Standard electrode potential (data page)
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The standard electrode potentials are used to determine the electrochemical potential or the electrode potential of an electrochemical cell or Galvanic cell.
These electrode potentials are experimentally calculated with the standard hydrogen electrode, because one cannot determine the voltage from the chemical equations. The hydrogen half reaction was chosen to be zero, and thus all the other values were determined by their voltage with the hydrogen half reaction.
The values below are standard electrode potentials taken at 298 K, 1 bar pressure and in aqueous solution, of concentration 1 molar.
| Half-reaction | E |
|---|---|
| Li+(aq) + e− → Li(s) | −3.04 |
| Rb+(aq) + e− → Rb(s) | −2.98 |
| K+(aq) + e− → K(s) | −2.93 |
| Cs+(aq) + e− → Cs(s) | −2.92 |
| Ba2+(aq) + 2e− → Ba(s) | −2.91 |
| Sr2+(aq) + 2e− → Sr(s) | −2.89 |
| Ca2+(aq) + 2e− → Ca(s) | −2.76 |
| Na+(aq) + e− → Na(s) | −2.71 |
| Mg2+(aq) + 2e− → Mg(s) | −2.38 |
| Be2+(aq) + 2e− → Be(s) | −1,85 |
| Al3+(aq) + 3e− → Al(s) | −1.68 |
| Ti2+(aq) + 2e− → Ti(s) | −1.63 |
| TiO(s) + 2H+ + 2e− → Ti(s) + H2O | −1.31 |
| Ti2O3(s) + 2H+ + 2e− → 2TiO(s) + H2O | −1.23 |
| Ti3+(aq) + 3e− → Ti(s) | −1.21 |
| Mn2+(aq) + 2e− → Mn(s) | −1.18 |
| V2+(aq) + 2e− → V(s) | −1.13 |
| Sn(s) + 4H+ + 4e− → SnH4(g) | −1.07 |
| SiO2(s) + 4H+ + 4e− → Si(s) | −0.91 |
| B(OH)3(aq) + 3H+ + 3e− → B(s) + 3H2O | −0.89 |
| TiO2+(aq) + 2H+ + 4e− → Ti(s) + H2O | −0.86 |
| 2 H2O(l) + 2e- → H2(g) + 2 OH-(aq) | -0.83 |
| Zn2+(aq) + 2e− → Zn(s) | −0.76 |
| Cr3+(aq) + 3e− → Cr(s) | −0.74 |
| Au(CN)2-(aq) + e- → Au(s) +2 CN-(aq) | -0.60 |
| 2TiO2(s) + 2H+ + 2e− → Ti2O3(s) + H2O | −0.56 |
| Ga3+(aq) + 3e− → Ga(s) | −0.53 |
| H3PO2(aq) + H+ + e− → P(s) + 2H2O | −0.51 |
| H3PO3(aq) + 3H+ + 3e− → P(s) + 3H2O | −0.50 |
| H3PO3(aq) + 2H+ + 2e− → H3PO2(aq) + H2O | −0.50 |
| Fe2+(aq) + 2e− → Fe(s) | −0.44 |
| 2CO2(g) + 2H+(aq) + 2e- → HOOCCOOH(aq) | -0.43 |
| Cr3+(aq) + e− → Cr2+(aq) | −0.42 |
| 2H2O(l) + 2e- → H2(g) + 2OH- [1.00x10-7mol L-1] | -0.41 |
| Cd2+(aq) + 2e− → Cd(s) | −0.40 |
| PbSO4(s) + 2e- → Pb(s) +SO42-(aq) | -0.36 |
| GeO2(s) + 2H+ + 2e− → GeO(s) + H2O | −0.37 |
| In3+(aq) + 3e− → In(s) | −0.34 |
| Tl+(aq) + e− → Tl(s) | −0.34 |
| Ge(s) + 4H+ + 4e− → GeH4(g) | −0.29 |
| Co2+(aq) + 2e → Co(s) | −0.28 |
| H3PO4(aq) + 2H+ + 2e− → H3PO3(aq) + H2O | −0.28 |
| Ni2+(aq) + 2e− → Ni(s) | −0.26 |
| V3+(aq) + e− → V2+(aq) | −0.26 |
| As(s) + 3H+ + 3e− → AsH3(g) | −0.23 |
| MoO2(s) + 4H+ + 4e− → Mo(s) + 2H2O | −0.15 |
| Si(s) + 4H+ + 4e− → SiH4(g) | −0.14 |
| Sn2+(aq) + 2e− → Sn(s) | −0.13 |
| O2(g) + H+ + e− → HO2•(aq) | −0.13 |
| Pb2+(aq) + 2e− → Pb(s) | −0.13 |
| WO2(s) + 4H+ + 4e− → W(s) | −0.12 |
| CO2(g) + 2H+ + 2e− → HCOOH(aq) | −0.11 |
| Se(s) + 2H+ + 2e− → H2Se(g) | −0.11 |
| CO2(g) + 2H+ + 2e− → CO(g) + H2O | −0.11 |
| SnO(s) + 2H+ + 2e− → Sn(s) + H2O | −0.10 |
| SnO2(s) + 2H+ + 2e− → SnO(s) + H2O | −0.09 |
| WO3(aq) + 6H+ + 6e− → W(s) | −0.09 |
| P(s) + 3H+ + 3e− → PH3(g) | −0.06 |
| HCOOH(aq) + 2H+ + 2e− → HCHO(aq) + H2O | −0.03 |
| 2H+(aq) + 2e− → H2(g) | 0.00 |
| H2MoO4(aq) + 6H+ + 6e− → Mo(s) + 4H2O | +0.11 |
| Ge4+(aq) + 4e− → Ge(s) | +0.12 |
| C(s) + 4H+ + 4e− → CH4(g) | +0.13 |
| HCHO(aq) + 2H+ + 2e− → CH3OH(aq) | +0.13 |
| S(s) + 2H+ + 2e− → H2S(g) | +0.14 |
| Sn4+(aq) + 2e− → Sn2+(aq) | +0.15 |
| Cu2+(aq) + e− → Cu+(aq) | +0.16 |
| HSO4−(aq) + 3H+ + 2e− → SO2(aq) | +0.16 |
| SbO+ + 2H+ + 3e− → Sb(s) + H2O | +0.20 |
| H3AsO3(aq) + 3H+ + 3e− → As(s) + 3H2O | +0.24 |
| GeO(s) + 2H+ + 2e− → Ge(s) + H2O | +0.26 |
| Bi3+(aq) + 3e− → Bi(s) | +0.32 |
| VO2+(aq) + 2H+ + e− → V3+(aq) | +0.34 |
| Cu2+(aq) + 2e− → Cu(s) | +0.34 |
| [Fe(CN)6]3−(aq) + e− → [Fe(CN)6]4−(aq) | +0.36 |
| O2(g) + 2H2O(l) + 4e- → 4OH-(aq) | +0.40 |
| H2MoO4 + 6H+ + 3e− → Mo3+(aq) | +0.43 |
| CH3OH(aq) + 2H+ + 2e− → CH4(g) + H2O | +0.50 |
| SO2(aq) + 4H+ + 4e− → S(s) + 2H2O | +0.50 |
| Cu+(aq) + e− → Cu(s) | +0.52 |
| CO(g) + 2H+ + 2e− → C(s) + H2O | +0.52 |
| I2(s) + 2e− → 2I−(aq) | +0.54 |
| I3−(aq) + 2e− → 3I−(aq) | +0.54 |
| [AuI4]−(aq) + 3e− → Au(s) + 4I−(aq) | +0.56 |
| H3AsO4(aq) + 2H+ + 2e− → H3AsO3(aq) + H2O | +0.56 |
| [AuI2]−(aq) + e− → Au(s) + 2I−(aq) | +0.58 |
| MnO4-(aq) + 2H2O(l) + 3e- → MnO2(s) + 4 OH-(aq) | +0.59 |
| S2O32− + 6H+ + 4e− → 2S(s) + 3H2O | +0.60 |
| H2MoO4(aq) + 2H+ + 2e− → MoO2(s) + 2H2O | +0.65 |
| O2(g) + 2H+ + 2e− → H2O2(aq) | +0.70 |
| Tl3+(aq) + 3e− → Tl(s) | +0.72 |
| H2SeO3(aq) + 4H+ + 4e− → Se(s) + 3H2O | +0.74 |
| Fe3+(aq) + e− → Fe2+(aq) | +0.77 |
| Hg22+(aq) + 2e− → 2Hg(l) | +0.80 |
| Ag+(aq) + e− → Ag(s) | +0.80 |
| NO3-(aq) + 2H+(aq) +e- → NO2(g) + H2O(l) | +0.80 |
| [AuBr4]−(aq) + 3e− → Au(s) + 4Br−(aq) | +0.85 |
| Hg2+(aq) + 2e− → Hg(l) | +0.85 |
| MnO4−(aq) + H+ + e− → HMnO4−(aq) | +0.90 |
| 2Hg2+(aq) + 2e− → Hg22+(aq) | +0.91 |
| [AuCl4]−(aq) + 3e− → Au(s) + 4Cl−(aq) | +0.93 |
| MnO2(s) + 4H+ + e− → Mn3+(aq) + 2H2O | +0.95 |
| [AuBr2]−(aq) + e− → Au(s) + 2Br−(aq) | +0.96 |
| Br2(l) + 2e− → 2Br−(aq) | +1.07 |
| Br2(aq) + 2e− → 2Br−(aq) | +1.09 |
| IO3−(aq) + 5H+ + 4e− → HIO(aq) + 2H2O | +1.13 |
| [AuCl2]−(aq) + e− → Au(s) + 2Cl−(aq) | +1.15 |
| HSeO4−(aq) + 3H+ + 2e− → H2SeO3(aq) + H2O | +1.15 |
| Ag2O(s) + 2H+ + 2e− → 2Ag(s) | +1.17 |
| ClO3−(aq) + 2H+ + e− → ClO2(g) + H2O | +1.18 |
| ClO2(g) + H+ + e− → HClO2(aq) | +1.19 |
| 2IO3−(aq) + 12H+ + 10e− → I2(s) + 6H2O | +1.20 |
| ClO4−(aq) + 2H+ + 2e− → ClO3−(aq) + H2O | +1.20 |
| O2(g) + 4H+ + 4e− → 2H2O | +1.23 |
| MnO2(s) + 4H+ + 2e− → Mn2+(aq) + 2H2O | +1.23 |
| Tl3+(aq) + 2e− → Tl(s) | +1.25 |
| Cl2(g) + 2e− → 2Cl−(aq) | +1.36 |
| Cr2O72−(aq) + 14H+ + 6e− → 2Cr3+(aq) + 7H2O | +1.38 |
| CoO2(s) + 4H+ + e− → Co3+(aq) + 2H2O | +1.42 |
| 2HIO(aq) + 2H+ + 2e− → I2(s) + 2H2O | +1.44 |
| BrO3−(aq) + 5H+ + 4e− → HBrO(aq) + 2H2O | +1.45 |
| 2BrO3− + 12H+ + 10e− → Br2(l) + 6H2O | +1.48 |
| 2ClO3− + 12H+ + 10e− → Cl2(g) + 6H2O | +1.49 |
| MnO4−(aq) + 8H+ + 5e− → Mn2+(aq) + 4H2O | +1.51 |
| HO2• + H+ + e− → H2O2(aq) | +1.51 |
| Au3+(aq) + 3e− → Au(s) | +1.52 |
| NiO2(s) + 4H+ + 2e− → Ni2+(aq) | +1.59 |
| 2HClO(aq) + 2H+ + 2e− → Cl2(g) + 2H2O | +1.63 |
| Ag2O3(s) + 6H+ + 4e− → 2Ag+(aq) + 3H2O | +1.67 |
| HClO2(aq) + 2H+ + 2e− → HClO(aq) + H2O | +1.67 |
| Pb4+(aq) + 2e− → Pb2+(aq) | +1.69 |
| MnO4−(aq) + 4H+ + 3e− → MnO2(s) + 2H2O | +1.70 |
| H2O2(aq) + 2H+ + 2e− → 2H2O | +1.76 |
| AgO(s) + 2H+ + e− → Ag+(aq) + H2O | +1.77 |
| Au+(aq) + e− → Au(s) | +1.83 |
| BrO4−(aq) + 2H+ + 2e− → BrO3−(aq) + H2O | +1.85 |
| Co3+(aq) + e− → Co2+(aq) | +1.92 |
| Ag2+(aq) + e− → Ag+(aq) | +1.98 |
| HMnO4−(aq) + 3H+ + 2e− → MnO2(s) + 2H2O | +2.09 |
| F2(g) + 2e− → 2F2−(aq) | +2.87 |
| F2(g) + H+ + e− → HF2−(aq) | +2.98 |
| F2(g) + 2H+ + 2e− → 2HF(aq) | +3.05 |
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