Comparative Mechanistic Studies on the Oxidation of Aromatic and Aliphatic Hydroxyl Derivatives in an Alkaline Medium at Preanodized Pt, Au and Pt/Au Electrodes in Presence of Redox Mediators

Sasha KALCHEVA; Philip IOTOV

Article Details

Comparative Mechanistic Studies on the Oxidation of Aromatic and Aliphatic Hydroxyl Derivatives in an Alkaline Medium at Preanodized Pt, Au and Pt/Au Electrodes in Presence of Redox Mediators

Authors:

Sasha KALCHEVA | Philip IOTOV

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 1999 Vol.23 Issue 4, pp.369-380

Document Type:

Article

Publication Date:

3/1999

Document Language:

Turkish

Document ID (Org No.):

2000730362

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527

Abstract:

 

The role of redox mediators obtained from Pt, Au, and Pt/Au  electrodes in the process of electrocatalytic oxidation of  aromatic/aliphatic hydroxyl derivatives in an alkaline medium has been  studied by applying cyclic voltammetry.  Phenol and glycerol were used  as aromatic and aliphatic hydroxyl derivatives in the electrochemical  oxidation experiments.  The results revealed that the presence of  redox mediators formed by preliminary electrode anodization is crucial  for the process of oxidation of aromatic compounds and imposes a  different oxidation route for the aliphatic hydroxyl derivatives.  The  effect of preanodization has been related to the formation and  dissolution of the corresponding higher hydrous oxides which accounts  for the presence of Mn+ in the solution.  On subsequent positive  scanning M(n-x)+ -species are formed on the electrode surface thus  increasing the active sites number.  A tentative mechanism accounting  for the oxidation process in the presence of redox mediators is  suggested.

 

The role of redox mediators obtained from Pt, Au, and Pt/Au  electrodes in the process of electrocatalytic oxidation of  aromatic/aliphatic hydroxyl derivatives in an alkaline medium has been  studied by applying cyclic voltammetry.  Phenol and glycerol were used  as aromatic and aliphatic hydroxyl derivatives in the electrochemical  oxidation experiments.  The results revealed that the presence of  redox mediators formed by preliminary electrode anodization is crucial  for the process of oxidation of aromatic compounds and imposes a  different oxidation route for the aliphatic hydroxyl derivatives.  The  effect of preanodization has been related to the formation and  dissolution of the corresponding higher hydrous oxides which accounts  for the presence of Mn+ in the solution.  On subsequent positive  scanning M(n-x)+ -species are formed on the electrode surface thus  increasing the active sites number.  A tentative mechanism accounting  for the oxidation process in the presence of redox mediators is  suggested.

Article Details

Comparative Mechanistic Studies on the Oxidation of Aromatic and Aliphatic Hydroxyl Derivatives in an Alkaline Medium at Preanodized Pt, Au and Pt/Au Electrodes in Presence of Redox Mediators

Authors: Sasha KALCHEVA | Philip IOTOV

Publisher: TUBITAK

Journal: Turkish Journal of Chemistry 1999 Vol.23 Issue 4, pp.369-380

Document Type: Article

Publication Date: 3/1999

Document Language: Turkish

Document ID (Org No.): 2000730362

Frequency: Bimonthly

eISSN: 1303-6130

pISSN: 1300-0527

Issues

Authors:

Sasha KALCHEVA | Philip IOTOV

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 1999 Vol.23 Issue 4, pp.369-380

Document Type:

Article

Publication Date:

3/1999

Document Language:

Turkish

Document ID (Org No.):

2000730362

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527