ZIF-67 derived rGO/NiCo2S4 electrode materials prepared by hydrothermal method for asymmetric supercapacitors

Metal organic framework (MOF) as an electrode material is still a great challenge due to inherent instability and poor electrical conductivity. Herein, we design a material rGO/NiCo2S4, which by using GO and metal organic framework (ZIF-67) as the template and precursor. Additionally, the presence of GO and ZIF-67 can increase specific surface area and provide active sites for redox reactions and shortens ion transport pathways. The synthesized of rGO-10/NiCo2S4 has excellent electrochemical properties as electrode material, which has a high specific capacity of 171 mAh g(-1) and 121.9 mAh g(-1) (1 A g(-1) and 10 A g(-1)). The as-obtained rGO-10/NiCo2S4//AC asymmetric supercapacitor (ASC) of power density is 870 W kg(-1) when the specific energy 41 Wh kg(-1), and with 88.2 % capacitance retention after 5000 cycles at 5 A g(-1). Therefore, the rGO-10/NiCo2S4 derived from ZIF-67 as electrode materials for high-performance asymmetric supercapacitors has a good prospect.

Automated summary

We design a material rGO/NiCo2S4 by using GO and metal organic framework (ZIF-67) as the template and precursor. The presence of GO and ZIF-67 increases specific surface area and provides active sites for redox reactions and shortens ion transport pathways. The synthesized rGO-10/NiCo2S4 exhibits excellent electrochemical properties with high specific capacity and capacitance retention, making it a promising electrode material for high-performance supercapacitors.