Bioelectrocatalytic CO2Reduction by Redox Polymer-Wired Carbon Monoxide Dehydrogenase Gas Diffusion Electrodes

Jana M. Becker, Anna Lielpetere, Julian Szczesny, João R.C. Junqueira, Patricia Rodríguez-Maciá, James A. Birrell, Felipe Conzuelo, Wolfgang Schuhmann

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8 Citations (Scopus)


The development of electrodes for efficient CO2reduction while forming valuable compounds is critical. The use of enzymes as catalysts provides the advantage of high catalytic activity in combination with highly selective transformations. We describe the electrical wiring of a carbon monoxide dehydrogenase II from Carboxydothermus hydrogenoformans (ChCODH II) using a cobaltocene-based low-potential redox polymer for the selective reduction of CO2to CO over gas diffusion electrodes. High catalytic current densities of up to -5.5 mA cm-2are achieved, exceeding the performance of previously reported bioelectrodes for CO2reduction based on either carbon monoxide dehydrogenases or formate dehydrogenases. The proposed bioelectrode reveals considerable stability with a half-life of more than 20 h of continuous operation. Product quantification using gas chromatography confirmed the selective transformation of CO2into CO without any parasitic co-reactions at the applied potentials.

Original languageEnglish
Pages (from-to)46421-46426
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number41
Publication statusPublished - 19 Oct 2022


  • carbon monoxide dehydrogenase
  • COreduction
  • enzymes
  • gas diffusion electrodes
  • redox polymers


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