The electrocatalytic oxidation behavior of some C 2 compounds(alcohols, aldehydes and carboxylic acids) on a Pt/Sb ad electrode prepared in situ or ex situ UPD was investigated using pontential sweep and rotating disc electrode methods. It is confirmed that Pt/Sb ad electrode show the most electrocatalytical active to the oxidation of aldehyde functional group and only a little activity to the oxidation of hydroxyl group, but no activity for the oxidation of carboxyl group. The experimental results show that the activity of the Pt/Sb ad electrode prepared by ex situ UPD is higher than that prepared by in situ UPD. The limitations of the electrocatalytic action of the Pt/Sb ad electrode are discussed. It is believed that the electrode shows activity only to the electrode reactions which are inhibited by the poisons intermediates formed in the low potential region. It is indicated by experiments that the surface transformation of the aldehyde molecules is the rate determing step of the electrocatalytic oxidation of the C 2 aldehydes and the product of the oxidation is oxalic acid. According to that a reation mechanism for the oxidation is proposed.


Electrocatalytic oxidation, Adsorbed antimony atom, Platinum electrode, Small organic molecules alcohols, Aldehydes, Carboxylic acids

Publication Date


Online Available Date


Revised Date


Received Date






To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.