Ordered mesoporous carbon/molybdenum carbide nanocomposite with high electrochemical performance asymmetric supercapacitor.

• Ordered mesoporous carbon/Molybdenum carbide nanocomposite was prepared via a hydrothermal reaction with a hard template. • The OMC/Mo 2 C nanocomposite shows excellent electrochemical properties due to the synergistic effect between Mo 2 C and OMC. • The OMC/Mo 2 C nanocomposite exhibits a specific capacitance of 1718 F g−1 at 1 A g-1 current density. • The OMC/Mo 2 C nanocomposite based asymmetric supercapacitors manner high energy and power densities. [Display omitted] Supercapacitors are a different promising technique to satisfy the rising demand for energy storage systems. Introducing an economical and highly active electrocatalysts is crucial to exploit clean and environmental-friendly energy technology in the future. We have successfully manufactured a supercapacitor based on ordered mesoporous carbon/ molybdenum carbide (OMC/Mo 2 C) nanocomposite. OMC has been chosen as a substrate due to its conductivity, favorable physical strength, high flexibility, and light structure. The OMC/Mo 2 C nanocomposite electrode performed exceptionally well from electrochemical perspective, with a high capacity of 1718 F g−1 at 1 A g−1 current density. It was seen that the capacitance retention rate could still reach 90.3% after 5000 cycles, indicating that the OMC/Mo 2 C nanocomposite electrode has excellent stability. Moreover, the assembled OMC/Mo 2 C//AC asymmetric supercapacitor exhibits capacitance of 299.4 F g−1 at a current density of 1 A g−1, and a large energy density of 106.4 Wh kg−1 at a power density of 800 W kg−1, by exceptional cycling stability with 90% capacity maintenance after 5000 cycles. The research findings can be applied in the development of high-performance energy storage devices based on carbides of transition metals. [ABSTRACT FROM AUTHOR]