resembling the sheet like morphology.…”

Facile synthesis of nanoporous CuS nanospheres for high-performance supercapacitor electrodes

“…Pseudocapacitors such as metal oxides/hydroxides offer much higher specific capacitance and energy density than EDLCs (carbonaceous materials) [4][5][6] . Very recently, various transition metal sulfides such as CoS [7] , NiS [8] , ZnS [9] , SnS [10] , CuS [11][12][13] , CuCo 2 S 4 [14] , CoNi 2 S 4 [15] and NiCo 2 S 4 [16] are receiving increasing attention as pseudocapacitive electrode materials due to high electrochemical performance, rich valences, more complex valence states compared to oxides, and good chemical stability [17] . Among these transition metal sulfides, CuS is a promising candidate due to its low cost, elemental abundance, various shapes at the nanoscale and metal-like electronic conductivity (10 −3 S/cm) [11,18] .…”

Carbon coated copper sulfides nanosheets synthesized via directly sulfurizing Metal-Organic Frameworks for lithium batteries

“…Recently, metal sulfides, such as Co 9 S 8 , FeS 2 and CuS, have been investigated as electrode materials for lithium battery, owing to their high theoretical energy densities and good electronic conductivity [3][4][5][6][7]. However, the rapid capacity fading caused by the drastic volume expansion and the dissolution of lithium polysulfides during charge/discharge cycling restrict its electrochemical performance [8].…”

“…However, the rapid capacity fading caused by the drastic volume expansion and the dissolution of lithium polysulfides during charge/discharge cycling restrict its electrochemical performance [8]. In order to overcome the issue, many efforts have made by designing nanostructures to alleviation the volume expansion and introducing coating to restrict the lithium polysulfides dissolution [7,9,10]. For example, Zhou et al [9] reported that sub-10 nm copper sulphide rods exhibit excellent cycle performance (250 cycles with a sustainable capacity of 390 mA h g À 1 ).…”