Standard Electrode (Half-Cell) Potentials

Half-Reaction E° (V)
Ag+ + e− → AgAg+ + e− → Ag +0.7996
AgCl + e− → Ag + Cl−AgCl + e− → Ag + Cl− +0.22233
[Ag(CN)2]− + e− → Ag + 2CN−[Ag(CN)2]− + e− → Ag + 2CN− –0.31
Ag2CrO4+2e− → 2Ag + CrO42−Ag2CrO4+2e− → 2Ag + CrO42− +0.45
[Ag(NH3)2]+ + e− → Ag + 2NH3[Ag(NH3)2]+ + e− → Ag + 2NH3 +0.373
[Ag(S2O3)2]3+ + e− → Ag + 2S2O32−[Ag(S2O3)2]3+ + e− → Ag + 2S2O32− +0.017
[AlF6]3−+3e− → Al + 6F−[AlF6]3−+3e− → Al + 6F− –2.07
Al3++3e− → AlAl3++3e− → Al –1.662
Am3++3e− → AmAm3++3e− → Am –2.048
Au3++3e− → AuAu3++3e− → Au +1.498
Au+ + e− → AuAu+ + e− → Au +1.692
Ba++2e− → BaBa++2e− → Ba –2.912
Be++2e− → BeBe++2e− → Be –1.847
Br2(aq)+2e− → 2Br−Br2(aq)+2e− → 2Br− +1.0873
Ca++2e− → CaCa++2e− → Ca –2.868
Ce3+3e− → CeCe3+3e− → Ce –2.483
Ce4+ + e− → Ce3+Ce4+ + e− → Ce3+ +1.61
Cd++2e− → CdCd++2e− → Cd –0.4030
[Cd(CN)4]2−+2e− → Cd + 4CN−[Cd(CN)4]2−+2e− → Cd + 4CN− –1.09
[Cd(NH3)4]++2e− → Cd + 4NH3[Cd(NH3)4]++2e− → Cd + 4NH3 –0.61
CdS + 2e− → Cd + S2−CdS + 2e− → Cd + S2− –1.17
Cl2+2e− → 2Cl−Cl2+2e− → 2Cl− +1.35827
ClO4− + H2O + 2e− → ClO−3 + 2OH−ClO4− + H2O + 2e− → ClO−3 + 2OH− +0.36
ClO3− + H2O + 2e− → ClO−2 + 2OH−ClO3− + H2O + 2e− → ClO−2 + 2OH− +0.33
ClO2− + H2O + 2e−→ ClO− + 2OH−ClO2− + H2O + 2e−→ ClO− + 2OH− +0.66
ClO− + H2O + 2e− → Cl− + 2OH−ClO− + H2O + 2e− → Cl− + 2OH− +0.89
ClO4−+2H++2e−→ ClO−3 + H2OClO4−+2H++2e−→ ClO−3 + H2O +1.189
ClO3−+3H++2e− → HClO2 + H2OClO3−+3H++2e− → HClO2 + H2O +1.21
HClO+H++2e−→Cl−+H2OHClO+H++2e−→Cl−+H2O +1.482
HClO+H++e−→12Cl2+H2OHClO+H++e−→12Cl2+H2O +1.611
HClO2+2H++2e−→HClO+H2OHClO2+2H++2e−→HClO+H2O +1.628
Co3+ + e− → Co+ (2 mol // H2SO4)Co3+ + e− → Co+ (2 mol // H2SO4) +1.83
Co++2e− → CoCo++2e− → Co –0.28
[Co(NH3)6]3+ + e− → [Co(NH3)6]+[Co(NH3)6]3+ + e− → [Co(NH3)6]+ +0.1
Co(OH)3 + e− → Co(OH)2 + OH−Co(OH)3 + e− → Co(OH)2 + OH− +0.17
Cr3+3e− → CrCr3+3e− → Cr –0.744
Cr3+ + e− → Cr+Cr3+ + e− → Cr+ –0.407
Cr++2e− → CrCr++2e− → Cr –0.913
[Cu(CN)2]− + e−→ Cu + 2CN−[Cu(CN)2]− + e−→ Cu + 2CN− –0.43
CrO42− + 4H2O + 3e− → Cr(OH)3 + 5OH−CrO42− + 4H2O + 3e− → Cr(OH)3 + 5OH− –0.13
Cr2O72−+14H++6e−→2Cr3++7H2OCr2O72−+14H++6e−→2Cr3++7H2O +1.232
[Cr(OH)4]−+3e− → Cr + 4OH−[Cr(OH)4]−+3e− → Cr + 4OH− –1.2
Cr(OH)3+3e− → Cr + 3OH−Cr(OH)3+3e− → Cr + 3OH− –1.48
Cu+ + e− → Cu+Cu+ + e− → Cu+ +0.153
Cu++2e− → CuCu++2e− → Cu +0.34
Cu+ + e− → CuCu+ + e− → Cu +0.521
F2+2e− → 2F−F2+2e− → 2F− +2.866
Fe++2e− → FeFe++2e− → Fe –0.447
Fe3+ + e− → Fe+Fe3+ + e− → Fe+ +0.771
[Fe(CN)6]3-  + e− → [Fe(CN)6]4-[Fe(CN)6]3-  + e− → [Fe(CN)6]4- +0.36
Fe(OH)2+2e− → Fe + 2OH−Fe(OH)2+2e− → Fe + 2OH− –0.88
FeS + 2e− → Fe + S2−FeS + 2e− → Fe + S2− –1.01
Ga3++3e− → GaGa3++3e− → Ga –0.549
Gd3++3e− → GdGd3++3e− → Gd –2.279
12H2 + e− → H−12H2 + e− → H− –2.23
2H2O + 2e− → H2 + 2OH−2H2O + 2e− → H2 + 2OH− –0.8277
H2O2+2H++2e−→2H2OH2O2+2H++2e−→2H2O +1.776
2H++2e−→H22H++2e−→H2 0.00
HO2− + H2O + 2e− → 3OH−HO2− + H2O + 2e− → 3OH− +0.878
Hf4++4e− → HfHf4++4e− → Hf –1.55
Hg++2e− → HgHg++2e− → Hg +0.851
2Hg++2e− → Hg+22Hg++2e− → Hg+2 +0.92
Hg2++2e− → 2HgHg2++2e− → 2Hg +0.7973
[HgBr4]2−+2e− → Hg + 4Br−[HgBr4]2−+2e− → Hg + 4Br− +0.21
Hg2Cl2+2e− → 2Hg + 2Cl−Hg2Cl2+2e− → 2Hg + 2Cl− +0.26808
[Hg(CN)4]2−+2e− → Hg + 4CN−[Hg(CN)4]2−+2e− → Hg + 4CN− –0.37
[HgI4]2−+2e−→ Hg + 4I−[HgI4]2−+2e−→ Hg + 4I− –0.04
HgS + 2e− → Hg + S2−HgS + 2e− → Hg + S2− –0.70
I2+2e− → 2I−I2+2e− → 2I− +0.5355
In3++3e− → InIn3++3e− → In –0.3382
K+ + e− → KK+ + e− → K –2.931
La3++3e− → LaLa3++3e− → La –2.52
Li+ + e− → LiLi+ + e− → Li –3.04
Lu3++3e− → LuLu3++3e− → Lu –2.28
Mg++2e− → MgMg++2e− → Mg –2.372
Mn++2e− → MnMn++2e− → Mn –1.185
MnO2 + 2H2O + 2e− → Mn(OH)2 + 2OH−MnO2 + 2H2O + 2e− → Mn(OH)2 + 2OH− –0.05
MnO4− + 2H2O + 3e− → MnO2 + 4OH−MnO4− + 2H2O + 3e− → MnO2 + 4OH− +0.558
MnO2+4H++2e−→Mn2++2H2OMnO2+4H++2e−→Mn2++2H2O +1.23
MnO4−+8H++5e−→Mn2++4H2OMnO4−+8H++5e−→Mn2++4H2O +1.507
Na+ + e− → NaNa+ + e− → Na –2.71
Nd3++3e− → NdNd3++3e− → Nd –2.323
Ni++2e− → NiNi++2e− → Ni –0.257
[Ni(NH3)6]++2e− → Ni + 6NH3[Ni(NH3)6]++2e− → Ni + 6NH3 –0.49
NiO2+4H++2e−→Ni2++2H2ONiO2+4H++2e−→Ni2++2H2O +1.593
NiO2 + 2H2O + 2e− → Ni(OH)2 + 2OH−NiO2 + 2H2O + 2e− → Ni(OH)2 + 2OH− +0.49
NiS + 2e− → Ni + S2−NiS + 2e− → Ni + S2− +0.76
NO3−+4H++3e−→NO+2H2ONO3−+4H++3e−→NO+2H2O +0.957
NO3−+3H++2e−→HNO2+H2ONO3−+3H++2e−→HNO2+H2O +0.92
NO3− + H2O + 2e− → NO−2 + 2OH−NO3− + H2O + 2e− → NO−2 + 2OH− +0.10
Np3+3e− → NpNp3+3e− → Np –1.856
O2 + 2H2O + 4e− → 4OH−O2 + 2H2O + 4e− → 4OH− +0.401
O2+2H++2e−→H2O2O2+2H++2e−→H2O2 +0.695
O2+4H++4e−→2H2OO2+4H++4e−→2H2O +1.229
Pb++2e− → PbPb++2e− → Pb –0.1262
PbO2+SO42−+4H++2e−→PbSO4+2H2OPbO2+SO42−+4H++2e−→PbSO4+2H2O +1.69
PbS + 2e− → Pb + S2−PbS + 2e− → Pb + S2− –0.95
PbSO4 + 2e−→ Pb + SO2−4PbSO4 + 2e−→ Pb + SO2−4 –0.3505
Pd++2e− → Pd +0.987
[PdCl4]2−+2e−→ Pd + 4Cl− +0.591
Pt+ + 2e− → Pt  +1.20
[PtBr4]2−+2e− → Pt + 4Br− +0.58
[PtCl4]2−+2e− → Pt + 4Cl− +0.755
[PtCl6]2−+2e− → [PtCl4]2− + 2Cl− +0.68
Pu3+3e− → Pu –2.03
Ra++2e− → Ra –2.92
Rb+ + e− → Rb –2.98
[RhCl6]3−+3e− → Rh + 6Cl− +0.44
S + 2e− → S2− –0.47627
S+2H++2e−→H2S +0.142
Sc3++3e− → Sc –2.09
Se+2H++2e−→H2Se –0.399
[SiF6]2−+4e− → Si + 6F− –1.2
SiO32− + 3H2O + 4e−→ Si + 6OH− –1.697
SiO2+4H++4e−→Si+2H2O –0.86
Sm3++3e− → Sm –2.304
Sn4++2e− → Sn+ +0.151
Sn++2e− → Sn –0.1375
[SnF6]2−+4e− → Sn + 6F− –0.25
SnS + 2e− → Sn + S2− –0.94
Sr++2e− → Sr –2.89
TeO2+4H++4e−→Te+2H2O +0.593
Th4++4e− → Th –1.90
Ti++2e− → Ti –1.630
U3++3e− → U –1.79
V++2e− → V  –1.19
Y3++3e− → Y –2.37
Zn++2e− → Zn –0.7618
[Zn(CN)4]2−+2e− → Zn + 4CN− –1.26
[Zn(NH3)4]++2e− → Zn + 4NH3 –1.04
Zn(OH)2+2e− → Zn + 2OH− –1.245
[Zn(OH)4]2+2e− → Zn + 4OH− –1.199
ZnS + 2e− → Zn + S2− –1.40
Zr4+4e− → Zr –1.539