Synthesis and Electrochemical Properties of Nanocrystalline Nickel Molybdate

O.M. Popovych; I.M. Budzulyak; O.V. Popovych; B.I. Rachiy; R.V. Ilnytskyi; L.S. Yablon; O.V. Morushko

doi:10.15330/pcss.22.1.123-131

Authors

O.M. Popovych Vasyl Stefanyk Precarpathian National University
I.M. Budzulyak Vasyl Stefanyk Precarpathian National University
O.V. Popovych Vasyl Stefanyk Precarpathian National University
B.I. Rachiy Vasyl Stefanyk Precarpathian National University
R.V. Ilnytskyi Vasyl Stefanyk Precarpathian National University
L.S. Yablon Vasyl Stefanyk Precarpathian National University
O.V. Morushko Vasyl Stefanyk Precarpathian National University

DOI:

https://doi.org/10.15330/pcss.22.1.123-131

Keywords:

nickel molybdate, hydrate, cyclic voltammogram, specific capacitance, сoulombic efficiency, activated carbon, hybrid supercapacitor

Abstract

We have obtained nanocrystalline hydrate and alpha phase of nickel molybdate by a hydrothermal technique. On the basis of the obtained cyclic voltammetry data, we have evaluated the contribution of faradaic and non-faradaic processes to the total capacitance of molybdates under study. It was found that the specific capacitance of hydrate NiMoO₄·H₂O is 621 F/g at a scan rate of 1 mV / s and the specific capacitance of the α-NiMoO₄ is 281 F/g. Cathodes for hybrid supercapacitors were formed on the basis of the obtained nickel molybdates. As a result of electrochemical studies, it was found that the specific capacitance of hybrid supercapacitor based on NiMoO₄·H₂O/C was 256 F/g at the current of 0.2 A/g, while the specific energy was 80 W h/kg and specific power – 304 W/kg and these results are higher below in the α-NiMoO₄/C-based hybrid supercapacitor.

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