Iron (III) nanocomposites for enzyme-less biomimetic cathode: A promising material for use in biofuel cells

摘要

In this paper, we discuss the synthesis and electrochemical properties of a new material based on iron oxide nanoparticles stabilized with poly(diallyldimethylammonium chloride) (PDAC); this material can be used as a biomimetic cathode material for the reduction of H_2O_2 in biofuel cells. A metastable phase of iron oxide and iron hydroxide nanoparticles (PDAC-FeOOH/Fe_2O_3-NPs) was synthesized through a single procedure. On the basis of the Stokes-Einstein equation, colloidal particles (diameter: 20 nm) diffused at a considerably slow rate (D = 0.9 × 10 ~(- 11) m s~(- 1)) as compared to conventional molecular redox systems. The quasi-reversible electrochemical process was attributed to the oxidation and reduction of Fe~(3+)/Fe~(2+) from PDAC-FeOOH/Fe_2O_3-NPs; in a manner similar to redox enzymes, it acted as a pseudo-prosthetic group. Further, PDAC-FeOOH/Fe _2O_3-NPs was observed to have high electrocatalytic activity for H_2O_2 reduction along with a significant overpotential shift, ΔE = 0.68 V from - 0.29 to 0.39 V, in the presence and absence of PDAC-FeOOH/Fe_2O_3-NPs. The abovementioned iron oxide nanoparticles are very promising as candidates for further research on biomimetic biofuel cells, suggesting two applications: the preparation of modified electrodes for direct use as cathodes and use as a supporting electrolyte together with H_2O_2.