Preparation of a Ga-doped MnMoO4 porous flower-like structure and study on its supercapacitor performance

Abstract

In this study, Ga-doped MnMoO₄ self-supported flower-like structured electrode materials were successfully prepared by the sol–gel method. The research results show that the introduction of gallium not only enhances the conductivity and charge transfer rate of MnMoO₄, but also improves the electrolyte permeability and ionic transport capacity by introducing oxygen vacancies and lattice defects. In addition, the self-supported flower-like structure increases the specific surface area of the material, enhances the structural stability of the material, provides more transport channels for ions, and improves the electrochemical reaction rate and cycling stability of the material. In the three-electrode test system, the specific capacitance of Ga-doped flower-like MnMoO₄ decreased from 1376 F g⁻¹ to 1358 F g⁻¹ after 10 000 cycles at a high current density of 15 A g⁻¹, with a retention rate of 98.6%. This fully demonstrates that this material has excellent stability in terms of cycle life. It exhibits outstanding cycle life. Moreover, after the performance of the carbon nanotube (CNT) material is enhanced, its excellent conductivity and ionic diffusion properties provide strong support for efficient energy storage. The Ga-doped flower-like MnMoO₄//CNT device, after 10 000 cycles at 5 A g⁻¹, saw a decrease in specific capacitance from the initial 255 F g⁻¹ to 249 F g⁻¹, with a capacitance retention rate of 97.6%, providing an effective strategy for the design and development of high-performance supercapacitors.