Carbon nanotubes – PEI – Formate dehydrogenase nano-biointerface for the specific bioelectrochemical reduction of CO2 to formate

Reduction of extensive CO2 emissions is one the key challenges that our society must overcome in order to minimize effects global warming and climate change. In this respect, electrochemical reduction via redox enzymes believed be a promising route concentrations, as they specifically catalyze selective reversible way at low potentials mild conditions. work, we describe effective anchoring enzyme Desulfovibrio vulgaris Hildenborough FdhAB formate dehydrogenase using electrostatic interactions favoring oriented immobilization, surface MWCNTs-modified density graphite electrodes with subsequent protection polyethyleneimine (PEI) polymer. The synergistic effect MWCNTs PEI has been studied. High catalytic current densities, up −230 μA cm−2, well high operational stability 11 h continuous long-term measurements, were achieved.