Halfcell
reduction
Half reaction . . . . . . potential
F₂ + 2 e = 2 F^- . . . E^o = 2.889 V
H₂O₂ + 2 H⁺ + 2 e = 2 H₂O (l) . . . E^o = 1.763 V
Au⁺ + e = Au . . . E^o = 1.691 V
MnO₄^- + 8 H⁺ + 5 e = Mn²⁺ + 4 H₂O . . . E^o = 1.512 V
Cl₂ + 2 e = 2 Cl^- . . . E^o = 1.360 V
Cr₂O₇^2- + 14 H⁺ + 6 e = Cr³⁺ + 7 H₂O . . . E^o = 1.330 V
MnO₂ + 4 H⁺ + 2 e = Mn²⁺ + 2 H₂O . . . E^o = 1.229 V
O₂ + 4 H⁺ + 4 e = 2 H₂O . . . E^o = 1.229 V
Br₂ + 2 e = 2 Br^- . . . E^o = 1.078 V
NO₃^- + 4 H⁺ + 3 e = NO + 2 H₂O . . . E^o = 0.964 V
Hg²⁺ + 2 e = Hg . . . E^o = 0.852 V
Ag⁺ + e = Ag . . . E^o = 0.799 V
Hg₂²⁺ + 2 e = 2 Hg . . . E^o = 0.796 V
Fe³⁺ + e = Fe²⁺ . . . E^o = 0.769 V
O₂ + 2 H⁺ + 2 e = H₂O₂ . . . E^o = 0.695 V
I₂ + 2 e = 2 I^- . . . E^o = 0.535 V
Cu⁺ + e = Cu . . . E^o = 0.518 V
O₂ + 2H₂O + 4 e = 4 OH^- . . . E^o = 0.401 V
Cu²⁺ + 2 e = Cu . . . E^o = 0.339 V
Hg₂Cl₂ + 2 e = 2 Hg + 2 Cl^- . . . E^o = 0.268 V
AgCl = Ag + Cl^- . . . E^o = 0.222 V
S + 2 H⁺ + 2 e = H₂O . . . E^o = 0.144 V
AgBr = Ag + Br^- . . . E^o = 0.0732 V

Defined as reference: 2 H⁺ + 2 e = H₂ . . . E^o = 0.000 V

Pb²⁺ + 2 e = Pb . . . E^o = -0.127 V
Sn²⁺ + 2 e = Sn . . . E^o = -0.14 V
AgI = Ag + I^- . . . E^o = -0.152 V
Ni²⁺ + 2 e = Ni . . . E^o = -0.236 V
Co²⁺ + 2 e = Co . . . E^o = -0.282 V
Ag(CN)^2+- + e = Ag + 2 CN^- . . . E^o = -0.31 V
Cd²⁺ + 2 e = Cd . . . E^o = -0.402 V
Fe²⁺ + 2 e = Fe . . . E^o = -0.409 V
Cr³⁺ + 3 e = Cr . . . E^o = -0.74 V
Zn²⁺ + 2 e = Zn . . . E^o = -0.762 V
2 H₂O + 2 e = H + 2 OH^- . . . E^o = -0.828 V
SO₄^2- + H₂O + 2 e = SO₃^2- + 2 OH^- . . . E^o = -0.936 V
Zn(NH₃)₄²⁺ + 2 e = Zn + 4 NH₃ . . . E^o = -1.015 V
Mn²⁺ + 2 e = Mn . . . E^o = -1.182 V
Al³⁺ + 3 e = Al . . . E^o = -1.68 V
Mg²⁺ + 2 e = Mg . . . E^o = -2.357 V
Na⁺ + e = Na . . . E^o = -2.714 V
Ca²⁺ + 2 e = Ca . . . E^o = -2.869 V
Ba²⁺ + 2 e = Ba . . . E^o = -2.906 V
K⁺ + e = K . . . E^o = -2.936 V
Li⁺ + e = Li . . . E^o = -3.040 V