Abstract
The aim of this paper is to establish the optimal content of carbon material in composites with nanocrystal hydrate nickel molybdate. To achieve this, NiMoO4 / C composites with a carbon material content of 1, 5 and 10% by weight (with and without ultrasonic irradiation) were obtained by hydrothermal method. As a result of electrochemical studies, it was found that the maximum specific capacitance of 628 F/g is reached by a composite with a carbon content of 1% after ultrasonic exposure, while this composite shows excellent electrical conductivity, which is 0.47 Ohm-1m-1.
Highlights
Mixed oxides of transition metals such as metal molybdates MMoO4 (M - Ni, Co, Mn) due to their multiple valence states and high electrical conductivity are considered the best materials for electrodes of electrical energy storage devices compared to single oxides of transition metals [1]
Cobalt and manganese molybdates are widely used in hybrid capacitors [2] they have a number of disadvantages, which limits their ability to achieve theoretical capacitance
One way to solve this problem is to form composites based on binary oxides of molybdates with carbon material, which allows us to increase the electrical conductivity of the material and the number of active centers for ion adsorption [3]
Summary
Mixed oxides of transition metals such as metal molybdates MMoO4 (M - Ni, Co, Mn) due to their multiple valence states and high electrical conductivity are considered the best materials for electrodes of electrical energy storage devices compared to single oxides of transition metals [1]. One way to solve this problem is to form composites based on binary oxides of molybdates with carbon material, which allows us to increase the electrical conductivity of the material and the number of active centers for ion adsorption [3]. Another effective way to improve the specific energy characteristics of materials for the electrodes of hybrid capacitors is ultrasonic modification. NiMoO4 is an inexpensive, chemically stable and environmentally friendly material with good electron transport characteristics (electrical conductivity varies in the range from 10-13 to 10-6 S/m) combined with the electrochemical activity of nickel ions [5]
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