The Physico-Chemical nanomaterials science

Synthesis, structure and electrochemical properties of perovskite LaMnO3 
Kolkovska H.M., Yaremiy I.P., Kolkovskyi P.I., Rachiy B.I.,
The Department of Material Science and New Technology, Vasyl Stefanyk Precarpathian National University.
57 Shevchenko Str., Ivano-Frankivsk-76018, Ukraine. 
E-mail: Pavlokolkovskyy@gmail.com

Nowadays the electrochemical capacitors are one of the most optimal electrical energy storage devices. One of the most common materials are materials with a perovskite structure. The most promising materials of this type is LaMnO3, which is ecological and economic accessibility and rather high electrochemical parameters. Moreover, include the oxygen vacancies and fast ionic diffusion, these materials are used as electrode material in energy storage devices [1].
Thus, we report on the synthesis of a complex oxide LaMnO3, which was obtained by the sol-gel method with the participation of auto-burner [2]. The obtaining material has a perovskite structure of the space group Pm-3m with a lattice parameter of 3.945 Å. The specific surface area of the obtained material is 42 m2/g. The morphology of the synthesized LaMnO3 is formed by particles with a size of 40-60 nm, between which cavities from 5 to 12 nm are formed. The results obtained indicate that the mesoporous structure of the LaMnO3 material is favorable for the diffusion of electrolyte ions.
The electrochemical behavior of the LaMnO3/electrolyte (6M KOH) system was investigated by voltammetry and by a galvanostatic method.
The specific capacity of the LaMnO3 material, determined from the potentiodynamic method, is 40 F/g at a scan rate of 1 mV/s. The data obtained were confirmed by the chronopotentiometric method. Thus, the material under research LaMnO3 is a suitable material for use as an electrode material for electrochemical capacitors.

1.	Mokhnatskyi M.L., Yaremiy I.P., Kolkovskyi P.I., Mokhnatska L.V., Yaremiy S.I., Kachmar A.I., Cherkach K.P. Promising Cathode Material for Supercapacitors LaFe0.5Cr0.5O3 Perovskite Nanoparticles // Physics and Chemistry of Solid State.- 2020.- 21(4).- P.635-639.
2.	Ostafiychuk B.K., Kolkovska H.M., Yaremiy I.P., Rachiy B.I., Kolkovskyi P.I., Ivanichok N.Y., Yaremiy S.I. Synthesis and Electrochemical Properties of LaMnO3 Perovskite Nanoparticles // Physics and Chemistry of Solid State.- 2020.- 21 (2).- P.219-226.