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80
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20
0
20
15
10
5
0
–0.75 –0.80 –0.85 –0.90 –0.95 –1.00 –1.05
–0.78 –0.83 –0.89 –0.94 –1.00 –1.04
Potential vs RHE (V)
Potential vs RHE (V)
CO
CoPc–NH2
Post-electrolysis CoPc–NH2
d
MeOH
H2
e
Current density
35
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20
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20
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0
100 200 300 400 500 600 700
Time into electrolysis (min)
300 400 500 600 700 800
Wavelength (nm)
Fig. 4 | Electrocatalytic performance of CoPc–NH2/CNT for CO2 reduction to
methanol. a, Structural comparison between CoPc and CoPc–NH2. b, c,
Potential-dependent product selectivity (FE; b) and partial current density (c)
for CO2 electroreduction catalysed by CoPc–NH2/CNT. Error bars represent
one standard deviation from three measurements. d, Product selectivity (FE)
and total current density for a 12-h electrolysis of CO2 reduction catalysed by
CoPc–NH2/CNT at −1.00 V versus RHE; the FEMeOH value measured after the
electrolysis is shown in striped violet. e, Comparison between UV-Vis
absorption profiles of CoPc–NH2 and post-electrolysis CoPc–NH2.
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activity of cobalt porphyrin in CO2 electroreduction upon immobilization on carbon
materials. Angew. Chem. Int. Ed. 56, 6468–6472 (2017).
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642 | Nature | Vol 575 | 28 November 2019