Electrochemical properties of diamond-like carbon electrodes prepared by the pulsed laser deposition method |
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Authors: | Gunnar?Nurk Jaanus?Eskusson Raivo?Jaaniso Email author" target="_blank">Enn?LustEmail author |
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Institution: | (1) Institute of Physical Chemistry, University of Tartu, 2 Jakobi Street, 51014 Tartu, Estonia,;(2) Institute of Physics, Estonian Academy of Sciences, 142 Riia Street, 51014 Tartu Estonia, |
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Abstract: | Diamond-like carbon electrodes (DLCEs) have been synthesized by the pulsed laser deposition method. The surface structure
of the DLCEs has been studied by atomic force microscopy and the root-mean-square roughness has been established as R
ms≥81 ?. Electrochemical impedance spectroscopy and cyclic voltammetry data show that DLCEs are nearly ideally polarizable in
the potential region –0.4<E<1.1 V (vs. Ag|AgCl|sat. KCl in H2O) in 0.1 M NaF+H2O solution. Various equivalent circuits have been used for fitting the complex plane and Bode plots. A very good agreement
between experimental and calculated Nyquist curves has been established if the charge transfer and double layer charging at
the surface, intercalation of the H+ and (or) Na+ ions and solid phase diffusion inside the nanoparticle, as well as the effect of an insulating film at the surface (i.e.
surrounding the nanoparticles), are taken into account. |
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Keywords: | Diamond-like carbon Electrochemical double layer Impedance Pulsed laser deposition |
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