Synthesized sea urchin morphology of copper incorporated hollandite manganese dioxide for energy storage applications

As a potential clarification of the burgeoning global need for impactful energy storage, supercapacitors have shown a great deal of promise. Transition metal oxides play an important role in a environmental socia-bility, and abundance. Various weight percentages (2%, 4%, and 6%) of copper-incorporated Manganese dioxide (Cu-doped alpha-MnO2) are prepared by a hydrothermal method that resembles the sea urchin struc-ture to augment the electrochemical performance for energy storage applications. The samples are char-acterized for their structure, morphology, and elemental composition by various analytical tools. The super-capacitive nature of the materials is further investigated as electrodes for an asymmetric hybrid capacitor with 6 M KOH. Among them, the 2% Cu-doped a-MnO2 exhibits the best electrocapacitive output by virtue of its low resistance along with large surface area. This electrode achieves a specific capacitance (258.99 F/g) at 1 A/g with a maximum energy density (35.97 W kg(-1)) and power density (357.13 W h/kg). (c) 2023 Elsevier B.V. All rights reserved.