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Double‐Layer MnCo 2 S 4 @Ni‐Co‐S Core/Shell Nanostructure on Nickel Foam for High‐Performance Supercapacitor
Author(s) -
Yu Kun,
Tang Wing Man,
Dai Jiyan
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800147
Subject(s) - supercapacitor , materials science , nanorod , electrode , nanosheet , capacitance , electrochemistry , nanocomposite , nickel , chemical engineering , nanotechnology , nanostructure , metallurgy , chemistry , engineering
A double‐layer MnCo 2 S 4 @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 MnCo 2 S 4 nanorods have larger specific surface area compared to the MnCo 2 O 4 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 MnCo 2 S 4 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.