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Journal of Electrochemical Science and Engineering, Vol. 13 No. 5, 2023.

Original scientific paper

https://doi.org/10.5599/jese.1595

Vanadium oxide - poly(3,4-ethylenedioxythiophene) cathodes for zinc-ion batteries: effect of synthesis temperature

Filipp S. Volkov ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation
Svetlana N. Eliseeva ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation
Mikhail A. Kamenskii ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation
Alexey I. Volkov ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation
Elena G. Tolstopjatova ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation
Veniamin V. Kondratiev ; Department of Electrochemistry, Institute of Chemistry, St. Petersburg State UniversityUniversitetskaya nab. 7/9, St. Petersburg, 198504, Russian Federation

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Abstract

Vanadium oxide composites with conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) were obtained by one-step microwave-assisted hydrothermal synthesis at two different temperatures: 120 and 170 °C (denoted as V-120 and V-170, respectively). The structure and composition of the obtained samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, X-ray photoelectron spectro­scopy (XPS), and thermogravimetric (TG) analysis. The detailed study of the electro­chemical properties of the composites as cathodes of aqueous zinc-ion battery was per­formed cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) at different current densities and by electrochemical impedance spectroscopy (EIS). It was shown that V-120 demonstrated excellent electrochemical performance in the 0.3 to 1.4 V vs. Zn/Zn2+ potential range reaching specific capacities up to 390 mA∙h∙g−1 at 0.3 A∙g−1 with excel­lent capacity stability after 1000 charge-discharge cycles. Its functional parameters were found to be much better than those of the electrodes based on the V-170 composite obtained at a higher temperature. The effect of the synthesis temperature on the electro­chemical properties is discussed in terms of the crystallographic, compositional, and thermogravimetric properties of the samples.

Keywords

Aqueous zinc-ion battery; hydrothermal synthesis; temperature of synthesis; electro-chemical performance; structure

Hrčak ID:

307193

URI

https://hrcak.srce.hr/307193

Publication date:

11.8.2023.

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