Standard Electrode Potentials - Acidic Media

Half-reactionE°, 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-reactionE°, 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-reactionE°, 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.