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.
Highlights
To ful l the increasing electrical energy demand of daily life, the development of extremely economical and efficient energy storage devices is desperately required
Various kinds of electrical double-layer capacitor (EDLC) materials have been employed as SCs electrodes such as graphene, carbon nanotubes (CNTs), carbide-derived carbons, zeolite-templated carbon, carbon-nano bers and activated carbon.[5,6,7]
This study presents a facile KOH-produced hydrothermal method followed by short duration thermal calcination for the synthesis of molybdenumdoped zinc oxide (Mo:ZnO) nano akes on nickel (Ni)-foam
Summary
The pseudocapacitors operating by the Faraday process possess much more speci c capacitance as compared to EDLCs.[9,10] Over the past few years, transition metal oxides have been signi cantly engaged as supercapacitor electrode materials. For supercapacitor applications, working principle of transition metal oxides is mainly based on the rapid faradaic redox reactions.[11,12,13,14,15,16] One of the extensively investigated transition metal oxides, zinc oxide (ZnO) is well-recognized active material with high energy density. Doped zinc oxide might be anticipated to have a promising prospect.[19,20] The purpose of this investigation is to improve the electrochemical properties of ZnO-based metal oxides by incorporating high-capacity molybdenum. Over the synergistic contribution from each transition metal, the Mo:ZnO nano akes demonstrated wide potential window, high speci c capacitance, and long-term cycling performance. Asymmetric supercapacitor based on Mo:ZnO and activated carbon on Ni-foam (AC@NF) showed a superior energy density, excellent cycling stability, and high speci c capacitance
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