from 01.01.2022 until now
Saratov, Saratov, Russian Federation
employee from 01.01.2000 until now
Saratov, Saratov, Russian Federation
graduate student from 01.01.2022 until now
Yuri Gagarin State Technical University of Saratov (Chemistry and Chemical Technology of Materials, PhD student)
from 01.01.2022 until now
Saratov, Saratov, Russian Federation
employee from 01.01.1976 to 01.01.2025
Saratov, Saratov, Russian Federation
The formation of electrochemically active coatings based on various titanates on the surface of titanium-metallized carbon fabrics was studied using sequential chemical treatment in concentrated aqueous solutions of acid, alkali, and manganese sulfate, as well as additional heat treatment of the resulting coatings in an argon atmosphere. The composition and structure of the coatings obtained were studied at various stages of thermochemical treatment. It was shown that the optimal chemical treatment regime for titanium-metallized carbon fabrics included a use of HCl (1 M, 3 min), KOH (6 M, 5 min), and MnSO4 (0.02 M, 30 min) solutions. With increasing treatment time in acid and alkali solutions, partial or complete dissolution of the metal coating occurred. It was found that, as a result of firing in an inert atmosphere (Ar), amorphous films obtained after preliminary chemical treatment of the titanium coating acquired a homogeneous crystalline structure of the hollandite-like solid solution KxMnyTi8-yO16 with an admixture of potassium hexatitanate (K2Ti6O13). A ceramic coating with a homogeneous structure could be obtained as a result of heat treatment at 950 °C/0,5h. Impedance spectroscopy was applied to study the electrical properties of the obtained hybrid electrode materials in the composition of prototype supercapacitor samples with a 5% KCl aqueous solution used as an electrolyte. It was shown that the impedance spectra of the studied model supercapacitor cells, in the frequency range from 30 Hz to 3 MHz, exhibited behavior characteristic of ion-conducting materials with a pronounced non-ideality of the capacitive response. Using an equivalent circuit proposed for interpreting the results obtained from the studied electrochemical systems, it was demonstrated that diffusion charge transfer processes play a significant role in hybrid electrode materials obtained as a result of chemical and thermal treatment. Cyclic voltammetry demonstrated that the formation of an electrochemically active coating increased the potential window of the supercapacitor prototypes from 1,5 to 2 V. The specific energy capacity of the capacitor cell increased from 12.9 to 16.7 mA∙h/g at a scanning rate of 10 mV/s.
HYBRID ELECTRODE MATERIALS, CARBON FABRICS, COATINGS, THERMO-CHEMICAL MODIFICATION, ELECTRICAL PROPERTIES
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