Preparation of metal sulfide electrode materials derived based on metal organic framework and application of supercapacitors

• The morphology and properties of Fe-MIL-88 were improved by adding Co element. • Fe .92 Co .08 S@NiS/NiO was prepared by two-step solvothermal method. • The electrochemical properties of Fe .92 Co .08 S@NiS/NiO was evaluated. • We provided a new idea for the preparation of ternary metal sulfides based on MOFs. A new type of layered multi-space composite material was synthesized by solvothermal method based on the spindle shape of FeCo-MIL-88 sulfide, nickel sulfide and nickel oxide (Fe .92 Co .08 S@NiS/NiO). The morphology and structure of the hybrid were studied by SEM, TEM, XRD and XPS. The lamellar structure provided a large gap for effective electron transfer, and the composite showed significant electrochemical properties. This includes excellent specific capacitance (1868 F·g −1 at 1 A·g −1 ) and significant cycle stability (the specific capacitance remains at 62.5% after 5000 cycles). In addition, when the asymmetric supercapacitor is 251.1 W·kg −1 , the energy density is 38.2 Wh·kg −1 , and the cycle stability is excellent after 5000 cycles, and the capacity retention rate is 85.3%. The results show that Fe .92 Co .08 S@NiS/NiO composite electrode has potential application in high performance supercapacitors. This new material has strong competitive potential in high-performance ultracapacitor electrode materials.