Table 1 Standard reduction potential of electrochemical CO2 reduction
From: Theoretical insights into selective electrochemical conversion of carbon dioxide
Half reaction | Number of electron | Potential (V vs. SHE) at pH 7 |
|---|---|---|
CO2 (g) + e− → *COO− | 1 | − 1.90 |
CO2 (g) + 2H+ + 2e− → HCOOH (l) | 2 | − 0.61 |
CO2 (g) + H2O (l) + 2e− → HCOO− (aq) + OH− | 2 | − 0.43 |
CO2 (g) + 2H+ + 2e− → CO (g) + H2O (l) | 2 | − 0.53 |
CO2 (g) + H2O (l) + 2e− → CO (g) + 2OH− | 2 | − 0.52 |
CO2 (g) + 4H+ + 4e− → HCHO (l) + H2O (l) | 4 | − 0.48 |
CO2 (g) + 3H2O (l) + 4e− → HCHO (g) + 4OH− | 4 | − 0.89 |
CO2 (g) + 6H+ + 6e− → CH3OH (l) + H2O (l) | 6 | − 0.38 |
CO2 (g) + 5H2O (l) + 6e− → CH3OH (l) + 6OH− | 6 | − 0.81 |
CO2 (g) + 8H+ + 8e− → CH4 (g) + 2H2O (l) | 8 | − 0.24 |
CO2 (g) + 6H2O (l) + 8e− → CH3OH (l) + 8OH− | 8 | − 0.25 |
2CO2 (g) + 12H+ + 12e− → C2H4 (g) + 4H2O (l) | 12 | 0.06 |
2CO2 (g) + 8H2O (l) + 12e− → C2H4 (g) + 12OH− | 12 | − 0.34 |
2CO2 (g) + 12H+ + 12e− → C2H5OH (g) + 3H2O (l) | 12 | 0.08 |
2CO2 (g) + 9H2O (l) + 12e− → C2H5OH (g) + 12OH− | 12 | − 0.33 |