3 NiCo2S4/NiOH2 - Preparation method of 3D hierarchical mesoporous NiCo2S4/NiOH2 core-shell nanosheet arrays on 3-dimensional conductive carbon electrode and its application to high performance supercapacitors

摘要

The present invention relates to a preparation method of a 3D hierarchical mesoporous NiCo_2S_4/Ni(OH)_2 core-shell nanosheet array on a conductive carbon electrode. The NiCo_2S_4/Ni(OH)_2 core-shell nanosheet array can be directly grown on the conductive carbon electrode through an electrochemical adhesion method so that an electrode having a large number of pore layers can be formed. Thus, the transport path of the electrolyte ion can be reduced during the charging/discharging process of a supercapacitor so that the trapping of the electrolyte ion and the access to the porous structure can be facilitated. In addition, the NiCo_2S_4/Ni(OH)_2 core-shell nanosheet array having the hierarchical mesoporous structure on the 3D conductive carbon electrode is applied to the supercapacitor, so that a high storage capacity of 209 mAh/cm^2 is obtained at a current density of 20 mA/cm^2 and a storage capacity is reduced only by 5.5% after use of 2000 times so that long-term circulation stability can be realized.