Abstract

This study reports the fabrication and comprehensive physicochemical characterization of Cu3(MoO4)2(OH)2 nanostructures for use in supercapacitor applications. A simple hydrothermal technique was used to create the nanostructures, which enables controlled morphology and high crystallinity. Structural properties were confirmed through X-ray diffraction, revealing a pure monoclinic phase. Morphological analysis using scanning and transmission electron microscopy showed well-defined diamond and rhombus-like architectures with uniform size distribution. Fourier transform infrared and Raman spectroscopy analyses confirmed the characteristic bonding and functional groups. Supercapacitors have garnered considerable interest owing to their rapid charge-discharge capabilities, outstanding rate performance, and durability over time. In this study, copper molybdate (Cu3(MoO4)2(OH)2) was synthesized by a single-pot hydrothermal method as a electrode material for super-capacitors. The electrochemical performance was evaluated in a 2 M KOH electrolyte, demonstrating a high specific capacitance of 574 F g-1, excellent cyclic stability up to 5000 cycles, and superior rate performance. The Cu3(MoO4)2(OH)2//AC/Ni-foam asymmetric device delivered promising energy and power densities, with impressive stability over 5000 cycles. At the current density of 1 A g-1, the device delivered an energy density of 64.7 Wh kg-1 and power density of 749.8 W kg-1, and a specific capacitance of 143 F g-1. Additionally, the presence of hydroxide groups in Cu3(MoO4)2(OH)2 contributes to enhanced conductivity and structural stability, further improving the electrochemical behavior. These results highlight the potential of Cu3(MoO4)2(OH)2 as a promising material for high-performance supercapacitors, offering a combination of high capacitance, long-term durability, and fast charge-discharge behavior.