Electrochemical Behavior of Tungsten-containing
Nanocomposite with Siloxane Matrix¹

M. D. Krotova^a, Yu. V. Pleskov^{z ,a}, V. V. Elkin^a, A. D. Bozhko^b, and M. L. Shupegin^c

^a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

^b Prokhorov General Physics Institute, ul. Vavilova 38, Moscow, 119991 Russia

^c Moscow Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936 Russia

Received February 22, 2008

Abstract—Electrochemical properties of a thin-film nanocomposite “silicon–carbon matrix–tungsten carbide”
deposited onto pyroceramics (“sitall”) substrate are studied by potentiodynamic curves and electrochemical
impedance spectroscopy. Transfer coefficients in model redox system [Fe(CN)₆]^3/4 are measured. With the
decreasing of the films' electrical resistance, their experiment behavior gradually changed from that of “poor
conductor” till nearly metal-like one. In particular, the electrode differential capacitance increases, which is
explained by the increase in the number of conducting metal-containing clusters in the film bulk and at the
film/electrolyte solution interface. Some specific features of the complex-plane plots of impedance spectra are
tentatively explained by the adsorption at the nanocomposite surface elements.

Key words: nanocomposite, thin film, tungsten, tungsten carbide, electrode, potentiodynamic curve, differential
capacitance

DOI: 10.1134/S1023193509010133

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