Laser-modified nanocrystalline NiMoO4 as an electrode material in hybrid supercapacitors

O.M. Popovych; I.M. Budzulyak; M.M. Khemii; R.V. Ilnytskyi; L.S. Yablon; D.I. Popovych; I.I. Panko

doi:10.15330/pcss.24.1.190-196

Authors

O.M. Popovych Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
I.M. Budzulyak Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
M.M. Khemii Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
R.V. Ilnytskyi Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
L.S. Yablon Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
D.I. Popovych Ya. S. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, Lviv, Ukraine
I.I. Panko Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.24.1.190-196

Keywords:

hybrid supercapacitor, laser irradiation, nickel molybdate, electrical conductivity, specific capacitance

Abstract

The nanocrystalline NiMoO₄ obtained as a result of hydrothermal synthesis was exposed to laser radiation with a pulse energy of 70 mJ/cm² for 5 minutes. The phase composition and size of crystallites of the triclinic structure of NiMoO₄ were determined by X-ray analysis. The average crystallite size was 18 nm for laser-irradiated nickel molybdate. Impedance analysis was used to analyze the temperature dependence of the electrical conductivity of laser-modified NiMoO₄. The frequency index of the power law, determined by the nonlinear approximation method, was 0.5-0.67, which corresponds to the hopping mechanism of charge carriers. The electrochemical behavior of NiMoO₄ was studied using cyclic voltammetry and galvanostatic charge/discharge testing. The laser-irradiated NiMoO₄ reaches a specific capacitance of 553 F/g at a scan rate of 1 mV/s. The hybrid electrochemical system based on electrodes of modified NiMoO₄ and carbon material provides high Coulombic efficiency (95%) for a significant number of charge/discharge cycles.

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