Facile synthesis and superior electrochemical performances of CoNi₂S₄/graphene nanocomposite suitable for supercapacitor electrodes

Abstract

CoNi2S4/graphene nanocomposite electrodes exhibit excellent pseudocapacitance behavior enhanced by synergistic effect, demonstrating the nanocomposite's promise as an electrode material for high-performance supercapacitors.

Synthesis and remarkable capacitive performance of reduced graphene oxide/silver/nickel-cobalt sulfide ternary nanocomposites

“…Specifically, the RGO/Ag/NiCo 2 S 4 -3 nanocomposite electrode exhibits a high energy density of 54.2 W h Kg -1 at a power density of 400.0 W kg -1 , and still remains 31.3 W h Kg -1 at a higher power density of 3999.6 W kg -1 . Obviously, RGO/Ag/NiCo 2 S 4 -3 nanocomposite exhibits much higher specific capacitance and energy density as compared with other nickel cobalt sulfide nanomaterials or RGO/nickel cobalt sulfide nanocomposites[12,13,25,44,49]. The results are shown inTable 2.…”

“…The specific capacitances from CV curves are calculated by the formula: C s =(∫IdV)/(νm△V), where I is the response current, △V is the potential difference, ν is the potential scan rate, and m is the mass of the active materials in the electrodes [41]. Clearly, the specific capacitance is proportional to the integral area of CV curves at the same scan rate [25,42]. nanocomposites.…”

“…Compared with zero-dimensional carbon nanoparticles and one-dimensional carbon nanotubes, graphene with two-dimensional structure is easier and more flexible to integrate with other components. Graphene/metal oxides or sulfides composite electrodes have been widely investigated recently [23][24][25]. It is found that the introduction of graphene as a flexible matrix could effectively improve the electrochemical performance of active components.…”

“…In addition, the charge/discharge efficiency (η), also called Coulombic efficiency, is an important parameter to evaluate the reversibility of the electrode. The equation is applied as follows:η = t d /t c × 100%,where t c and t d are the charge and discharge times, respectively[25]. The RGO/Ag/NiCo 2 S 4 -3 nanocomposite electrode shows a high electrochemical reversibility with Coulombic efficiency of more than 99% during the entire cycling test.…”

Our Contributions in Nanochemistry for Antibiosis, Electrocatalyst and Energy Storage Materials

“…[36] With 1 %, 3 %, 5 %, 10 % and 30 % loaded amount of GR, the CoNi 2 S 4 /graphene nanocomposite (CNS@1 %GR, CNS@3 %GR, CNS@5 %GR, CNS@10 %GR and CNS@30 %GR) were set to make a comparison. According to data, different GR-loads exerted various effects on property.…”