Investigations of the Efficient Electrocatalytic Interconversions of Carbon Dioxide and Carbon Monoxide by Nickel-Containing Carbon Monoxide Dehydrogenases - The Metal-Driven Biogeochemistry of Gaseous Compounds in the Environment - page 81

achieved with a minimal overpotential [ 17 , 18 ]. Under the same conditions,
CODH II Ch shows very little CO 2 reduction, but a much larger reduction current
is observed if the atmosphere is changed to 100 % CO 2 (as shown in Figure 6 in
Sect. 5.1 ), showing that the marked bias toward CO oxidation displayed by

Figure 5 Electrocatalysis by carbon monoxide dehydrogenases adsorbed on a PGE rotating disk
electrode in the presence of CO 2 and CO. (a) CODH I Ch and CODH II Ch under 50 % CO and 50 %
CO 2 . Reprinted with permission from [ 19 ]; copyright 2013 Wiley-VCH Verlag GmbH &
Co. KGaA. (b) CODH/ACS under different gas ratios. Experimental conditions: 25 C,
0.2 M MES buffer (pH 7.0), electrode rotation rate 3500 rpm, and scan rate 2 mV s 1 (a) and

scan rate 1 mV s 1 (b).