| Cathode (Reduction) |
Half-Reaction Standard Potential E°
(volts) |
| Li+(aq) + e- ->
Li(s) |
-3.04 |
| Rb+ + 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 |
| Al3+(aq) + 3e- ->
Al(s) |
-1.66 |
| Mn2+(aq) + 2e- ->
Mg(s) |
-1.19 |
| 2H2O(l) + 2e- ->
H2(g) + 2OH-(aq) |
-0.83 |
| Zn2+(aq) + 2e- ->
Zn(s) |
-0.76 |
| Cr3+(aq) + 3e- ->
Cr(s) |
-0.74 |
| Fe2+(aq) + 2e- ->
Fe(s) |
-0.41 |
| Cd2+(aq) + 2e- ->
Cd(s) |
-0.40 |
| Co2+(aq) + 2e- ->
Co(s) |
-0.28 |
| Ni2+(aq) + 2e- ->
Ni(s) |
-0.23 |
| Sn2+(aq) + 2e- -> Sn(s) |
-0.14 |
| Pb2+(aq) + 2e- ->
Pb(s) |
-0.13 |
| Fe3+(aq) + 3e- ->
Fe(s) |
-0.04 |
| 2H+(aq) + 2e- ->
H2(g) |
0.00 |
| Sn4+(aq) + 2e- ->
Sn2+(aq) |
0.15 |
| Cu2+(aq) + 2e- ->
Cu+(aq) |
0.16 |
| ClO4-(aq) +
H2O(l) + 2e- -> ClO3-(aq) +
2OH-(aq) |
0.17 |
| AgCl(s) + e- -> Ag(s) +
Cl-(aq) |
0.22 |
| Cu2+(aq) + 2e- ->
Cu(s) |
0.34 |
| ClO3-(aq) +
H2O(l) + 2e- ->
ClO2-(aq) + 2OH-(aq) |
0.35 |
| O-(aq) + H2O(l) +
2e- -> I-(aq) + 2OH-(aq) |
0.49 |
| Cu+(aq) + e- ->
Cu(s) |
0.52 |
| I2(s) + 2e- ->
2I-(aq) |
0.54 |
| ClO2-(aq) +
H2O(l) + 2e- -> ClO-(aq) +
2OH-(aq) |
0.59 |
| Fe3+(aq) + e- ->
Fe2+(aq) |
0.77 |
| Hg22+(aq) + 2e-
-> 2Hg(l) |
0.80 |
| Ag+(aq) + e- -> Ag(s) |
0.80 |
| Hg2+(aq) + 2e- ->
Hg(l) |
0.85 |
| ClO-(aq) + H2O(l) +
2e- -> Cl-(aq) + 2OH-(aq) |
0.90 |
| 2Hg2+(aq) + 2e- ->
Hg22+(aq) |
0.90 |
| NO3-(aq) +
4H+(aq) + 3e- -> NO(g) +
2H2O(l) |
0.96 |
| Br2(l) + 2e- ->
2Br-(aq) |
1.07 |
| O2(g) + 4H+(aq) +
4e- -> 2H2O(l) |
1.23 |
| Cr2O72-(aq) +
14H+(aq) + 6e- -> 2Cr3+(aq) +
7H2O(l) |
1.33 |
| Cl2(g) + 2e- ->
2Cl-(aq) |
1.36 |
| Ce4+(aq) + e- ->
Ce3+(aq) |
1.44 |
| MnO4-(aq) +
8H+(aq) + 5e- -> Mn2+(aq) +
4H2O(l) |
1.49 |
| H2O2(aq) +
2H+(aq) + 2e- -> 2H2O(l) |
1.78 |
| Co3+(aq) + e- ->
Co2+(aq) |
1.82 |
| S2O82-(aq) +
2e- -> 2SO42-(aq) |
2.01 |
| O3(g) + 2H+(aq) +
2e- -> O2(g) + H2O(l) |
2.07 |
| F2(g) + 2e- ->
2F-(aq) |
2.87 |