A1 Refereed original research article in a scientific journal
NADH-Free Electroenzymatic Reduction of CO2 by Conductive Hydrogel-Conjugated Formate Dehydrogenase
Authors: Kuk SK, Gopinath K, Singh RK, Kim TD, Lee Y, Choi WS, Lee JK, Park CB
Publisher: AMER CHEMICAL SOC
Publication year: 2019
Journal: ACS Catalysis
Journal name in source: ACS CATALYSIS
Journal acronym: ACS CATAL
Volume: 9
Issue: 6
First page : 5584
Last page: 5589
Number of pages: 11
ISSN: 2155-5435
DOI: https://doi.org/10.1021/acscatal.9b00127
Abstract
The electrocatalytic reduction of CO2 under low overpotential and mild conditions using redox enzyme is a propitious route for carbon capture and conversion. Here, we report bioelectrocatalytic CO2 conversion to formate by conjugating a strongly CO2-reductive, W-containing formate dehydrogenase from Clostridium ljungdahlii (ClFDH) to conductive polyaniline (PANi) hydrogel. The ClFDH in the hybrid electrode successfully gained electrons directly from PANi and exhibited high capability for electroenzymatic conversion of CO2 to formate at low overpotential without NADH. We describe a potential electron-transfer pathway in the PANi-ClFDH bioelectrode on the basis of multiple spectroscopic analyses and a QM/MM-based computational study. The 3D-nanostructured PANi hydrogel facilitated rapid electron injection to the active site of ClFDH. In the absence of NADH, the PANi-CIFDH electrode showed stable CO2-to-formate transformation at an overpotential as low as 40 mV, with 1.42 mu mol h(-1) cm(-2) conversion rate, 92.7% faradaic efficiency, and 976 h(-1) turnover frequency.
The electrocatalytic reduction of CO2 under low overpotential and mild conditions using redox enzyme is a propitious route for carbon capture and conversion. Here, we report bioelectrocatalytic CO2 conversion to formate by conjugating a strongly CO2-reductive, W-containing formate dehydrogenase from Clostridium ljungdahlii (ClFDH) to conductive polyaniline (PANi) hydrogel. The ClFDH in the hybrid electrode successfully gained electrons directly from PANi and exhibited high capability for electroenzymatic conversion of CO2 to formate at low overpotential without NADH. We describe a potential electron-transfer pathway in the PANi-ClFDH bioelectrode on the basis of multiple spectroscopic analyses and a QM/MM-based computational study. The 3D-nanostructured PANi hydrogel facilitated rapid electron injection to the active site of ClFDH. In the absence of NADH, the PANi-CIFDH electrode showed stable CO2-to-formate transformation at an overpotential as low as 40 mV, with 1.42 mu mol h(-1) cm(-2) conversion rate, 92.7% faradaic efficiency, and 976 h(-1) turnover frequency.
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