BioChem - DOS

Enzymatic electrosynthesis of formate through CO2 sequestration/reduction in a bioelectrochemical system (BES)

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Srikanth, S.; Maesen, M.; Dominguez-Benetton, X.; Vanbroekhoven, K.; Pant, D.

Bioelectrochemical system (BES) was operated using the enzyme formate dehydrogenase as catalyst at cathode in its free form for the reduction of CO<SUB>2</SUB> into formic acid. Electrosynthesis of formic acid was higher at an operational voltage of -1V vs. Ag/AgCl (9.37mgL<SUP>-1</SUP> CO<SUB>2</SUB>) compared to operation at -0.8V (4.73mgL<SUP>-1</SUP> CO<SUB>2</SUB>) which was strongly supported by the reduction catalytic current. Voltammograms also depicted a reversible redox peak throughout operation at -1V, indicating NAD<SUP>+</SUP> recycling for proton transfer from the source to CO<SUB>2</SUB>. Saturation of the product was observed after 45min of enzyme addition and then reversibility commenced, depicting a lower and stable formic acid concentration throughout the subsequent time of operation. Stability of the enzyme activity after immobilization on the electrode and product yield will be studied further.

2014

Elsevier Applied Science

0960-8524

165

pp.350-354

10.1016/j.biortech.2014.01.129

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART69195208

Bioelectrochemical system (BES); Enzymatic electrosynthesis; CO2 reduction; Formic acid; Formate dehydrogenase (FDH)