Electrochemical performance of MnMoO4-decorated MWCNT nanocomposite plates for asymmetric capacitor applications

Abstract

To improve advanced energy storage systems, innovative and versatile electrode materials with exceptional electrochemical characteristics must be developed. In this study, we present a new and distinctive design for an electrode made of MWCNT nanowires decorated on plates like MnMoO₄. The nanocomposite was fabricated using a hydrothermal method and developed for use in an asymmetric supercapacitor. Initially, the samples underwent thorough examination using spectroscopic techniques such as XRD and XPS, as well as microscopic investigation using FE-SEM. The sample provides an effective mesoporous structure, facilitates the flow of ions, enables fast electron transfer, and permits a higher concentration of MnMoO₄ and MWCNT active sites. The MnMoO₄/MWCNT composite has a specific capacitance (C_s) of 1800 F/g at 1 A g⁻¹, demonstrating excellent durability in a three-electrode cell. The built asymmetric supercapacitors demonstrate a power density of 1062 W kg⁻¹ and an energy density of 42.48 Wh kg⁻¹. Furthermore, the ASCs exhibit remarkable cycling stability, with about 93% capacity retention after undergoing 10,000 cycles. Therefore, the current work clearly shows its effective due to its excellent electrochemical properties, this material shows great potential to be used in storage systems for energy.