Abstract
Hematin is a hydroxyl group linked heme site (hydroxyl heme) of the natural enzymes/proteins like hemoglobin, cytochrome c, catalase, and horseradish peroxidase, and it has an important role in the physiological function. Because of problems like poor electron-transfer functionality (on solid electrodes), poor solubility, and molecular aggregation in aqueous solution, limited electrochemical studies have been reported in the literature. A new electrode modification method for hematin using graphitized mesoporous carbon nanomaterial and chitosan for enhanced redox-active and efficient electrocatalytic reductions of hydrogen peroxide and dissolved oxygen in neutral pH was demonstrated in this work. The hematin-modified electrode showed a highly stable redox peak at E°′ = −0.390 V versus Ag/AgCl with a heterogeneous rate constant value of 1.34 s–1. Calculated hematin-active loading concentration (Γhemat = 126 × 10–10 mol cm–2) is ∼20 times higher than the reported values. Physicochemical and electrochemical ...
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