Double-Layer MnCo₂ S₄ @Ni-Co-S Core/Shell Nanostructure on Nickel Foam for High-Performance Supercapacitor

Abstract

A double‐layer MnCo2S4@Ni‐Co‐S (MCS@NCS) core/shell nanocomposite is successfully deposited on nickel foam using a facile and simple method which includes a hydrothermal treatment and an electrochemical deposition and exhibits excellent electrochemical performance. With the introduction of sulfur via a sulfurization process, the MnCo2S4 nanorods have larger specific surface area compared to the MnCo2O4 nanorods and can serve as porous scaffolds for loading a large amount of additional active materials, facilitating electron transport and ion diffusion. The deposited Ni‐Co‐S nanosheet on MnCo2S4 can further increase the electro‐active surface area and electrical conductivity as well as reinforce the mechanical stability of the whole electrode. Combining both structural and electrochemical advantages, the electrode with MCS@NCS heterostructures has high areal capacitance (10.14 F cm−2 at 1 mA cm−2). An asymmetric supercapacitor with Ni foam‐activated carbon as the negative electrode and Ni foam‐MCS@NCS as the positive electrode is fabricated and shows remarkable high areal capacitance (1.92 F cm−2 at 1 mA cm−2) and good cycling stability (72% capacitance retention after 5000 cycles), demonstrating its great potential as an efficient energy storage device for electronic systems.

Recent Progress in Core@Shell Sulfide Electrode Materials for Advanced Supercapacitor Devices

“…The CoMoS 4 @NiCo‐S electrode presented an excellent capacity retention of 91.3 % after 5,000 cycles, and a rate capability of 68.8 % from 1 to 20 mA cm −2 . Similar results were reported by Yu, Tang and Dai [56] that prepared MnCo 2 S 4 @NiCo‐S on nickel foam substrate by a hydrothermal method followed by electrodeposition. The resultant MnCo 2 S 4 @NiCo‐S electrode showed a capacitance of 10.14 F cm −2 at 1 mA cm −2 , as well as a good rate capability of 82.3 % from 1 to 20 mA cm −2 .…”

“…Similarly, Yu, Tang and Dai [56] synthesized double‐layer MnCo 2 S 4 @NiCo‐S on NF by growing needle‐like MnCo 2 O 4 nanorods directly on NF by hydrothermal method and annealing, followed by sulfurization process to transform it into corncob‐like MnCo 2 S 4 nanorods, used as core for the uniform growth of NiCo−S nanosheets on its surface by electrodeposition (Figure 14A). These structures can be seen in the SEM and TEM images, in which it is possible to observe needle‐like MnCo 2 O 4 nanorods (Figures 14B and 14E), corncob‐like MnCo 2 S 4 nanorods (Figures 14C and 14F) and the MnCo 2 S 4 @NiCo‐S core/shell material (Figures 14D and 14G).…”

NiCo2S4‐Based Composite Materials for Supercapacitors

“…The high capacity may due to the hierarchical and highly porous structure that is help to ion transportation. Some other ternary transition metal sulfides combined with NiCo 2 S 4 such as NiCo 2 S 4 @NiCo 2 S 4 nanotube/nanosheet arrays, CuCo 2 S 4 @NiCo 2 S 4 core‐shell nanostructure, FeCo 2 S 4 @NiCo 2 S 4 nanotubes, MnCo 2 S 4 @Ni‐Co‐S core‐shell nanostructures and hierarchical NiCo 2 S 4 @NiCo x S y core/shell nanoarrays are also reported …”

Anchoring Spinel MnCo2S4 on Carbon Nanotubes as Efficient Counter Electrodes for Quantum Dot Sensitized Solar Cells

“…A spinel-structured MnCo 2 S 4 nanowire array on Ti network by vulcanization of MnCo 2 O 4 was prepared for effective oxygen evolution reaction under alkaline conditions . MnCo 2 S 4 nanosheets are grown on carbon paper and MnCo 2 S 4 @Ni–Co–S core/shell double-layer nanocomposites via electrodeposition followed by low temperature vulcanization for application in Li–O 2 batteries and supercapacitors . Elshahawy et al prepared a controlled sulfadiazine MnCo 2 S 4 nanostructure with an ideal hollow structure by a vulcanization process for high performance hybrid supercapacitors.…”

“…28 application in Li−O 2 batteries 20 and supercapacitors. 29 Elshahawy et al 30 prepared a controlled sulfadiazine MnCo 2 S 4 nanostructure with an ideal hollow structure by a vulcanization process for high performance hybrid supercapacitors.…”