Electrochemical Behavior of Ascorbic Acid at the Platinum Nanoparticles/Carbon Nanotube/Polypyrrole Composite Modified Electrode

The electrochemical behavior of ascorbic acid on platinum nanoparticles/carbon nanotubes/ polypyrrole composite modified glassy carbon electrode was studied.It was found that composite modified electrode exhibited a good electrocatalytic effect toward the electrochemical reaction of ascorbic acid and oxidation current of ascorbic acid by increasing 7-times compared with that at bare electrode.The electron transfer process through the modified electrode was investigated by electrochemical impedance spectroscopy.It was found the electrocatalytic behavior of the modified electrode is related to the charge transfer copability.Furthermore,several effects such as the amount of carbon nanotubes,supporting electrolytes,potential scan rate,electrochemical deposit conditions,which might influence electrochemical behavior of ascorbic acid at the modified electrode were also studied.