1,10-phenanthroline-5,6-dione Modified Ordered Mesoporous Carbon Electrode For Electrocatalytic Oxidation Of NADH

Porous materials have attracted enormous interests because of the high specific surface area and controlled pore size, which have been applied in both the research and industrial fields. Ordered mesoporous carbon (OMC) as a novel carbon nano-material, has been surface functionalized a lot by many researchers due to the high specific surface area, well defined pore size, chemical inertness and easily host-guest chemistry. The electrochemical behavior of1,10-phenanthroline-5,6-dione (PDON) complex adsorbed on ordered mesoporous carbon and its electrocatalytic activity towards NADH was study. Cyclic voltammetric measurements were performed in aqueous phosphate buffer solution at different scan rates and pH values. The redox process of PDON/PDOL at different pH values were evaluated from acid to neutral then to a basic media. The reduction of PDON undergoes three divergent reaction paths which give rise to an alternative reduction form at different pH regions. The adsorbed PDON denoted by PDON/OMC/GCE exhibits an outstanding electrochemical activity towards NADH (catalytic rate constant6.7x10-3M, Sensitivity of11.89nA/mM) as compared to the non-functionalized OMC/GCE (catalytic rate constant4.2x10-3M, sensitivity4.2nA/mM). The over potential is considerably reduced which makes it possible for interference of NADH with Ascorbic Acid, Dopamine and Uric acid.