Conductive diamond electrodes (boron-doped diamond, BDD) have received great interest because of their wide range of ideal polarizability and high chemical inertness. The first property has suggested their application both for fundamental studies ([1-4] and references therein) and in the field of electroanalysis [5], while the second feature has allowed the electrosynthesis of powerful oxidants [6-8] as well as the use of BDD anodes for wastewater treatment [9,10]. In spite of the diamond stability, a strong chemical or electrochemical oxidation of the initially hydrophobic surface leads to the production of oxygenated groups, which are responsible for the hydrophilic character of the oxidized diamond surface. Once the modification has been obtained, its stability is so high that the pristine electrode surface can be recovered only by hydrogen-plasma treatment; moreover also the electrochemical properties of BDD are significantly modified and possibly useful characteristics become available. Results on both the thermal and the chemical oxidation of diamond specimens have appeared in the literature; as a consequence of the latter oxidation, different oxygenated species are formed on the sample surface, while the thermal treatment seems to cause a preliminary change in crystal morphology, followed by a chemical modification. Notwithstanding the above exposed interest on BDD, only a limited information is available concerning the effect of anodic polarizations on the chemical and electrochemical properties of these electrodes. Accordingly, the present work was based on electrochemical analysis and X-ray Photoelectron Spectroscopy surface characterization of different BDD specimens. In particular, a detailed description of both the nature and the relative abundance of the dominant chemical species have been performed. Discussion and results have been mainly focused on the correlation between the observed quantitative and qualitative changes of the surface composition and the exhibited electrochemical properties. [1] S. Ferro and A. De Battisti, Electrochim. Acta, 47, 1637 (2002). [2] S. Ferro and A. De Battisti, Phys. Chem. Chem. Phys., 4, 1915 (2002). [3] A. De Battisti, S. Ferro and M. Dal Colle, J. Phys. Chem. B, 105, 1679 (2001). [4] S. Ferro and A. De Battisti, J. Phys. Chem. B, 106, 2249 (2002). [5] T. Kondo, Y. Einaga, B.V. Sarada, T.N. Rao, D.A. Tryk and A. Fujishima, J. Electrochem. Soc., 149, E179 (2002), and references therein. [6] S. Ferro, A. De Battisti, I. Duo, Ch. Comninellis, W. Haenni and A. Perret, J. Electrochem. Soc., 147, 2614 (2000). [7] P.A. Michaud, E. Mahé, W. Haenni, A. Perret, and Ch. Comninellis, Electrochem. Solid-State Lett., 3, 77 (2000). [8] M. Panizza, I. Duo, P.-A. Michaud, G. Cerisola and Ch. Comninellis, Electrochem. Solid-State Lett., 3, 550 (2000). [9] J.J. Carey, W. Henrietta, C.S. Christ, Jr. and S.N. Lowery, U.S. Pat. 5,399,247 (1995). [10] M. Panizza, P.A. Michaud, G. Cerisola and Ch. Comninellis, J. Electroanal. Chem., 507, 206 (2001), and references therein.

In-situ and ex-situ characterization of BDD film electrodes

DAL COLLE, Maurizio;FERRO, Sergio;DE BATTISTI, Achille
2002

Abstract

Conductive diamond electrodes (boron-doped diamond, BDD) have received great interest because of their wide range of ideal polarizability and high chemical inertness. The first property has suggested their application both for fundamental studies ([1-4] and references therein) and in the field of electroanalysis [5], while the second feature has allowed the electrosynthesis of powerful oxidants [6-8] as well as the use of BDD anodes for wastewater treatment [9,10]. In spite of the diamond stability, a strong chemical or electrochemical oxidation of the initially hydrophobic surface leads to the production of oxygenated groups, which are responsible for the hydrophilic character of the oxidized diamond surface. Once the modification has been obtained, its stability is so high that the pristine electrode surface can be recovered only by hydrogen-plasma treatment; moreover also the electrochemical properties of BDD are significantly modified and possibly useful characteristics become available. Results on both the thermal and the chemical oxidation of diamond specimens have appeared in the literature; as a consequence of the latter oxidation, different oxygenated species are formed on the sample surface, while the thermal treatment seems to cause a preliminary change in crystal morphology, followed by a chemical modification. Notwithstanding the above exposed interest on BDD, only a limited information is available concerning the effect of anodic polarizations on the chemical and electrochemical properties of these electrodes. Accordingly, the present work was based on electrochemical analysis and X-ray Photoelectron Spectroscopy surface characterization of different BDD specimens. In particular, a detailed description of both the nature and the relative abundance of the dominant chemical species have been performed. Discussion and results have been mainly focused on the correlation between the observed quantitative and qualitative changes of the surface composition and the exhibited electrochemical properties. [1] S. Ferro and A. De Battisti, Electrochim. Acta, 47, 1637 (2002). [2] S. Ferro and A. De Battisti, Phys. Chem. Chem. Phys., 4, 1915 (2002). [3] A. De Battisti, S. Ferro and M. Dal Colle, J. Phys. Chem. B, 105, 1679 (2001). [4] S. Ferro and A. De Battisti, J. Phys. Chem. B, 106, 2249 (2002). [5] T. Kondo, Y. Einaga, B.V. Sarada, T.N. Rao, D.A. Tryk and A. Fujishima, J. Electrochem. Soc., 149, E179 (2002), and references therein. [6] S. Ferro, A. De Battisti, I. Duo, Ch. Comninellis, W. Haenni and A. Perret, J. Electrochem. Soc., 147, 2614 (2000). [7] P.A. Michaud, E. Mahé, W. Haenni, A. Perret, and Ch. Comninellis, Electrochem. Solid-State Lett., 3, 77 (2000). [8] M. Panizza, I. Duo, P.-A. Michaud, G. Cerisola and Ch. Comninellis, Electrochem. Solid-State Lett., 3, 550 (2000). [9] J.J. Carey, W. Henrietta, C.S. Christ, Jr. and S.N. Lowery, U.S. Pat. 5,399,247 (1995). [10] M. Panizza, P.A. Michaud, G. Cerisola and Ch. Comninellis, J. Electroanal. Chem., 507, 206 (2001), and references therein.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1687498
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact