Strategic Enhancement of a Neodymium-based Metal Organic Framework with SWCNTs and MXene for Hybrid Energy Storage Devices

Abstract

Hybrid supercapacitors (HSCs), with high energy density and power density, accompanied by extended life cyclability, have come forward as ultimate energy storage devices. Owing to their high redox activity, huge surface area, porous topological framework, and versatile high redoxactivity, open topological structure, and configurable morphology, metal-organic frameworks (MOFs) have substantial interest as materials for electrodes. However, they suffer from considerable problems due to their poor electrical conductivity and inadequate stability. Herein, Nd-PDAMOF, Nd-PDA@MXene, and Nd-PDA@SWCNT composites were developed, and their applicability as electrode materials was analyzed through electrochemical characterization.The electrochemical analysis displayed that the Nd-PDA@SWCNT composite exhibited superior electrochemical performance with an outstanding specific capacity of 260.91 C g -1 and specific capacitance of 521.82 Fg -1 at a current density of 1 Ag -1 . Nd-PDA@SWCNT composite was fabricated against activated carbon (AC) to design HSC, which demonstrated a specific capacity of 104.24 Cg -1 and a specific capacitance of 69.49 Fg -1 at 0.5 Ag -1. Maximum energy density of 21.71 Whkg -1 and a power density of 1151 Wkg -1 with 99% Coulombic efficiency even after 10,000 charging-discharging cycles were determined. Dunn's method was employed to extract capacitive and diffusive contributions. The findings propose that the Nd-PDA@SWCNT composites an outstanding candidate for electrode materials in hybrid energy storage devices.