Reacción
Eº/V
 

XeF+e ⇌ Xe + F
3.4

Cf4++e⇌Cf3+
3.3

Pr4++e⇌Pr3+
3.2

Tb4++e⇌Tb3+
3.1

F2+2H++2e⇌2HF
3.053

Cm4++e⇌Cm3+
3.0

F2+2e⇌H2O
2.866

H2N2O2+2H++2e⇌2N2+2H2O
2.65

Am4++e⇌Am3+
3.3

O(g)+2H++2e⇌H2O
2.6

H4XeO6+2H++2e⇌XeO3+3H2O
2.42

Cu3++e⇌Cu2+
2.4

FeO42-+8H++3e⇌Fe3++4H2O
2.2

F2O+2H++4e⇌H2O+2F
2.153

S2O82-+2H++2e⇌2HSO4
2.123

XeO3+6H++6e⇌Xe+3H2O
2.1

2HFeO4+8H++6e⇌Fe2O3+5H2O
2.09

HFeO4+4H++3e⇌FeOOH+2H2O
2.08

O3+2H++2e⇌O2+H2O
2.076

HFeO4+7H++3e⇌Fe3++4H2O
2.07

OH+e⇌OH
2.02

S2O82-+2e⇌2SO42-
2.01

Cu2O3+6H++2e⇌2Cu2++3H2O
2.0

Ag2++e⇌Ag+
1.98

Co3+ + e⇌ Co2+
1.92

Ag3+ + 2e⇌ Ag+
1.9

Co3+ + e⇌ Co2+(2 molar H2SO4)
1.83

Ag2O2 + 4 H+ + e⇌ 2 Ag + 2 H2O
1.802

Au2+ + e⇌ Au+
1.8

Ag3+ + e⇌ Ag2+
1.8

H2O2 + 2 H+ + 2 e⇌ 2 H2O
1.776

N2O + 2 H+ + 2 e⇌ N2 + H2O
1.766

Ce4+ + e⇌ Ce3+
1.72

CeOH3+ + H+ + e⇌ Ce3+ + H2O
1.715

PtO3 + 2 H+ + 2 e⇌ PtO2 + H2O
1.7

Au+ + e⇌ Au
1.692

PbO2 + SO42- + 4 H+ + 2 e⇌ PbSO4 + 2 H2O
1.6913

MnO4 + 4 H+ + 3 e⇌ MnO2 + 2 H2O
1.679

NiO2 + 4 H+ + 2 e⇌ Ni2+ + 2 H2O
1.678

Bk4+ + e⇌ Bk3+
1.67

HClO2 + 2 H+ + 2 e⇌ HClO + H2O
1.645

HClO2 + 3 H+ + 3 e⇌ 1/2 Cl2 + 2 H2O
1.628

HClO + H+ + e⇌ 1/2 Cl2 + H2O
1.611

H5IO6 + H+ + 2 e⇌ IO3- + 3 H2O
1.601

HBrO + H+ + e⇌ 1/2 Br2(l) + H2O
1.596

Bi2O4 + 4 H+ + 2 e⇌ 2 BiO+ + 2 H2O
1.593

2 NO + 2 H+ + 2 e⇌ N2O + H2O
1.591

HBrO + H+ + e⇌ 1/2 Br2(aq) + H2O
1.574

HClO2 + 3 H+ + 4 e⇌ Cl + 2 H2O
1.57

Mn3+ + e⇌ Mn2+
1.5415

MnO4 + 8 H+ + 5 e⇌ Mn2+ + 4 H2O
1.507

PtO3 + 4 H+ + 2 e⇌ Pt(OH)22+ + H2O
1.5

Au3+ + 3 e⇌ Au
1.498

HO2 + H+ + e⇌ H2O2
1.495

Mn2O3 + 6 H+ + e⇌ 2 Mn2+ + 3 H2O
1.485

HClO + H+ + 2 e⇌ Cl + H2O
1.482

BrO3 + 6 H+ + 5 e⇌ 1/2 Br2 + 3 H2O
1.482

CrO2 + 4 H+ + e⇌ Cr3+ + 2 H2O
1.48

ClO3 + 6 H+ + 5 e⇌ 1/2 Cl2 + 3 H2O
1.47

PbO2 + 4 H+ + 2 e⇌ Pb2+ + 2 H2O
1.455

3ClO3 + 6 H+ + 6 e⇌ I + 3 H2O
1.451

Au(OH)3 + 3 H+ + 3 e⇌ Au + 3 H2O
1.45

2 HIO + 2 H+ + 2 e⇌ I2 + 2 H2O
1.439

BrO3 + 6 H+ + 6 e⇌ Br + 3 H2O
1.423

2 NH3OH+ + H+ + 2 e⇌ N2H5+ + 2 H2O
1.42

Au3+ + 2 e⇌ Au+
1.401

RuO4 + 6 H+ + 4 e⇌ Ru(OH)22+ + 2 H2O
1.4

No3+ + e⇌ No2+
1.4

ClO4 + 8 H+ + 7 e⇌ 1/2 Cl2 + 4 H2O
1.39

ClO4 + 8 H+ + 8 e⇌ Cl + 4 H2O
1.389

Cl2(g) + 2 e⇌ 2Cl
1.35827

HCrO4 + 7 H+ + 3 e⇌ Cr3+ + 4 H2O
1.35

Cr(V) + e⇌ Cr(IV)
1.34

HBrO + H+ + 2 e⇌ Br– + H2O
1.331

PuO2(OH)2 + 2 H+ + 2 e⇌ Pu(OH)4
1.325

AuOH2+ + H+ + 2 e⇌ Au+ + H2O
1.32

2 HNO2 + 4 H+ + 4 e⇌ N2O + 3 H2O
1.297

[PdCl6]2- + 2 e⇌ [PdCl4]2- + 2 Cl
1.288

ClO2 + H+ + e⇌ HClO2
1.277

N2H5+ + 3 H+ + 2 e⇌ 2 NH4+
1.275

Tl3+ + 2 e⇌ Tl+
1.252

[Ru(bipy)3]3+ + e⇌ [Ru(bipy)3]2+
1.24

O3 + H2O + 2 e⇌ O2 + 2 OH
1.24

Cr2O72- + 14 H+ + 6 e⇌ 2 Cr3+ + 7 H2O
1.232

O2 + 4 H+ + 4 e⇌ 2 H2O
1.229

MnO2 + 4 H+ + 2 e⇌ Mn2+ + 2 H2O
1.224

ClO3 + 3 H+ + 2 e⇌ HClO2 + H2O
1.214

PtOH+ + H+ + 2 e⇌ Pt + H2O
1.2

2 IO3 + 12 H+ + 10 e⇌ I2 + 6 H2O
1.195

ClO4 + 2 H+ + 2 e⇌ ClO3 + H2O
1.189

Pt2+ + 2 e⇌ Pt
1.18

Ir3+ + 3 e⇌Ir
1.156

ClO3 + 2 H+ + e⇌ ClO2 + H2O
1.152

SeO42- + 4 H+ + 2 e⇌ H2SeO3 + H2O
1.151

[Fe(phen)3]3+ + e⇌ [Fe(phen)3]2+
1.147

RuO2 + 4 H+ + 2 e⇌ Ru2+ + 2 H2O
1.12

Cu2+ + 2 CN + e⇌ [Cu(CN)2]
1.103

Pu5+ + e⇌ Pu4+
1.099

Br2(aq) + 2 e⇌ 2Br
1.0873

IO3 + 6 H+ + 6 e⇌ I + 3 H2O
1.085

Br2(l) + 2 e⇌ 2Br
1.066

N2O4 + 2 H+ + 2 e⇌ 2 HNO2
1.065

PuO2(OH)2 + H+ + e⇌ PuO2OH + H2O
1.062

[Fe(phen)3]3+ + e⇌ [Fe(phen)3]2+ (1 molar H2SO4)
1.06

RuO4 + 8 H+ + 8 e⇌ Ru + 4H2O
1.038

N2O4 + 4 H+ + 4 e⇌ 2 NO + 2 H2O
1.035

Hg(OH)2 + 2 H+ + 2 e⇌ Hg + 2 H2O
1.034

[Fe(bipy)3]3+ + e⇌ [Fe(bipy)3]2+
1.03

H6TeO6 + 2 H+ + 2 e⇌ TeO2 + 4 H2O
1.02

OsO4 + 4 H + 4 e⇌ OsO2 + 2 H2O
1.02

PtO2 + 2 H+ + 2 e⇌ PtO + H2O
1.01

Pu4+ + e⇌ Pu3+
1.006

AuCl4 + 3 e⇌ Au + 4 Cl
1.002

V(OH)4+ + 2 H+ + e⇌ VO2+ + 3 H2O
1.0

RuO4 + e⇌ RuO4
1.0

PtO2 + 4 H+ + 4 e⇌ Pt + 2 H2O
1.0

VO2+ + 2 H+ + e⇌ VO2+ + H2O
0.991

HIO + H+ + 2 e⇌ I + H2O
0.987

HNO2 + H+ + e⇌ NO + H2O
0.983

AuBr2 + e⇌ Au + 2 Br
0.959

V2O5 + 6 H+ + 2 e⇌ 2 VO2+ + 3 H2O
0.957

NO3 + 4 H+ + 3 e⇌ NO + 2 H2O
0.957

ClO2(aq) + e⇌ ClO2
0.954

Pd2+ + 2 e⇌ Pd
0.951

NO3 + 3 H+ + 2 e⇌ HNO2 + H2O
0.934

2 Hg+ + 2 e⇌ Hg22+
0.92

Po4+ + 2 e⇌ Po2+
0.9

HO2 + H2O + 2 e⇌ 3 OH
0.878

N2O4 + 2 e⇌ 2 NO2
0.867

[IrCl6]2- + e⇌ [IrCl6]3-
0.8665

[Ru(CN)6]3- + e⇌ [Ru(CN)6]4-
0.86

2 HNO2 + 4 H+ + 4 e⇌ H2N2O2 + H2O
0.86

SiO2(quartz) + 4 H+ + 4 e⇌ Si + 2 H2O
0.857

AuBr4 + 3 e⇌ Au + 4 Br
0.854

Hg2+ + 2 e⇌ Hg
0.851

ClO + H2O + 2 e⇌ Cl + 2 OH
0.841

OsO4 + 8 H+ + 8 e⇌ Os + 4 H2O
0.838

RhOH2+ + H + 3 e⇌ Rh + H2O
0.83

[Os(bipy)2]3+ + e⇌ [Os(bipy)2]2+
0.81

2 NO3 + 4 H+ + 2 e⇌ N2O4 + 2 H2O
0.803

[Os(bipy)3]3+ + e⇌ [Os(bipy)3]2+
0.8

Ag+ + e⇌ Ag
0.7996

Hg22+ + 2 e⇌ 2 Hg
0.7973

TcO4 + 4 H+ + 3 e⇌ TcO2 + 2 H2O
0.782

[Fe(bipy)2]3+ + e⇌ [Fe(bipy)2]2+
0.78

AgF + e⇌ Ag + F
0.779

Fe3+ + e⇌ Fe2+
0.771

[IrCl6]3- + 3 e⇌ Ir + 6 Cl
0.77

(CNS)2 + 2 e⇌ 2 CNS
0.77

ReO4 + 2 H+ +e⇌ ReO3 + H2O
0.768

BrO + H2O + 2 e⇌ Br + 2 OH
0.761

Po4+ + 4 e⇌ Po
0.76

2 NO + H2O + 2 e⇌ N2O + 2 OH
0.76

ClO2 + 2 H2O + 4 e⇌ Cl + 4 OH
0.76

Rh3+ + 3 e⇌ Rh
0.758

[PtCl4]2- + 2 e⇌ Pt + 4 Cl
0.755

Tl3+ + 3 e⇌ Tl
0.741

Ag2O3 + H2O + 2 e⇌ 2 AgO + 2 OH
0.739

H3IO62- + 2 e⇌IO3 + 3 OH
0.7

p–benzoquinona + 2 H+ + 2 e⇌ hydroquinona
0.6992

O2 + 2 H+ + 2 e⇌ H2O2
0.695

[PtCl6]2- + 2 e⇌ [PtCl4]2- + 2 Cl
0.68

Sb2O5(senarmontita) + 4 H+ + 4 e⇌ Sb2O5 + 2 H2O
0.671

ClO2 + H2O + 2 e⇌ ClO + 2 OH
0.66

Ag2SO4 + 2 e⇌ 2 Ag + SO42-
0.654

Sb2O5(valentinita) + 4 H+ + 4 e⇌ Sb2O3 + 2 H2O
0.649

Ag(ac) + e⇌ Ag + (ac)
0.643

Hg2HPO4 + 2 e⇌ 2 Hg + HPO42-
0.6359

ClO3 + 3 H2O + 6 e⇌ Cl + 6 OH
0.62

Hg2SO4 + 2 e⇌ 2 Hg + SO42-
0.6125

UO2+ + 4 H+ + e⇌ U4+ + 2 H2O
0.612

BrO3 + 3 H2O + 6 e⇌ Br + 6 OH
0.61

2 AgO + H2O + 2 e⇌ Ag2O + 2 OH
0.607

MnO42- + 2 H2O + 2 e⇌ MnO2 + 4 OH
0.6

Rh+ + e⇌ Rh
0.6

Rh2+ + 2 e⇌ Rh
0.6

MnO4 + 2 H2O + 3 e⇌ MnO2 + 4 OH
0.595

TeO2 + 4 H+ + 4 e⇌ Te + 2 H2O
0.593

[PdCl4]2- + 2 e⇌ Pd + 4 Cl
0.591

RuO4 + e⇌ RuO42-
0.59

Sb2O5 + 6 H+ + 4 e⇌ 2 SbO+ + 3 H2O
0.581

Te4+ + 4 e⇌ Te
0.568

AgNO2 + e⇌ Ag + NO2-
0.564

S2O62- + 4 H+ + 2 e⇌ 2 H2SO3
0.564

H3AsO4 + 2 H+ + 2 e⇌ HAsO2 + 2 H2O
0.56

MnO2 + e⇌ MnO2
0.558

AgBrO3 + e⇌ Ag + BrO3
0.546

I3 + 2 e⇌ 3 I
0.536

I2 + 2 e⇌ 2 I
0.5355

Cu+ + e⇌ Cu
0.521

Hg2(ac)2 + 2 e⇌ 2 Hg + 2(ac)
0.51163

ReO4 + 4 H+ + 3 e⇌ ReO2 + 2 H2O
0.51

Bi+ + e⇌ Bi
0.5

NiO2 + 2 H2O + 2 e⇌ Ni(OH)2 + 2 OH
0.49

IO + H2O + 2 e⇌ I + 2 OH
0.485

TeO4 + 8 H+ + 7 e⇌ Te + 4 H2O
0.472

TcO4 + 8 H+ + 7 e⇌ Tc + 4 H2O
0.472

Ag2CO3 + 2 e⇌ 2 Ag + CO32-
0.47

Ag2WO4 + 2 e⇌ 2 Ag + WO42-
0.466

Ag2C2O4 + 2 e⇌ 2 Ag + C2O42-
0.4647

Ag2MoO4 + 2 e⇌ 2 Ag + MoO42-
0.4573

Ru2+ + 2 e⇌ Ru
0.455

H2SO3 + 4 H+ + 4 e⇌ S + 3 H2O
0.449

Ag2CrO4 + 2 e⇌ 2 Ag + CrO42-
0.447

[RhCl6]3- + 3 e⇌ Rh + 6 Cl
0.431

AgOCN + e⇌ Ag + OCN
0.41

O2 + 2 H2O + 4 e⇌ 4 OH
0.401

Tc2+ + 2 e⇌ Tc
0.4

[Ferricinio]+ + e⇌ Ferroceno
0.4

(CN)2 + 2 H+ + 2 e⇌ 2 HCN
0.373

ReO4 + 8 H+ + 7 e⇌ Re + 4 H2O
0.368

Ag2SeO3 + 2 e⇌ 2 Ag + SeO32-
0.3629

ClO4 + H2O + 2 e⇌ ClO3 + 2 OH
0.36

[Fe(CN)6]3- + e⇌ [Fe(CN)6]4-
0.358

AgIO3 + e⇌ Ag + IO3
0.354

Cu2+ + 2 e⇌ Cu(Hg)
0.345

Ag2O + H2O + 2 e⇌ 2 Ag + 2 OH
0.342

Cu2+ + 2 e⇌ Cu
0.3419

VO2+ + 2 H+ + e⇌ V3+ + H2O
0.337

Electrodo de calomelanos 0.1 molar KCl
0.3337

2 HCNO + 2 H+ + 2 e⇌ (CN)2 + 2 H2O
0.33

ClO3 + H2O + 2 e⇌ ClO2 + 2 OH
0.33

UO22+ + 4 H+ + 2 e⇌ U4+ + 2 H2O
0.327

BiO+ + 2 H+ + 3 e⇌ Bi + H2O
0.32

Bi3+ + 3 e⇌ Bi
0.308

Tc3+ + e⇌ Tc2+
0.3

Re3+ + 3 e⇌ Re
0.3

At2 + 2 e⇌ 2 At
0.3

Electrodo de calomelanos 1 molar KCl (NCE)
0.2801

Electrodo de calomelanos 1 molal KCl
0.28

Hg2Cl2 + 2 e⇌ 2 Hg + 2 Cl
0.26808

IO3 + 3 H2O + 6 e⇌ I + OH
0.26

ReO2 + 4 H+ + 4 e⇌ Re + 2 H2O
0.2513

Ru3+ + e⇌ Ru2+
0.2487

HAsO2 + 3 H+ + 3 e⇌ As + 2 H2O
0.248

PbO2 + H2O + 2 e⇌ PbO + 2 OH
0.247

Electrodo de calomelanos saturado con KCl
0.2412

Ru3+ + e⇌ Ru2+
0.24

Ge2+ + 2 e⇌ Ge
0.24

Electrodo de calomelanos saturado con NaCl (SSCE)
0.236

As2O3 + 6 H+ + 6 e⇌ 2 As + 3 H2O
0.234

[Ru(H2O)6]3+ + e⇌ [Ru(H2O)6]2+
0.23

AgCl + e⇌ Ag + Cl
0.22233

SbO+ + 2 H+ + 3 e⇌ Sb + 2 H2O
0.212

[Ru(en)3]3+ + e⇌ [Ru(en)3]2+
0.21

Bi3+ + 2 e⇌ Bi+
0.2

SO42- + 4 H+ + 2 e⇌ H2SO3 + H2O
0.172

Co(OH)3 + e⇌ Co(OH)2 + OH
0.17

Fe2O3 + 4 H+ + 2 e⇌ 2 FeOH+ + H2O
0.16

BiCl4 + 3 e⇌ Bi + 4 Cl
0.16

BiOCl + 2 H+ + 3 e⇌ Bi + Cl + H2O
0.1583

Cu2+ + e⇌ Cu+
0.153

Sb2O3 + 6 H+ + 6 e⇌ 2 Sb + 3 H2O
0.152

Sn4+ + 2 e⇌ Sn2+
0.151

2 NO2 + 3 H2O + 4 e⇌ N2O + 6 OH
0.15

Mn(OH)3 + e⇌ Mn(OH)2 + OH
0.15

IO3 + 2 H2O + 4 e⇌ IO + 4 OH
0.15

Ag4[Fe(CN)6] + 4 e⇌ 4 Ag + [Fe(CN)6]4-
0.1478

Np4+ + e⇌ Np3+
0.147

Sn(OH)3+ + 3 H+ + 2e⇌ Sn2+ + 3 H2O
0.142

S + 2H+ + 2 e⇌ H2S(aq)
0.142

[V(phen)3]3+ + e⇌ [V(phen)3]2+
0.14

Pt(OH)2 + 2 e⇌ Pt + 2 OH
0.14

Hg2Br2 + 2 e⇌ 2 Hg + 2 Br
0.13923

Ge4+ + 4 e⇌ Ge
0.124

Hg2O + H2O + 2 e⇌ 2 Hg + 2 OH
0.123

[Co(NH3)6]3+ + e⇌ [Co(NH3)6]2+
0.108

W3+ + 3 e⇌ W
0.1

[Ru(NH3)6]3+ + e⇌ [Ru(NH3)6]2+
0.1

2 NO + 2 e⇌ N2O22-
0.1

Ir2O3 + 3 H2O + 6 e⇌ 2 Ir + 6 OH
0.098

HgO + H2O + 2 e⇌ Hg + 2 OH
0.0977

N2 + 2 H2O + 6 H+ + 6 e⇌ 2 NH4OH
0.092

AgSCN + e⇌ Ag + SCN
0.8951

H3Mo7O243- + 45 H+ + 42 e⇌ 7 Mo + 24 H2O
0.082

S4O62- + 2 e⇌ 2 S2O32-
0.08

MoO3 + 6 H+ + 6 e⇌ Mo + 3 H2O
0.075

AgBr + e⇌ Ag + Br
0.07133

Pd(OH)2 + 2 e⇌ Pd + 2 OH
0.07

UO22+ + e⇌ UO2+
0.062

WO3 + 2 H+ + 2 e⇌ WO2 + H2O
0.036

SeO42- + H2O + 2 e⇌ SeO32- + 2 OH
0.05

Tl2O3 + 3 H2O + 4 e⇌ 2 Tl+ + 6 OH
0.02

NO3 + H2O + 2 e⇌ NO2 + 2 OH
0.01

Ge4+ + 2 e⇌ Ge2+
0.0

CuI2 + e⇌ Cu + 2 I
0.0

2 H+ + 2 e⇌ H2
0.0

2 D+ + 2 e⇌ D2
-0.013

AgCN + e⇌ Ag + CN
-0.017

2 WO3 + 2 H+ + 2 e⇌ W2O5 + H2O
-0.029

W2O5 + 2 H+ + 2 e⇌ 2 WO2 + H2O
-0.031

Ag2S + 2 H+ + 2 e⇌ 2 Ag + H2S
-0.0366

Fe3+ + 3 e⇌ Fe
-0.037

Hg2I2 + 2 e⇌ 2 Hg + 2 I
-0.0405

Tl(OH)3 + 2 e⇌ TlOH + 2 OH
-0.05

TiOH3+ + H+ + e⇌ Ti3+ + H2O
-0.055

2 H2SO3 + H+ + 2 e⇌ HS2O4 + 2 H2O
-0.056

P(blanco) + 3 H+ + 3 e⇌ PH3(g)
-0.063

O2 + H2O + 2 e⇌ HO2 + OH
-0.076

2 Cu(OH)2 + 2 e⇌ Cu2O + 2 OH + H2O
-0.08

Se + 2 H+ + 2 e⇌ H2Se
-0.082

WO3 + 6 H+ + 6 e⇌ W + 3 H2O
-0.09

SnO2 + 4 H+ + 2 e⇌ Sn2+ + 2 H2O
-0.094

Md3+ + e⇌ Md2+
-0.1

P(rojo) + 3 H+ + 3 e⇌ PH3(g)
-0.111

SnO2 + 4 H+ + 4 e⇌ Sn + 2 H2O
-0.117

GeO2 + 2 H+ + 2 e⇌ GeO + H2O
-0.118

WO2 + 4 H+ + 4 e⇌ W + 2 H2O
-0.119

Pb2+ + 2 e⇌ Pb(Hg)
-0.1205

Pb2+ + 2 e⇌ Pb
-0.1262

CrO42- + 4 H2O + 3 e⇌ Cr(OH)3 + 5 OH
-0.13

Sn2+ + 2 e⇌ Sn
-0.1375

In+ + e⇌ In
-0.14

O2 + 2 H2O + 2 e⇌ H2O2 + 2 OH
-0.146

MoO2 + 4 H+ + 4 e⇌ Mo + 4 H2O
-0.152

AgI + e⇌ Ag + I
-0.15224

2 NO2 + 2 H2O + 4 e⇌ N2O22- + 4 OH
-0.18

H2GeO3 + 4 H+ + 4 e⇌ Ge + 3 H2O
-0.182

SnO2 + 3 H+ + 2 e⇌ SnOH+ + H2O
-0.194

CO2 + 2 H+ + 2 e⇌ HCOOH
-0.199

Mo3+ + 3 e⇌ Mo
-0.2

Ga+ + e⇌ Ga
-0.2

2 SO22- + 4 H+ + 2 e⇌ S2O62- + H2O
-0.22

Cu(OH)2 + 2 e⇌ Cu + 2 OH
-0.222

V2O5 + 10 H+ + 10 e⇌ 2 V + 5 H2O
-0.242

CdSO4 + 2 e⇌ Cd + SO42-
-0.246

V(OH)4+ + 4 H+ + 5 e⇌ V + 4 H2O
-0.254

V3+ + e⇌ V2+
-0.255

Ni2+ + 2 e⇌ Ni
-0.257

PbCl2 + 2 e⇌ Pb + 2 Cl
-0.2675

H3PO4 + 2 H+ + 2 e⇌ H3PO3 + H2O
-0.276

Co2+ + 2 e⇌ Co
-0.28

PbBr2 + 2 e⇌ Pb + 2 Br
-0.284

Tl+ + e⇌ Tl(Hg)
-0.3338

Tl+ + e⇌ Tl
-0.336

In3+ + 3 e⇌ In
-0.3382

TlOH + e⇌ Tl + OH
-0.34

PbF2 + 2 e⇌ Pb + 2 F
-0.3444

PbSO4 + 2 e⇌ Pb(Hg) + SO42-
-0.3505

Cd2+ + 2 e⇌ Cd(Hg)
-0.3521

PbSO4 + 2 e⇌ Pb + SO42-
-0.3588

Cu2O + H2O + 2 e⇌ 2 Cu + 2 OH
-0.36

Eu3+ + e⇌ Eu2+
-0.36

PbI2 + 2 e⇌ Pb + 2 I
-0.365

SeO32- + 3 H2O + 4 e⇌ Se + 6 OH
-0.366

Se + 2 H+ + 2 e⇌ H2Se(aq)
-0.399

In2+ + e⇌ In+
-0.4

Cd2+ + 2 e⇌ Cd
-0.403

Cr3+ + e⇌ Cr2+
-0.407

2 S + 2 e⇌ S22-
-0.42836

Tl2SO4 + 2 e⇌ Tl + SO42-
-0.436

In3+ + 2 e⇌ In+
-0.443

Fe2+ + 2 e⇌ Fe
-0.447

H3PO3 + 3 H+ + 3 e⇌ P + 3 H2O
-0.454

Bi2O3 + 3 H2O + 6 e⇌ 2 Bi + 6 OH
-0.46

NO2 + H2O + e⇌ NO + 2 OH
-0.46

PbHPO4 + 2 e⇌ Pb + HPO42-
-0.465

S + 2 e⇌ S2-
-0.47627

S + H2O + 2 e⇌ HS + OH
-0.478

B(OH)3 + 7 H+ + 8 e⇌ BH4- + 3 H2O
-0.481

In3+ + e⇌ In2+
-0.49

ZnOH+ + H+ + 2 e⇌ Zn + H2O
-0.497

GaOH2+ + H+ + 3 e⇌ Ga + H2O
-0.498

H3PO3 + 2 H+ + 2 e⇌ H3PO2 + H2O
-0.499

TiO2 + 4 H+ + 2 e⇌ Ti2+ + 2 H2O
-0.502

H3PO2 + H+ + e⇌ P + 2 H2O
-0.508

Sb + 3 H+ + 3 e⇌ SbH3
-0.51

HPbO2 + H2O + 2 e⇌ Pb + 3 OH
-0.537

Ga3+ + 3 e⇌ Ga
-0.549

TlCl + e⇌ Tl + Cl
-0.5568

Fe(OH)3 + e⇌ Fe(OH)2 + OH
-0.56

TeO32- + 3 H2O + 4 e⇌ Te + 6 OH
-0.57

2 SO32- + 3 H2O + 4 e⇌ S2O32- + 6 OH
-0.571

PbO + H2O + 2 e⇌ Pb + 2 OH
-0.58

ReO2 + 4 H2O + 7 e⇌ Re + 8 OH
-0.584

SbO3 + H2O + 2 e⇌ SbO2 + 2 OH
-0.59

Ta3+ + 3 e⇌ Ta
-0.6

U4+ + e⇌ U3+
-0.607

As + 3 H+ + 3 e⇌ AsH3
-0.608

Nb2O5 + 10 H+ + 10 e⇌ 2 Nb + 5 H2O
-0.644

NbO2 + 2 H+ + 2 e⇌ NbO + H2O
-0.646

Cd(OH)42- + 2 e⇌ Cd + 4 OH
-0.658

TlBr + e⇌ Tl + Br
-0.658

SbO2 + 2 H2O + 3 e⇌ Sb + 4 OH
-0.66

AsO2 + 2 H2O + 3 e⇌ As + 4 OH
-0.68

NbO2 + 4 H+ + 4 e⇌ Nb + 2 H2O
-0.69

Ag2S + 2 e⇌ 2 Ag + S2-
-0.691

AsO43- + 2 H2O + 2 e⇌ AsO2 + 4 OH
-0.71

Ni(OH)2 + 2 e⇌ Ni + 2 OH
-0.72

Co(OH)2 + 2 e⇌ Co + 2 OH
-0.73

NbO + 2 H+ + 2 e⇌ Nb + H2O
-0.733

H2SeO3 + 4 H+ + 4 e⇌ Se + 3 H2O
-0.74

Cr3+ + 3 e⇌ Cr
-0.744

Ta2O5 + 10 H+ + 10 e⇌ 2 Ta + 5 H2O
-0.75

TlI + e⇌ Tl + I
-0.752

Zn2+ + 2 e⇌ Zn
-0.7618

Zn2+ + 2 e⇌ Zn(Hg)
-0.7628

CdO + H2O + 2 e⇌ Cd + 2 OH
-0.783

Te + 2 H+ + 2 e⇌ H2Te
-0.793

ZnSO4·7H2O (sat.) + 2 e⇌ Zn(Hg) + SO42- + 7 H2O
-0.7993

Bi + 3 H+ + 3 e⇌ BiH3
-0.8

SiO + 2 H+ + 2 e⇌ Si + H2O
-0.8

Cd(OH)2 + 2 e⇌ Cd(Hg) + 2 OH
-0.809

2 H2O + 2 e⇌ H2 + 2 OH
-0.8277

2 NO3 + 2 H2O + 2 e⇌ N2O4 + 4 OH
-0.85

H3BO3 + 3 H+ + 3 e⇌ B + 3 H2O
-0.8698

P + 3 H2O + 3 e⇌ PH3(g) + 3 OH
-0.87

Ti3+ + e⇌ Ti2+
-0.9

HSnO2 + H2O + 2 e⇌ Sn + 3 OH
-0.909

Cr2+ + 2 e⇌ Cr
-0.913

Se + 2 e⇌ Se2-
-0.924

SO42- + H2O + 2 e⇌ SO32- + 2 OH
-0.93

Sn(OH)62- + 2 e⇌ HSnO2 + 3 OH + H2O
-0.93

SnO2 + 2 H2O + 4 e⇌ Sn + 4 OH
-0.945

In(OH)3 + 3 e⇌ In + 3 OH
-0.99

NpO2 + H2O + H+ + e⇌ Np(OH)3
-0.962

In(OH)4 + 3 e⇌ In + 4 OH
-1.007

In2O3 + 3 H2O + 6 e⇌ 2 In + 6 OH
-1.034

PO43- + 2 H2O + 2 e⇌ HPO32- + 3 OH
-1.05

Yb3+ + e⇌ Yb2+
-1.05

Nb3+ + 3 e⇌ Nb
-1.099

Fm3+ + e⇌ Fm2+
-1.1

2 SO32- + 2 H2O + 2 e⇌ S2O42- + 4 OH
-1.12

Te + 2 e⇌ Te2-
-1.143

V2+ + 2 e⇌ V
-1.175

Mn2+ + 2 e⇌ Mn
-1.185

Zn(OH)42- + 2 e⇌ Zn + 4 OH
-1.199

CrO2 + 2 H2O + 3 e⇌ Cr + 4 OH
-1.2

No3+ + 3 e⇌ No
-1.2

ZnO2 + 2 H2O + 2 e⇌ Zn + 4 OH
-1.215

H2GaO3 + H2O + 3 e⇌ Ga + 4 OH
-1.219

H2BO3 + 5 H2O + 8 e⇌ BH4- + 8 OH
-1.24

SiF62- + 4 e⇌ Si + 6 F
-1.24

Zn(OH)2 + 2 e⇌ Zn + 2 OH
-1.249

ZnO + H2O + 2 e⇌ Zn + 2 OH
-1.26

Es3+ + e⇌ Es2+
-1.3

Pa3+ + 3 e⇌ Pa
-1.34

Ti3+ + 3 e⇌ Ti
-1.37

Ce3+ + 3 e⇌ Ce(Hg)
-1.4373

UO22+ + 4 H+ + 6 e⇌ U + 2 H2O
-1.444

Zr4+ + 4 e⇌ Zr
-1.45

Cr(OH)3 + 3 e⇌ Cr + 3 OH
-1.48

Pa4+ + 4 e⇌ Pa
-1.49

HfO2 + 4 H+ + 4 e⇌ Hf + 2 H2O
-1.505

Hf4+ + 4 e⇌ Hf
-1.55

Sm3+ + e⇌ Sm2+
-1.55

ZrO2 + 4 H+ + 4 e⇌ Zr + 2 H2O
-1.553

Mn(OH)2 + 2 e⇌ Mn + 2 OH
-1.56

Ba2+ + 2 e⇌ Ba(Hg)
-1.57

Bk2+ + 2 e⇌ Bk
-1.6

Cf3+ + e⇌ Cf2+
-1.6

Ti2+ + 2 e⇌ Ti
-1.63

Md3+ + 3 e⇌ Md
-1.65

HPO32- + 2 H2O + 2 e⇌ H2PO2 + 3 OH
-1.65

Al3+ + 3 e⇌ Al
-1.662

SiO32- + H2O + 4 e⇌ Si + 6 OH
-1.697

HPO32- + 2 H2O + 3 e⇌ P + 5 OH
-1.71

HfO2+ + 2 H+ + 4 e⇌ Hf + H2O
-1.724

ThO2 + 4 H+ + 4 e⇌ Th + 2 H2O
-1.789

H2BO3 + H2O + 3 e⇌ B + 4 OH
-1.79

Sr2+ + 2 e⇌ Sr(Hg)
-1.793

U3+ + 3 e⇌ U
-1.798

H2PO2 + e⇌ P + 2 OH
-1.82

Be2+ + 2 e⇌ Be
-1.847

Np3+ + 3 e⇌ Np
-1.856

Fm3+ + 3 e⇌ Fm
-1.89

Th4+ + 4 e⇌ Th
-1.899

Am2+ + 2 e⇌ Am
-1.9

Pa4+ + e⇌ Pa3+
-1.9

Es3+ + 3 e⇌ Es
-1.91

Cf3+ + 3 e⇌ Cf
-1.94

Lr3+ + 3 e⇌ Lr
-1.96

Eu3+ + 3 e⇌ Eu
-1.991

Er2+ + 2 e⇌ Er
-2.0

Pr2+ + 2 e⇌ Pr
-2.0

Pu3+ + 3 e⇌ Pu
-2.031

Cm3+ + 3 e⇌ Cm
-2.04

Am3+ + 3 e⇌ Am
-2.048

AlF63- + 3 e⇌ Al + 6 F
-2.069

Sc3+ + 3 e⇌ Sc
-2.077

Ho2+ + 2 e⇌ Ho
-2.1

Nd2+ + 2 e⇌ Nd
-2.1

Cf2+ + 2 e⇌ Cf
-2.12

Yb3+ + 3 e⇌ Yb
-2.19

Ac3+ + 3 e⇌ Ac
-2.2

Dy2+ + 2 e⇌ Dy
-2.2

Tm3+ + e⇌ Tm2+
-2.2

Pm2+ + 2 e⇌ Pm
-2.2

Es2+ + 2 e⇌ Es
-2.23

H2 + 2 e⇌ 2 H
-2.23

Gd3+ + 3 e⇌ Gd
-2.279

Tb3+ + 3 e⇌ Tb
-2.28

Lu3+ + 3 e⇌ Lu
-2.28

Dy3+ + 3 e⇌ Dy
-2.295

Am3+ + e⇌ Am2+
-2.3

Fm2+ + 2 e⇌ Fm
-2.3

Pm3+ + 3 e⇌ Pm
-2.3

Sm3+ + 3 e⇌ Sm
-2.304

Al(OH)3 + 3 e⇌ Al + 3 OH
-2.31

Tm3+ + 3 e⇌ Tm
-2.319

Nd3+ + 3 e⇌ Nd
-2.323

Al(OH) + 3 e⇌ Al + 4 OH
-2.328

H2AlO3 + H2O + 3 e⇌ Al + 4 OH
-2.33

Ho3+ + 3 e⇌ Ho
-2.33

Er3+ + 3 e⇌ Er
-2.331

Ce3+ + 3 e⇌ Ce
-2.336

Pr3+ + 3 e⇌ Pr
-2.353

ZrO(OH)2 + H2O + 4 e⇌ Zr + 4 OH
-2.36

Mg2+ + 2 e⇌ Mg
-2.372

Y3+ + 3 e⇌ Y
-2.372

La3+ + 3 – La
-2.379

Tm2+ + 2 e⇌ Tm
-2.4

Md2+ + 2 e⇌ Md
-2.4

Th(OH)4 + 4 e⇌ Th + 4 OH
-2.48

HfO(OH)2 + H2O + 4 e⇌ Hf + 4 OH
-2.5

No2+ + 2 e⇌ No
-2.5

Dy3+ + e⇌ Dy2+
-2.6

Pm3+ + e⇌ Pm2+
-2.6

Be2O32- + 3 H2O + 4 e⇌ 2 Be + 6 OH
-2.63

Sm2+ + 2 e⇌ Sm
-2.68

Mg(OH)2 + 2 e⇌ Mg + 2 OH
-2.69

Nd3+ + e⇌ Nd2+
-2.7

Mg+ + e⇌ Mg
-2.7

Na+ + e⇌ Na
-2.71

Yb2+ + 2 e⇌ Yb
-2.76

Bk3+ + e⇌ Bk2+
-2.8

Ho3+ + e⇌ Ho2+
-2.8

Ra2+ + 2 e⇌ Ra
-2.8

Eu2+ + 2 e⇌ Eu
-2.812

Ca2+ + 2 e⇌ Ca
-2.868

Sr(OH)2 + 2 e⇌ Sr + 2 OH
-2.88

Sr2+ + 2 e⇌ Sr
-2.89

Fr+ + e⇌ Fr
-2.9

La(OH)3 + 3 e⇌ La + 3 OH
-2.9

Ba2+ + 2 e⇌ Ba
-2.912

K+ + e⇌ K
-2.931

Rb+ + e⇌ Rb
-2.98

Ba(OH)2 + 2 e⇌ Ba + 2 OH
-2.99

Er3+ + e⇌ Er2+
-3.0

Ca(OH)2 + 2 e⇌ Ca + 2 OH
-3.02

Cs+ + e⇌ Cs
-3.026

Li+ + e⇌ Li
-3.0401

3 N2 + 2 H+ + 2 e⇌ 2 HN3
-3.09

Pr3+ + e⇌ Pr2+
-3.1

Ca+ + e⇌ Ca
-3.8

Sr+ + e⇌ Sr
-4.1