Table 1 Comparative data for CoPc1@MWCNTs and CoPc2@MWCNTs catalytic materials during a 1 h electrolysis as a function of the potential in CO2-saturated aqueous solution containing 0.5 M NaHCO3 (pH 7.3)

From: CO2 electrochemical catalytic reduction with a highly active cobalt phthalocyanine

E (V vs. RHE)

Entry

overpotential (mV)a

Catalystb

jCO (mA cm−2)c

TOF (CO, s−1)c

Selectivity (CO, ±0.5%)

−0.676

1

546

CoPc1

13.10 ± 0.79

4.08 ± 0.25

92

2

539

CoPc2

18.10 ± 0.80

6.81 ± 0.30

93

−0.626

3

502

CoPc1

9.61 ± 0.51

2.97 ± 0.16

92

4

498

CoPc2

12.3 ± 0.34

4.46 ± 0.12

92

−0.576

5

458

CoPc1

5.57 ± 0.21

1.63 ± 0.06

86

6

454

CoPc2

7.75 ± 0.16

2.75 ± 0.06

84

−0.526

7

411

CoPc1

3.10 ± 0.07

0.87 ± 0.02

80

8

410

CoPc2

4.33 ± 0.08

1.57 ± 0.03

73

−0.476

9

364

CoPc1

1.62 ± 0.01

0.44 ± 0.01

76

10

363

CoPc2

2.09 ± 0.04

0.74 ± 0.01

65

  1. a Corrected from ohmic drop (uncompensated solution resistance of ca. 3 Ω, electrode surface 0.5 cm2)
  2. bΓ(CoPc1) = 23.3 nmol cm−2, Γ(CoPc2) = 14.4 nmol cm−2 (total added catalysts)
  3. cThe uncertainties represent standard errors obtained from four measurements