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H 2 O 2 Production at Low Overpotentials for Electroenzymatic Halogenation Reactions
Author(s) -
Bormann Sebastian,
Schie Morten M. C. H.,
De Almeida Tiago Pedroso,
Zhang Wuyuan,
Stöckl Markus,
Ulber Roland,
Hollmann Frank,
Holtmann Dirk
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201902326
Subject(s) - overpotential , hydrogen peroxide , catalysis , electrochemistry , gas diffusion electrode , halogenation , inorganic chemistry , electrode , chemistry , redox , carbon fibers , materials science , organic chemistry , composite material , composite number
Various enzymes utilize hydrogen peroxide as an 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 to drive the peroxizymes at high operational stabilities. Using conventional electrode materials, however, also necessitates significant overpotentials, thereby reducing the energy efficiency of these systems. This study concerns a method to coat a gas‐diffusion electrode with oxidized carbon nanotubes (oCNTs), thereby greatly reducing the overpotential needed to perform an electroenzymatic halogenation reaction. In comparison to the unmodified electrode, with the oCNTs‐modified electrode the overpotential can be reduced by approximately 100 mV at comparable product formation rates.