Voltammetric Detection of Oxalic Acid by Using Glassy Carbon Electrodes with Covalently Attached Nitrogen-containing Functional Groups

Abstract

We report on a novel voltammetric detection of oxalic acid by using glassy carbon electrodes with covalently attached nitrogen-containing functional groups prepared by stepwise electrolysis. A glassy carbon electrode electrooxidized in an ammonium carbamate solution was electroreduced at -1.0 V (vs. Ag/AgCl) in 1.0 M sulfuric acid for a long time. We found that the electrocatalytic oxidation wave of oxalic acid obtained by this modified glassy carbon electrode was moved to a more negative potential region than that obtained by a platinum electrode in an acidic medium. A good linearity for the peak current signals was observed in the concentration range from 0.1 to 50 mM.

An Amperometric Flow Injection Analysis of Dissolved Hydrogen Molecule Using Tightly Immobilized Electrodeposited Platinum Particles on Nitrogen-containing Functional Groups Introduced Glassy Carbon Electrodes

“…[1][2][3][4][5][6][7] In addition, the electrochemical activation of carbon surfaces has been used for applications including electroanalytical chemistry and electrocatalysis. [8][9][10] Recently, it has been revealed that nitrogen atoms containing functional groups can be easily introduced onto the surfaces of glassy carbon (GC) electrodes by the electrode oxidation of ammonium carbamate in an aqueous medium at a highly positive electrode potential. We named this electro-oxidized GC electrode an aminated GC electrode.…”