期刊
ACS CATALYSIS
卷 9, 期 6, 页码 5584-5589出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b00127
关键词
CO2 reduction; NADH-free biocatalysis; formate dehydrogenase; electrocatalysis; bioelectrode
资金
- National Research Foundation (NRF) via the Basic Science Research Program [NRF-2017R1A2B3011676]
- Creative Research Initiative Center, Republic of Korea [NRF-2015 R1A3A2066191]
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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