Electrochemical investigation of a metalloporphyrin–graphene composite modified electrode and its electrocatalysis on Ascorbic Acid

• The ATPMnG composites modified GC electrode was successfully fabricated.
• The ATPMnG/GC electrode has a good sensitivity, stability and repeatability.
• The ATPMnG/GC electrode was used for the electrocatalytic oxidation of AA.
• ATPMnG has a quite good catalytic activity for oxidation of AA.

In this paper, 5-(4-Aminophenyl)-10,15-20-triphenylporphyrin (ATP) and 5-(4-Aminophenyl)-10,15-20-triphenylporphyrin]Mn(III)(ATPMn) were successfully synthesized. ATP-graphene (ATPG) and ATPMn-graphene (ATPMnG) composite materials have also been prepared and characterized by using UV–vis, FT-IR, SEM, AFM and TEM. GO, ATPM and ATPMnG were used to modify glassy carbon electrode (GC) and investigate the electrocatalytic oxidation features of Ascorbic Acid (AA) by Cyclic voltammetry (CV) and differential pulse voltammetry (DPV), respectively. These results show the oxidation peak current of AA at the ATPMnG/GC electrode have a large shift negatively and the intensity of the oxidation peak current increased significantly compared with that at the other electrodes, which illustrate a quite good catalytic activity for the oxidation of AA at the ATPMnG/GC electrode. The linear relationship between the oxidation peak current and the AA concentration has been built.

ATPMnG was used to modify glassy carbon electrode (GCE) and investigate the electrocatalytic oxidation features of Ascorbic Acid (AA) by Cyclic voltammetry (CV) and differential pulse voltammetry (DPV). These results show the oxidation peak current of AA at the ATPMnG/GC electrode have a large shift negatively and the intensity of the oxidation peak current increased significantly compared with that at the bare GCE, which illustrate a quite good catalytic activity for oxidation of AA at the ATPMnG/GC electrode. The oxidation mechanism of AA has been discussed.Figure optionsDownload as PowerPoint slide