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

Shang Wu,Xin Xu,Xin Sun,Sheng Zhou,Chaoyang Liu,Penghui Zhang,Shuaishuai Fu,Hong Zhang,Shaofeng Pang,Xia Wang,Quanlu Yang

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/NiCo 2 S 4 , 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/NiCo 2 S 4 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/NiCo 2 S 4 //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/NiCo 2 S 4 derived from ZIF-67 as electrode materials for high-performance asymmetric supercapacitors has a good prospect.