Electrochemical Behavior of New Electrode Material:
Compact of Boron-doped Synthetic Diamond

Yu. V. Pleskov^a,z, M. D. Krotova^a, V. V. Elkin^a, and E. A. Ekimov^b

^aFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia

^bInstitute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, 142190 Russia

Received December 25, 2014

Abstract—Electrochemical properties of new electrode material—compact of boron-doped synthetic dia-
mond—is studied for the first time. Cylindrical samples 3.5–4 mm in diameter and 2.5 mm in height were
obtained by thermobaric processing of graphite–boron carbide mixtures in the diamond thermodynamic stabil-
ity region (at the pressure of 8–9 GPa and temperature of ~2500 K). Their electrode behavior is studied using
cyclic voltammetry and electrochemical impedance spectroscopy techniques. The cyclic voltammograms of the
compact samples showed that their electrode characteristics are similar to those of traditional thin-film diamond
electrodes obtained by the chemical vapor deposition (CVD) technique. In particular, they demonstrate rather
wide potential window, low background current in indifferent electrolytes, and good reproducibility. It can be
concluded that the diamond compacts practically are not inferior to the thin-film CVD-diamond electrodes and
can serve as indicator electrodes, e.g., in electroanalysis. At the same time their compact form may be a conve-
nience in the designing of electrolyzers and other electrochemical devices.

Keywords: diamond, compact, boron carbide, polycrystalline, cyclic voltammetry, electrochemical impedance
spectroscopy

DOI: 10.1134/S1023193516010079

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