Construction of Porous ZnS@Co₃S₄@NiO Nanosheets Hybrid Materials for High‐Performance Pseudocapacitor Electrode by Morphology Reshaping

Abstract

Designing electrode materials with high reversible capacitance is the key to developing high‐performance pseudocapacitors. In this work, a novel ternary hybrid material, porous ZnS@Co3S4@NiO nanosheets are successfully constructed through a morphology reshaping enabled by a hydrothermal method followed by calcination. From a macroscopic view, the introduction of NiO changes the nanorod morphology of ZnS@Co3S4, and forms a porous nanosheet structure. The porous architecture with an increased specific surface area can promote the transport of ions and electrons, accelerate the diffusion of the electrolyte, and offer more active sites for electrochemical reactions. These advantages enhance the electrochemical properties of ZnS@Co3S4@NiO nanosheets when used as electrode materials for supercapacitors. ZnS@Co3S4@NiO nanosheets deliver an initial capacitance of 1418.7 F g−1, and it also reaches 1550.9 F g−1 with a capacitance retention rate of 109.3% at 5 A g−1, after 5000 cycles. However, ZnS@Co3S4 nanorods only deliver an initial capacitance of 708.7 F g−1, and maintain 716.4 F g−1 with a capacitance retention rate of 101.1% after 5000 cycles. These results show that the ZnS@Co3S4@NiO nanosheets are a promising electrode material for high‐performance pseudocapacitor electrode, and morphology reshaping is an effective strategy to design high‐performance pseudocapacitive materials.

Electrochemical Investigation of ZnS/NiO Nanocomposite based Symmetric Supercapattery

“…When the scan rate increases, the redox reaction occurs faster and causes lessening of the electrolyte ion diffusion into the active material lowering the specific capacity [44] . The peak positions of the reduction and oxidation peaks slightly shifted towards positive and negative potentials with the increase of scan rate might be induced by the polarization of the electrode and internal diffusion resistance [45] . However, the features of all CV profiles remained the same with increasing scanning rate revealing prominent rate capability [46] …”

“…[44] The peak positions of the reduction and oxidation peaks slightly shifted towards positive and negative potentials with the increase of scan rate might be induced by the polarization of the electrode and internal diffusion resistance. [45] However, the features of all CV profiles remained the same with increasing scanning rate revealing prominent rate capability. [46] The specific capacity of the ZnS, and ZnS/NiO electrode is inversely associated with the scan rate.…”

In situ fabrication of a robust P–N heterojunction based on Mn–Zn–S–ethylenediamine hybrid nanorods for boosting photocatalytic performance

“…24 Finally, it is particularly important that the electromagnetic and optical properties of such hybrid nanocomposites can be regulated by changing the crystal structure and dimension of inorganic substances and the ligand category of organic amine. 25,26 The properties mentioned above of these hybrid nanocomposites are difficult to possess by any single component, so the MQ-(L) x hybrid can be considered a potential and ideal semiconductor photocatalytic nanocomposite.…”

Facile hydrothermal synthesis of urchin‐like NiCo 2 O 4 as advanced electrochemical pseudocapacitor materials

“…[7][8][9][10][11][12] Generally, transition metal oxides/hydroxides (such as MnO 2 , NiO, Co 3 O 4 , NiCo 2 O 4 , and CoMoO 4 ) and conductive polymers (including polyaniline and polypyrrole) are used in pseudocapacitors. [13][14][15][16][17][18] Researchers have used various methods to obtain many exquisite nanostructures. 19 Among them, important methods for preparing various nanostructures include the hydrothermal method, solvothermal method, microwave radiation method, coprecipitation method, and sol-gel method.…”