Standard Electrode Potentials - Basic Media

Half-reactionE°, V
ClO- + H2O + 2e- = Cl- + 2OH- 0.89
HO2- + H2O + 2e- = 3OH- 0.88
BrO- + H2O + 2e- = Br- + 2OH- 0.76
ClO2- + 2H2O + 4e- = Cl- + 4OH- 0.76
ClO3- + 3H2O + 6e- = Cl-+ 6OH- 0.62
BrO3- + 3H2O + 6e- = Br- + 6OH- 0.61
MnO42- + 2H2O + 2e- = MnO2 + 4OH- 0.60
MnO4-+ 2H2O + 3e- = MnO2 + 4OH- 0.59
IO- + H2O + 2e- = I-+ 2OH- 0.49
O2 + 2H2O + 4e- = 4OH- 0.40
ClO4- + H2O + 2e- = ClO3- + 2OH- 0.36
Ag2O + H2O + 2e- = 2Ag + 2OH- 0.34
IO3 - + 3H2O + 6e- = I- + 6OH- 0.26
NO3- + H2O + 2e- = NO2-+ 2OH- 0.01
Half-reactionE°, V
O2 + H2O + 2e- = HO2- + OH- -0.08
2Cu(OH)2+ 2e- = Cu2O + 2OH- + H2O -0.09
CrO42- + 4H2O + 3e- = Cr(OH)3 + 5OH- -0.12
Cu(OH)2 + 2e- = Cu + 2OH- -0.22
Bi2O3 + 3H2O + 6e- = 2Bi + 6OH- -0.46
NO- + H2O + e- = NO + 2OH- -0.46
S + H2O + 2e- = HS- + OH- -0.48
HPbO2- + H2O + 2e- = Pb + 3OH- -0.54
Fe(OH)3 + e- = Fe(OH)2+ OH- -0.56
PbO + H2O + 2e- = Pb + 2OH- -0.58
Ni(OH) 2 + 2e- = Ni + 2OH- -0.72
Co(OH)2+ 2e- = Co + 2OH- -0.73
Cd(OH) 2 + 2e- = Cd + 2OH- -0.82
2H2O + 2e- = H2+ 2OH- -0.83

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.