Cathodic Deposition of Flaky Nickel Sulfide Nanostructure as an Electroactive Material for High-Performance Supercapacitors

Abstract

In this current work, a flaky nickel sulfide (Ni3S2) nanostructure was deposited on a Ni foam substrate using a facile potentiodynamic deposition approach and investigated as an electroactive material for high-performance supercapacitor for the first time. X-ray diffraction, scanning electron microscopy and transmission electron microscopy confirmed that the as-prepared Ni3S2 nanostructure was assembled from intercrossing nanoflakes, thus facilitating the electrolyte penetration. The flaky Ni3S2 nanostructure showed a high specific capacitance as well as 717 F g−1 at 2 A g−1, and a remarkable rate capability, in which a promising specific capacitance of 411 F g−1 can still be delivered at 32 A g−1. Moreover, the flaky Ni3S2 nanostructure demonstrated an impressive excellent cycling performance that ∼91% of retention in the specific capacitance can still be made after cycling of 500–1000 consecutive charge/discharge tests at a relatively high current density of 4 A g−1. As a result, the flaky Ni3S2 nanostructure can be considered as a promising electroactive material for high-performance SCs.

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

“…The semicircle in the higher frequency is associated with surface properties of porous electrode, which corresponds to the chargetransfer resistances (R ct ). At the lower frequency, the linear line is related to the Warburg impedance or diffusion resistance [44]. The R s and R ct values of Co 3 O 4 nanofibers is found to be 0.4 V and 1.6 V, respectively.…”

Carbon coated nickel sulfide/reduced graphene oxide nanocomposites: facile synthesis and excellent supercapacitor performance

“…4a shows the CV curves of the CCNS-RGO, CCNS and RGO electrodes at the scan rate of 5 mV s -1 . The CV curves of CCNS-RGO and CCNS electrodes exhibit a pair of redox peaks ranging from 0 to 0.50 V. According to previous reports, the anodic peak in the potential range of 0.30-0.40 V is due to the conversion from Ni 3 S 2 to Ni 3 S 2 (OH) 3 (reaction 1), while the cathodic peak in the range of 0.15-0.25 V corresponds to the reverse process [31,49,50].…”

“…Compared with previously reported Ni 3 S 2 based electrodes, the CCNS-RGO composites exhibit comparable and even better capacitive performance [31,49,[58][59][60][61].…”

“…For instance, a flaky Ni 3 S 2 prepared by potentiodynamic deposition exhibits a specific capacitance of 717 F g -1 at the current density of 2.0 A g -1 [49]. Ni 3 S 2 nanoparticles grown on carbon nanotubes exhibit a maximum specific capacitance of 800 F g -1 at the current density of 3.2 A g -1 [31,58].…”

Electrochemical Studies of Microwave Synthesised Bimetallic Sulfides Nanostructures As Faradaic Electrodes.

“…To address this issue and improved on the electrochemical performance, mixed metal oxides, transition metal sulfides including both binary and ternary materials with stoichiometric composition have recently been investigated as novel pseudocapacitive materials for supercapacitors due to their outstanding electrochemical properties, rich redox reactions involving different ions, complex chemical compositions and their synergetic effects [13][14][15][16][17]. Compared to single and simple metal oxides, mixed metal oxides or sulfides exhibit variable oxidation state, high electrical conductivity due to lower activation energy for electron transfer between cations [18][19][20].…”