Publications

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

Becker, J.M. and Lielpetere, A. and Szczesny, J. and Junqueira, J.R.C. and Rodríguez-Maciá, P. and Birrell, J.A. and Conzuelo, F. and Schuhmann, W.

ACS APPLIED MATERIALS AND INTERFACES
Volume: 14 Pages: 46421-46426
DOI: 10.1021/acsami.2c09547
Published: 2022

Abstract
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. © 2022 American Chemical Society. All rights reserved.

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