| Half-reaction | E°, V |
| F2(g) + 2H+ + 2e- |
= 2HF(aq) |
3.06 |
| F2 + 2e- |
= 2 F- |
2.87 |
| S2O82- + 2e- |
= 2SO42- |
2.01 |
| Co3+ + e- |
= Co2+ |
1.82 |
| H2O2 + 2H+ + 2e- |
= 2H2O |
1.78 |
| MnO4- + 4H+ + 3e- |
= MnO2(s) + 2H2O |
1.70 |
| H5IO6 + H+ + 2e- |
= IO3- + 3H2O |
1.64 |
| Ce4+ + e- |
= Ce3+ |
1.61 |
| BrO3- + 6H+ + 5e- |
= 1/2 Br2(l) + 3H2O |
1.52 |
| MnO4- + 8H+ + 5e- |
= Mn2+ + 4H2O |
1.51 |
| PbO2 + 4H+ + 2e- |
= Pb2+ + 2H2O |
1.46 |
| Cl2 + 2e- |
= 2Cl- |
1.36 |
| Cr2O72- + 14H+ + 6e- |
= 2Cr3+ + 7H2O |
1.33 |
| MnO2(s) + 4H+ + 2e- |
= Mn2+ + 2H2O |
1.23 |
| O2(g) + 4H+ + 4e- |
= 2H2O(l) |
1.23 |
| IO3- + 6H+ + 5e- |
= 1/2 I2 + 3H2O |
1.20 |
| Br2(aq) + 2e- |
= 2Br- |
1.09 |
| VO2+ + 2H+ + e- |
= VO2+ + H2O |
1.00 |
| HNO2 + H+ + e- |
= NO(g) + H2O |
1.00 |
| NO3- + 3H+ + 2e- |
= HNO2 + H2O |
0.94 |
| 2Hg2+ + 2e- |
= Hg22+ |
0.92 |
| Ag+ + e- |
= Ag |
0.80 |
| Hg22+ + 2e- |
= 2Hg(l) |
0.79 |
| NO3- + 2H+ + e- |
= NO2 + H2O |
0.78 |
| Fe3+ + e- |
= Fe2+ |
0.77 |
| O2(g) + 2H+ + 2e- |
= H2O2(aq) |
0.68 |
| Half-reaction | E°, V |
| Hg2SO4(s) + 2e- |
= 2Hg + SO42- |
0.62 |
| H3AsO4(aq) + 2H+ + 2e- |
= HAsO2 + 2H2O |
0.56 |
| I3- + 2e- |
= 3I- |
0.54 |
| I2+ 2e- |
= 2I- |
0.54 |
| Cu+ + e- |
= Cu |
0.52 |
| O2 + 2H2O + 4e- |
= 4OH- |
0.40 |
| VO2+ + 2H+ + e- |
= V3+ + H2O |
0.36 |
| [Fe(CN)6]3- + e- |
= [Fe(CN)6]4- |
0.36 |
| Cu2+ + 2e- |
= Cu |
0.34 |
| UO22+ + 4H+ + 2e- |
= U4+ + 2H2O |
0.33 |
| BiO+ + 2H+ + 3e- |
= Bi + H2O |
0.32 |
| Hg2Cl2(s) + 2e- |
= 2Hg + 2Cl- |
0.27 |
| AgCl(s) + e- |
= Ag + Cl- |
0.22 |
| SbO+ + 2H+ + 3e- |
= Sb + H2O |
0.21 |
| SO42- + 4H+ + 2e- |
= H2SO3 + H2O |
0.17 |
| Sn4+ + 2e- |
= Sn2+ |
0.15 |
| S(rhombic) + 2H+ + 2e- |
= H2S(aq) |
0.14 |
| CuCl + e- |
= Cu + Cl- |
0.14 |
| TiO2+ + 2H+ + e- |
= Ti3+ + H2O |
0.10 |
| S4O62- + 2e- |
= 2S2O32- |
0.09 |
| AgBr(s) + e- |
= Ag + Br- |
0.07 |
| 2H+ + 2e- |
= H2(g) |
0.00 |
| Pb2+ + 2e- |
= Pb |
-0.13 |
| Sn2+ + 2e- |
= Sn(white) |
-0.14 |
| AgI(s) + e- |
= Ag + I- |
-0.15 |
| Mo3+ + 3e- |
= Mo |
-0.20 |
| Half-reaction | E°, V |
| Ni2+ + 2e- |
= Ni |
-0.25 |
| V3+ + e- |
= V2+ |
-0.26 |
| Co2+ + 2e- |
= Co |
-0.28 |
| [Ag(CN)2]- + e- |
= Ag + 2CN- |
-0.31 |
| Cd2+ + 2e- |
= Cd |
-0.40 |
| Cr3+ + e- |
= Cr2+ |
-0.41 |
| Fe2+ + 2e- |
= Fe |
-0.44 |
| 2CO2+ 2H+ + 2e- |
= H2C2O4 |
-0.49 |
| U4+ + e- |
= U3+ |
-0.61 |
| Cr3+ + 3e- |
= Cr |
-0.74 |
| Zn2+ + 2e- |
= Zn |
-0.76 |
| Mn2+ + 2e- |
= Mn |
-1.18 |
| Zr4+ + 4e- |
= Zr |
-1.53 |
| Ti2+ + 2e- |
= Ti |
-1.63 |
| Al3+ + 3e- |
= Al |
-1.66 |
| Th4+ + 4e- |
= Th |
-1.90 |
| Mg2+ + 2e- |
= Mg |
-2.37 |
| Ce3+ + 3e- |
= Ce |
-2.48 |
| La3+ + 3e- |
= La |
-2.52 |
| Na+ + e- |
= Na |
-2.71 |
| Ca2+ + 2e- |
= Ca |
-2.87 |
| Sr2+ + 2e- |
= Sr |
-2.89 |
| Ba2+ + 2e- |
= Ba |
-2.91 |
| Cs+ + e- |
= Cs |
-2.92 |
| K+ + e- |
= K |
-2.92 |
| Li+ + e- |
= Li |
-3.04 |
Reference: Huheey, pps. A-35 to A-37; A.J. de Bethune and N.A.S. Loud, "Standard Aqueous Electrode Potentials and Temperature Coefficients at 25 ûC," C.A. Hampel, Skokie, IL, 1964.