Facile Construction of 3D Reduced Graphene Oxide Wrapped Ni₃S₂ Nanoparticles on Ni Foam for High‐Performance Asymmetric Supercapacitor Electrodes

Abstract

3D reduced graphene oxide (rGO)‐wrapped Ni3S2 nanoparticles on Ni foam with porous structure is successfully synthesized via a facile one‐step solvothermal method. This unique structure and the positive synergistic effect between Ni3S2 nanoparticles and graphene can greatly improve the electrochemical performance of the NF@rGO/Ni3S2 composite. Detailed electrochemical measurements show that the NF@rGO/Ni3S2 composite exhibits excellent supercapacitor performance with a high specific capacitance of 4048 mF cm−2 (816.8 F g−1) at a current density of 5 mA cm−2 (0.98 A g−1), as well as long cycling ability (93.8% capacitance retention after 6000 cycles at a current density of 25 mA cm−2). A novel aqueous asymmetric supercapacitor is designed using the NF@rGO/Ni3S2 composite as positive electrode and nitrogen‐doped graphene as negative electrode. The assembled device displays an energy density of 32.6 W h kg−1 at a power density of 399.8 W kg−1, and maintains 16.7 W h kg−1 at 8000.2 W kg−1. This outstanding performance promotes the as‐prepared NF@rGO/Ni3S2 composite to be ideal electrode materials for supercapacitors.

CoSe2 Nanoparticles Dispersed in WSe2 Nanosheets for Efficient Electrocatalysis and Supercapacitance Applications

“…Alternatively, supercapacitors could be potential devices to meet the energy demands owing to their excellent performance. For typical examples, pseudocapacitors (a type of supercapacitors) provide a rapid storage of charges via Faradic reactions, thus exhibiting a high energy and power density. , 2D-TMSes have also been recognized as potential electrode materials in pseudocapacitors for energy storage technology because of their rapid charge/discharge rate, good durability, and high power density (>10 kW kg –1 ). − In general, TMSes have been proved to be promising electrode materials for pseudocapacitors; however, their electrochemical performance is affected by the relative low conductivity and aggregation of the materials. ,, There is a need to design hybrid TMSes by nanostructural engineering to tune their electronic and structural properties for the desired architecture, which could boost their conductivity and improve the performance of capacitor materials for charge storage.…”

Facile synthesis of Co and Ce dual-doped Ni3S2 nanosheets on Ni foam for enhanced oxygen evolution reaction

“…These peaks of Co/Ce-Ni3S2/NF and Ni3S2/NF samples were well fitted with representative diffraction patterns in Ni3S2 (JCPDS no. 44-1418), which indicated the well-crystallized in the materials [13]. The signals of Co and Ce component could not be discovered owing to the low content.…”

“…For instance, nickel sulfides have been demonstrated as a promising catalyst due to their numerous excellent performances, especially high activity for OER [10]. Various nickel sulfides nanostructures have been synthesized, such as nanorod/nanowire arrays [11], nanosheets [12], and nanoparticles [13]. Nevertheless, little surface exposed active sites and less rivalrous stability have still hindered their further improvement in electrocatalytic activity.…”

One-Step Synthesis of Self-Supported Ni3S2/NiS Composite Film on Ni Foam by Electrodeposition for High-Performance Supercapacitors

“…The diameter of the semicircle for the samples ( Compared with other reported materials, the material prepared by our work has obvious performance advantages. The specific capacitance value was higher than those of previous nickel sulfide-based materials as supercapacitor electrodes, for instance: nanosheet-based Ni3S2 microspheres on Ni foam (981.8 F g −1 ) [33], porous NiS nanoflake arrays (718 F g −1 ) [34], Ni3S2 on Ni foam with rGO (1462 F g −1 ) [35], 3D graphene/Ni3S2 (741 F g −1 ) [36], 3D reduced graphene oxide wrapped Ni3S2 nanoparticles on Ni Foam (816.8 F g −1 ) [37], Ni3S2@β-NiS materials (1158 F g −1 ) [32], and graphene-coupled flower-like Ni3S2 (1315 F g −1 ) [38]. The enhanced specific capacitance should be attributed to the porous structure formed by interconnected ultra-thin nanoflakes and synergistic effect between Ni3S2 and NiS.…”