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Characterization of boron-doped diamond electrodes by electrochemical impedance spectroscopy

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Abstract

Charge transfer on boron doped diamond (BDD) electrodes was studied by cyclic voltammetry and electrochemical impedance spectroscopy. The diamond films of 5 μm thickness and boron content between 200 ppm and 3000 ppm were prepared by the hot filament CVD technique on niobium substrate and mounted in a Teflon holder as rotating disk electrodes. The electrochemical measurements were carried out in aqueous electrolyte solutions of 0.5 M Na2 SO 4 + 5 mM K3[Fe(CN)6]/K4[Fe(CN)6]. Significant deviation in the redox behaviour of BDD and active Pt electrodes was indicated by a shift of the peak potentials in the cyclic voltammograms with increasing sweep rate and lower limiting diffusion current densities under rotating disk conditions. In the impedance spectra an additional capacitive element appeared at high frequencies. The potential and rotation dependence of the impedance spectra can be described quantitatively in terms of a model based on diffusion controlled charge transfer on partially blocked electrode surfaces. Direct evidence for the non-homogeneous current distribution on the diamond surface was obtained by SECM measurements.

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Acknowledgements

The authors acknowledge financial support of this work by the Deutsche Forschungsgemeinschaft, DFG (JU 201–8). We also thank the Fraunhofer Institut für Schicht und Oberflächentechnik, IST Braunschweig, Germany, for providing the boron doped diamond films on niobium substrate. The authors are indebted to Dr. K. Bauer-Espindola, HEKA Elektronik, for the SECM measurements on BDD.

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Jüttner, K., Becker, D. Characterization of boron-doped diamond electrodes by electrochemical impedance spectroscopy. J Appl Electrochem 37, 27–32 (2007). https://doi.org/10.1007/s10800-006-9228-6

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  • DOI: https://doi.org/10.1007/s10800-006-9228-6

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