Bioelectrocatalytic Activity of W-Formate Dehydrogenase Covalently Immobilized on Functionalized Gold and Graphite Electrodes

Julia Alvarez-Malmagro, Ana R. Oliveira, Cristina Gutiérrez-Sánchez, Beatriz Villajos, Inês A.C. Pereira, Marisela Vélez, Marcos Pita, Antonio L. De Lacey

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The decrease of greenhouse gases such as CO2 has become a key challenge for the human kind and the study of the electrocatalytic properties of CO2-reducing enzymes such as formate dehydrogenases is of importance for this goal. In this work, we study the covalent bonding of Desulfovibrio vulgaris Hildenborough FdhAB formate dehydrogenase to chemically modified gold and low-density graphite electrodes, using electrostatic interactions for favoring oriented immobilization of the enzyme. Electrochemical measurements show both bioelectrocatalytic oxidation of formate and reduction of CO2 by direct electron transfer (DET). Atomic force microscopy and quartz crystal microbalance characterization, as well as a comparison of direct and mediated electrocatalysis, suggest that a compact layer of formate dehydrogenase was anchored to the electrode surface with some crosslinked aggregates. Furthermore, the operational stability for CO2 electroreduction to formate by DET is shown with approximately 100% Faradaic yield.

Original languageEnglish
Pages (from-to)11891-11900
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number10
DOIs
Publication statusPublished - 17 Mar 2021

Keywords

  • bioelectrocatalysis
  • carbon dioxide reduction
  • formate dehydrogenase
  • metalloenzymes
  • oriented immobilization

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