Table 1.

Faradaic efficiencies (FE) and current densities for electrocatalytic reduction of CO₂ to CO at an applied potential of −1.95 V vs. SCE in MeCN.

Electrode	Ionic Liquid	FECO	jco (mA/cm2)
GCE	[EMIM]BF4	Trace	<0.03a
Bi-CMEC	[EMIM]BF4	93 ± 7 %	3.77 ± 0.7
Bi-CMEC	None	48 ± 13%	0.11 ± 0.1
Bi-CMEC	[BMIM]BF4	95 ± 6%	5.51 ± 1.2
Bi-CMEC	[BMIM]PF6	90 ± 9%	4.82 ± 0.7
Bi-CMEC	[BMMIM]BF4	76 ± 6%	0.67 ± 0.5

^aTotal current density