H2O2 production at low over‐potentials for electro‐enzymatic halogenation reactions

D. Holtmann, S. Bormann, M. M.C.M van Schie, T. P. De Almeida, W. Zhang, M. Stöckl, R. Ulber, F. Hollmann

Various enzymes utilize hydrogen peroxide as oxidant. Such ‘peroxizymes’ are potentially very attractive catalysts for a broad range of oxidation reactions. Most peroxizymes, however, are inactivated by an excess of H 2 O 2 . The electrochemical reduction of oxygen can be used as an in situ generation method for hydrogen peroxide in order to drive the peroxizymes at high operational stabilities. Using conventional electrode materials, however, also necessitate significant overpotentials thereby reducing the energy‐efficiency of these systems. Here we report a method to coat a gas diffusion electrode with oxidized nanotubes (oCNTs), thereby greatly reducing the overpotential needed to perform an electroenzymatic process. By comparing the un‐modified electrode with the oCNTs‐modified electrode the overpotential can be reduced by approx. 100 mV at comparable product formation rates.

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