Electrochemical impedance spectroscopic studies of the passive layer on the surface of copper as a function of potential

Amtul NASEER; Athar Yaseen KHAN

Makale detayları

Electrochemical impedance spectroscopic studies of the passive layer on the surface of copper as a function of potential

Yazarlar:

Amtul NASEER | Athar Yaseen KHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2010 Vol.34 Issue 5, pp.815-824

Belge Tipi:

Makale

Yayın Tarihi:

4/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000727997

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

Electrochemical impedance spectroscopy (EIS) and cyclic  voltammetry (CV) were used to investigate the oxide layer formed on a  copper disc electrode and the changes that took place when treated  potentiostatically in the range of -0.3 V to 0.9 V in buffer of pH  8.5.  The response of an electrode using EIS, initially at  equilibrium, to an applied potential was then modeled with equivalent  circuits, proposed for different potential regions that completely  illustrated the Cu/oxide/electrolyte systems and their properties in  terms of 2 interfaces.  Criterion for the applicability of equivalent  circuit models was discussed.  Changes in the film/metal interface as  a function of potential were also probed at 30 mHz using Nyquist  plots.  Diffusion coefficient and concentration of mobile ions in the  film calculated from the EIS data came out of the order of 10-6  cm2 s-1 and 10-6 mmol mL-1, respectively.

 

Electrochemical impedance spectroscopy (EIS) and cyclic  voltammetry (CV) were used to investigate the oxide layer formed on a  copper disc electrode and the changes that took place when treated  potentiostatically in the range of -0.3 V to 0.9 V in buffer of pH  8.5.  The response of an electrode using EIS, initially at  equilibrium, to an applied potential was then modeled with equivalent  circuits, proposed for different potential regions that completely  illustrated the Cu/oxide/electrolyte systems and their properties in  terms of 2 interfaces.  Criterion for the applicability of equivalent  circuit models was discussed.  Changes in the film/metal interface as  a function of potential were also probed at 30 mHz using Nyquist  plots.  Diffusion coefficient and concentration of mobile ions in the  film calculated from the EIS data came out of the order of 10-6  cm2 s-1 and 10-6 mmol mL-1, respectively.

Makale detayları

Electrochemical impedance spectroscopic studies of the passive layer on the surface of copper as a function of potential

Yazarlar: Amtul NASEER | Athar Yaseen KHAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2010 Vol.34 Issue 5, pp.815-824

Belge Tipi: Makale

Yayın Tarihi: 4/2010

Belge Dili: Türkçe

Document ID (Org No.): 2000727997

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Amtul NASEER | Athar Yaseen KHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2010 Vol.34 Issue 5, pp.815-824

Belge Tipi:

Makale

Yayın Tarihi:

4/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000727997

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527