Hierarchical structure NiCo2O4/NiMoO4 supported by carbon cloth for high-performance supercapacitors

NiCo 2 O 4 /NiMoO 4 hierarchical composite structure is used for high-performance supercapacitors electrode materials. The electrode material is grown directly on the conductive carbon cloth, which effectively reduces the contact resistance between the collector and the active material, and provides a favorable skeleton structure for NiCo 2 O 4 /NiMoO 4 . In this work, NiCo 2 O 4 /NiMoO 4 electrodes were prepared under optimal conditions of primary hydrothermal time of 12 h, annealing temperature of 350 °C, and secondary hydrothermal time of 8 h. The optimized hierarchical NiCo 2 O 4 /NiMoO 4 electrode exhibits a high areal capacitance of 3.85 F·cm −2 (at a current density of 4 mA·cm −2 ) and better cycle stability than the NiCo 2 O 4 and NiMoO 4 electrode, respectively. The constructed asymmetric supercapacitor NiCo 2 O 4 /NiMoO 4 //AC has a satisfactory energy density of 38.69 Wh·kg −1 at 228.56 W·kg −1 power density. At the current density of 4 mA·cm −2 , ASC devices still have a capacity retention rate of 90.88% after 5000 cycles, indicating their potential application in energy storage devices.