Electrochemical Reduction of Carbon Dioxide to Methanol by Direct Injection of Electrons into Immobilized Enzymes on a Modified Electrode. Issue 6 (17th February 2016)

• Record Type: Journal Article
• Authors: Schlager, Stefanie; Dumitru, Liviu Mihai; Haberbauer, Marianne; Fuchsbauer, Anita; Neugebauer, Helmut; Hiemetsberger, Daniela; Wagner, Annika; Portenkirchner, Engelbert; Sariciftci, Niyazi Serdar
• Is Part Of: ChemSusChem. Volume 9:Issue 6(2016:Mar.)
• Page Start: 631
• Page End: 635
• Publication Date: 2016-02-17
• Subjects: bio-electrocatalysis -- CO2 reduction -- dehydrogenase -- enzymes -- immobilization; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201501496
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: We present results for direct bio‐electrocatalytic reduction of CO2 to C1 products using electrodes with immobilized enzymes. Enzymatic reduction reactions are well known from biological systems where CO2 is selectively reduced to formate, formaldehyde, or methanol at room temperature and ambient pressure. In the past, the use of such enzymatic reductions for CO2 was limited due to the necessity of a sacrificial co‐enzyme, such as nicotinamide adenine dinucleotide (NADH), to supply electrons and the hydrogen equivalent. The method reported here in this paper operates without the co‐enzyme NADH by directly injecting electrons from electrodes into immobilized enzymes. We demonstrate the immobilization of formate, formaldehyde, and alcohol dehydrogenases on one‐and‐the‐same electrode for direct CO2 reduction. Carbon felt is used as working electrode material. An alginate–silicate hybrid gel matrix is used for the immobilization of the enzymes on the electrode. Generation of methanol is observed for the six‐electron reduction with Faradaic efficiencies of around 10 %. This method of immobilization of enzymes on electrodes offers the opportunity for electrochemical application of enzymatic electrodes to many reactions in which a substitution of the expensive sacrificial co‐enzyme NADH is desired. Abstract : Bold enzymes : We present results for direct electrochemical CO2 reduction using electrodes modified with enzyme containing an alginate hybrid gel. Generation of methanol is observed for six‐electron reduction within a three‐step cascade of CO2 reduction, catalyzed by dehydrogenases, with Faradaic efficiencies of around 10 %. This method of immobilizing enzymes on electrodes offers the opportunity for electrochemical application of enzymatic electrodes and substitution of the expensive sacrificial co‐enzyme NADH.