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 87

Figure 8 Inhibition of CODH I Ch by cyanate. Potassium cyanate was injected (final concentration
in the solution is 6.67 mM) into the electrochemical cell under gas atmospheres 100 % CO 2
(Figure 8a) and 50 % CO, 50 % CO 2 (Figure 8b). Conditions: 25 C, 0.2 MMES buffer (pH¼7.0),
rotation rate 3500 rpm and scan rate 1 mV s 1 . Reprinted by permission from [ 18 ]; copyright 2013
American Chemical Society.
5.3 How Class IV Carbon Monoxide Dehydrogenases
Respond to Sulfide and Thiocyanate
Sulfide inhibits CODH Ch rapidly when the potential is more positive than -50 mV
but no reaction is observed at more negative potentials, at which CO oxidation
occurs unaffected by its presence [ 18 ]. Sulfide is not a competitive inhibitor like