One-pot synthesis of morinda pubescens fruit-like structure of Bi@BiVO4 by a simple hydrothermal route: High performance and long-term stability for supercapacitor applications

Abstract

To meet societal and environmental needs in the future, it is vitally necessary to develop more efficient electricity storage. The need for more effective, efficient energy storage has reignited scientific and commercial interest in enhanced capacitor designs, where the collection of experimental methods and theories that make up nanotechnology play a crucial role. Morinda pubescens fruit (MPF)-like structures Bi@BiVO4 were synthesized using a simple hydrothermal approach, which manifested in highly efficient, stable pseudo-capacitance applications. MPF-like structure Bi@BiVO4 was found to form in the monoclinic scheelite phases in the prepared samples, as determined by the XRD analysis. Using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge-discharge (GCD) systems, the pseudo-capacitance behaviour of working electrodes covered with a highly crystalline MPF-like structure, Bi@BiVO4, was investigated. The maximum specific capacitance, 1105 F/g in 1 A/g at 2 M KOH, was attained by a modified electrode utilizing the MPF-like structure Bi@BiVO4. The MPF-like structure of Bi@BiVO4 coated on a Ni foam electrode was shown to be significantly more stable for 10,000 cycles at 1 A/g than the stability of previously fabricated electrode materials. With great capacitance retention and columbic efficiency of 100.8 % and 89 % at 1 A/g, this redesigned supercapacitor performs well. The assembled asymmetric supercapacitor of Bi@BiVO4@NF//AC@NF has a good capacitance retention value of 98 % and the energy density and power density of Bi@BiVO4@NF//AC@NF are 39.7 Wh k/g and 3205 W k/g, respectively. This gadget is inexpensive and very effective. It is a viable contender and a suitable alternative material for supercapacitor applications.