Registration Number
0221U106582,
0121U111831
, R & D reports
Title
Engineering of media based on oxide nanomaterials for electrical energy storage systems
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Head
Shylo Artem V., Кандидат фізико-математичних наук
Registration Date
14-12-2021
Organization
Galkin Donetsk Institute of Physics and Technology of the National Academy of Sciences of Ukraine
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Aim of the work - defining the relationship between the surface structure of nanoparticles of zirconia, the configuration of the adsorbed water layers on their surface and the electrophysical properties of compacted nanoparticles.
Objects of research - ZrO2+3%Y2O3 oxide nanopowders with different annealing temperature (400-1000oС).
Research methods - X-ray, BET, TEM and SEM, pH–metry, DSC, electrochemical impedance spectroscopy (EIS); distribution of relaxation time analysis.
The result of the study - optimization of characteristics of ZrO2 + 3% Y2O3 nanopowders to obtain media for electric energy storage devices was carried out. The X-ray shows that the increase in the synthesis temperature of nanopowders does not affect the phase composition, but has effect on increasing the size of CSA and reducing the specific surface area (BET method) of nanopowders. The DSC shows that hydrate layer of nanoparticles is represented by physically adsorbed water molecules with different degree of connection with nanoparticle surface. The pH-metry shown that synthesis of nanoparticles at temperatures below 500oC leads to formation of acidic centers on surface of particles, orientation of adsorbed water molecules to surface of nanoparticles is oxygen, while for nanopowders with synthesis temperatures above 500oC predominant nature of surface centers is base, water molecules are oriented by hydrogen to surface of nanoparticle. The EIS shows that the active resistance of elements associated with the hydrate shell of the nanoparticle increases and the reactive resistance is decreases with increasing synthesis temperature of nanoparticles.
As a result, a physical model of structure formation in the system "zirconia nanoparticle - adsorbed water layer" depending on the size and condition of the surface of nanoparticles as a function of synthesis temperature and the correlation between electrical properties of compacted zirconia nanoparticles and their adsorption properties are shown.
Product Description
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Kredentser Serhii V.
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2021-12-14
