Electrochemical Behavior of Nanocrystalline NiMoO₄ Hydrate Modified by Ultrasound

Abstract:

To improve the specific capacitance, power and energy of electrical energy storage devices, in particular hybrid capacitors, various methods of cathode material modification are used. One of the methods of modifying nanostructured materials without applying high temperatures, pressures and long reaction times is ultrasonic treatment. Although the interaction of ultrasound with the structure and surface of electrode materials is well enough studied, there are few works that investigate the optimal duration of ultrasonic treatment and its relationship with the capacitive characteristics of these materials. Therefore, we investigated the efficiency of ultrasonic dispersion of nanocrystalline nickel molybdate hydrate for 15, 60 and 90 minutes. The appearance of two cathodic peaks on cyclic voltammetry patterns was analyzed and the charge / discharge mechanism of the electrode based on nanocrystalline NiMoO₄ hydrate was presented. Based on the results of potentiodynamic and galvanostatic studies the specific capacitances of the initial NiMoO₄ and the material modified by ultrasound for 15, 60 and 90 minutes were calculated. The proton diffusion coefficients of nickel molybdate hydrate were determined on the basis of the Randles–Sevcik equation. NiMoO₄ subjected to ultrasonic dispersion for 60 min as a cathode material in a hybrid electrochemical system was tested.

• Periodical: Journal of Nano Research (Volume 77)
• Pages: 145-154
• DOI: https://doi.org/10.4028/p-n9054o
• Online since: March 2023
• Authors: Olha Popovych*, Ivan Budzulyak, Mariia Khemii, Roman Ilnytskyi, Lyubov Yablon
• Keywords: Diffusion Coefficient, Hybrid Capacitor, Nickel Molybdate Hydrate, Specific Capacitance, Ultrasonic Treatment

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