Self-assembled CoMoO4/3D worm-like expanded graphite composites for high performance supercapacitors

In this paper, a worm-like CoMoO₄/expanded graphite (EG) composites materials prepared by hydrothermal method is presented. The composite material combines the high capacitance properties of the bimetallic oxide CoMoO₄ with the excellent electrical conductivity and high specific surface area of EG, realizing a significant enhancement of electrochemical properties. The results show that the specific capacitance of the CoMoO₄/EG composite is 1359 F/g at 1 A/g current density, which is far more than that of the pure CoMoO 4 (549 F/g) and EG (422 F/g). The improvement of the capacitive performance is mainly attributed to the conductive network constructed by EG to effectively accelerate the electron transport. Moreover, its high specific surface area provides abundant electrochemical reaction sites, forming a strong synergistic effect with CoMoO 4 . Further, the asymmetric supercapacitor based on this composite material achieved a high energy density of 69.96 Wh/kg at a power density of 750 W/kg, highlighting its excellent energy storage performance. This study opens up a new way for the design of capacitor electrode materials and further verifies the great advantages of the composite strategy of bimetallic oxides and carbon-based materials in enhancing the electrochemical performance. It is significant to promote the development and application of high-performance capacitors.