One-step electrodeposition fabrication of Ni3S2 nanosheet arrays on Ni foam as an advanced electrode for asymmetric supercapacitors

Abstract

Ni 3 S 2 nanosheet (NS) arrays on Ni foam were fabricated by a simple one-step electrodeposition strategy, and used as a kind of electrode material for asymmetric supercapacitors. The Ni 3 S 2 NS arrays are interconnected, which can be regarded as bridges between these individual nanoparticle units. The electrochemical performances were evaluated by cyclic voltammetry and chronopotentiometry techniques in a three-electrode system. The Ni 3 S 2 NS arrays display a specific capacitance of 773.6 F g −1 at 1 A g −1 , and excellent rate property of 84.3% at 10 A g −1. The performance of the Ni 3 S 2 NS arrays was further investigated in an asymmetric supercapacitor for potential practical application. The asymmetric supercapacitor using the Ni 3 S 2 electrode and reduced graphene oxide electrode as positive and negative electrodes, respectively, exhibits an energy density of 41.2 W h kg −1 at 1.6 kW kg −1. When up to 16 kW kg −1 , it holds 25.3 W h kg −1. These excellent electrochemical performances are attributed to the improved electronic conductivity and rich redox reaction sites from Ni 3 S 2 NS arrays. Our results indicate that the Ni 3 S 2 NS arrays have great potential for supercapacitors.

α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors

“…Supercapacitors store energy by means of fast surface redox reactions (pseudocapacitors) or ion adsorption (electric double layer capacitors, EDLCs). An EDLC containing carbon-based electrodes offer excellent power density and cycling life, whereas pseudocapacitors composed of transition metals and polymers deliver high energy density with good cycling stability and power density [8][9][10][11][12][13][14].…”

Emergence of Ni‐Based Chalcogenides (S and Se) for Clean Energy Conversion and Storage

“…Similarly, different other nickel sulfide phases like Ni 3 S 2 , Ni 3 S 4 , Ni 7 S 6 , Ni 9 S 8 , and composites are explored as promising electrode material for supercapacitors. [ 103,130–135 ] Among those, the highest performance was observed for Ni 3 S 2 nanosheets deposited on 3D hemp‐based AC Ni‐foam via electrodeposition method. As‐prepared 3D hemp AC/Ni 3 S 2 electrode material was used as positive electrode with AC as negative electrode for HSC, which delivered a high energy density of 55.32 W h kg −1 at a power density of 1053.71 W kg −1 .…”

Synthesis of NiCo2S4@NiMoO4 Nanosheets with Excellent Electrochemical Performance for Supercapacitor

“…Transition metal sul de have been proved to be reliable electrode materials for supercapacitor, which have better electron conductivity and cycling stability than metal oxides [12,13]. Among them, NiCo 2 S 4 is considered to be one of the most promising electrode materials for supercapacitors because of its unique atomic structure and electronic properties [14,15]. Especially, NiMoO 4 is provided with high theoretical capacity, excellent rate performance, good conductivity and high redox reversibility.…”