Mo-doped ZnO nanoflakes on Ni-foam for asymmetric supercapacitor applications

Abstract

A single-step hydrothermal route for synthesizing molybdenum doped zinc oxide nanoflakes was employed to accomplish superior electrochemical characteristics, such as a specific capacitance of 2296 F g⁻¹ at current density of 1 A g⁻¹ and negligible loss in specific capacitance of 0.01025 F g⁻¹ after each charge–discharge cycle (up to 8000 cycles). An assembled asymmetric supercapacitor (Mo:ZnO@NF//AC@NF) also exhibited a maximum energy density and power density of 39.06 W h/kg and 7425 W kg⁻¹, respectively. Furthermore, it demonstrated a specific capacitance of 123 F g⁻¹ at 1 A g⁻¹ and retained about 75.6% of its initial capacitance after 8000 cycles. These superior electrochemical characteristics indicate the potential of this supercapacitor for next-generation energy storage devices.