Zhang W, Ristein J, Ley L (2008)
Publication Type: Journal article
Publication year: 2008
Publisher: American Physical Society
Book Volume: 78
Pages Range: 041603
DOI: 10.1103/PhysRevE.78.041603
One of the most attractive features of diamond is its robust p -type surface conductivity that develops spontaneously under atmospheric conditions on hydrogen-terminated samples. An electrochemical charge transfer between diamond and an air-borne redox couple has been suggested to be responsible for the spontaneous appearance of surface-near holes. We present direct proof for the redox activity of the diamond surface by measuring pH -dependent open circuit potentials and quasistatic polarization curves for hydrogen-terminated and partially oxidized diamond electrodes. Under open circuit conditions we find in fact a mixed (or corrosion) potential that is consistent with the simultaneous equilibriation of the electrode versus both the hydrogen-hydronium and the oxygen-hydroxyl redox couple. Our data show extremely long-time constants for establishing the redox equilibrium and very low exchange current densities making the identification and characterization of the redox process a demanding experimental task. © 2008 The American Physical Society.
APA:
Zhang, W., Ristein, J., & Ley, L. (2008). Hydrogen-terminated diamond electrodes: II. Redox activity. Physical Review E, 78, 041603. https://dx.doi.org/10.1103/PhysRevE.78.041603
MLA:
Zhang, Wenying, Jürgen Ristein, and Lothar Ley. "Hydrogen-terminated diamond electrodes: II. Redox activity." Physical Review E 78 (2008): 041603.
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