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Standard electrode potential (data page)

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The data below tabulates standard electrode potentials (E°), in volts relative to the standard hydrogen electrode (SHE), at:

Variations from these ideal conditions affect measured voltage via the Nernst equation.

Relationships between Standard Electrode Potentials and Gibbs Free Energy

[edit]

Electrode potentials of successive elementary half-reactions cannot be directly added. However, the corresponding Gibbs free energy changes (∆G°) can be added. Those free energy changes satisfy

G° = –zFE°,

where z electrons are transferred, and the Faraday constant F is the conversion factor describing coulombs transferred per mole electrons. F = 96 485 C/mol. For example, from

Fe2+(aq) + 2 e ⇌ Fe(s) (−0.44 V),

the energy to form one neutral atom of Fe(s) from one Fe2+(aq) ion and two electrons is 2 × 0.44 eV = 0.88 eV, or 84.907 kJ/(mol e). That value is also the standard formation energy (∆fG°) for an Fe2+(aq) ion, since e and Fe(s) both have zero formation energy.

Data from different sources may cause inconsistencies. For example:

Ti3+(aq) + eTi2+(aq) E3→2 = -0.37 V
Ti2+(aq) + 2 e ⇌ Ti(s) E2→0 = -1.63 V
Ti3+(aq) + 3 e ⇌ Ti(s) E3→0 = -1.37 V

We can derive an equation relating these electrode potentials:

3 x E3→0 = 1 x E3→2 + 2 x E2→0

This is derived from...

G3→0 = ∆G3→2 + ∆G2→0

...and because ∆G° = –zFE°

Considering the measured values for E3→0, E3→2 and E2→0...

3 x E3→0 = 3 x (-1.37) = -4.11 V
...but 1 x E3→2 + 2 x E2→0 = 1 x (-0.37) + 2 x (-1.63) = -3.63 V ≠ -4.11 V ...

...so there are discrepancies between some of the cited values. A Frost diagram will show the discrepancies clearly.


Table of standard electrode potentials

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Legend: (s) – solid; (l) – liquid; (g) – gas; (aq) – aqueous (default for all charged species); (Hg) – amalgam; bold – water electrolysis equations.

Element Half-reaction
(volt)
Electrons
transferred
Reference
Oxidant Reductant
Sr Sr+ + e Sr(s) −4.101 1 [1]
Ca Ca+ + e Ca(s) −3.8 1 [1]
Th Th4+ + e Th3+ −3.6 1 [2]
Pr Pr3+ + e Pr2+ −3.1 1 Estimated[3]
N 3 N2(g) + 2 H+ + 2 e 2 HN3(aq) −3.09 2 [4][5]
Li Li+ + e Li(s) −3.0401 1 [5][6]:153
N N2(g) + 4 H2O + 2 e 2 NH2OH(aq) + 2 OH −3.04 2 [4]
Cs Cs+ + e Cs(s) −3.026 1 [5]
Ca Ca(OH)2 + 2 e Ca(s) + 2 OH −3.02 2 [1]
Er Er3+ + e Er2+ −3 1 [1]
Ba Ba(OH)2 + 2 e Ba(s) + 2 OH −2.99 2 [1]
Rb Rb+ + e Rb(s) −2.98 1 [5]
K K+ + e K(s) −2.931 1 [5]
Ba Ba2+ + 2 e Ba(s) −2.912 2 [5]
La La(OH)3(s) + 3 e La(s) + 3 OH −2.9 3 [5]
Fr Fr+ + e Fr(s) −2.9 1 [1]
Sr Sr2+ + 2 e Sr(s) −2.899 2 [5]
Sr Sr(OH)2 + 2 e Sr(s) + 2 OH −2.88 2 [1]
Ca Ca2+ + 2 e Ca(s) −2.868 2 [5][6]:153
Li Li+ + C6(s) + e LiC6(s) −2.84 1 [5]
Eu Eu2+ + 2 e Eu(s) −2.812 2 [5]
Ra Ra2+ + 2 e Ra(s) −2.8 2 [5]
Ho Ho3+ + e Ho2+ −2.8 1 [1]
Bk Bk3+ + e Bk2+ −2.8 1 [1]
Yb Yb2+ + 2 e Yb(s) −2.76 2 [1]
Na Na+ + e Na(s) −2.71 1 [5][7]
Mg Mg+ + e Mg(s) −2.7 1 [1]
Nd Nd3+ + e Nd2+ −2.7 1 [1]
Mg Mg(OH)2 + 2 e Mg(s) + 2 OH −2.69 2 [1]
Sm Sm2+ + 2 e Sm(s) −2.68 2 [1]
Be Be2O32− + 3 H2O + 4 e 2 Be(s) + 6 OH −2.63 4 [1]
Pm Pm3+ + e Pm2+ −2.6 1 [1]
Dy Dy3+ + e Dy2+ −2.6 1 [1]
No No2+ + 2 e No(s) −2.5 2 [1]
Hf HfO(OH)2 + H2O + 4 e Hf(s) + 4 OH −2.5 4 [1]
Th Th(OH)4 + 4 e Th(s) + 4 OH −2.48 4 [1]
Md Md2+ + 2 e Md(s) −2.4 2 [1]
Tm Tm2+ + 2 e Tm(s) −2.4 2 [1]
La La3+ + 3 e La(s) −2.379 3 [5]
Y Y3+ + 3 e Y(s) −2.372 3 [5]
Mg Mg2+ + 2 e Mg(s) −2.372 2 [5]
Sc ScF3(aq) + 3 H+ + 3 e Sc(s) + 3 HF(aq) −2.37 3 [6]:792
Zr ZrO(OH)2(s) + H2O + 4 e Zr(s) + 4 OH −2.36 4 [5]
Pr Pr3+ + 3 e Pr(s) −2.353 3 [1]
Ce Ce3+ + 3 e Ce(s) −2.336 3 [1]
Er Er3+ + 3 e Er(s) −2.331 3 [1]
Ho Ho3+ + 3 e Ho(s) −2.33 3 [1]
Al H2AlO3 + H2O + 3 e Al(s) + 4 OH −2.33 3 [1]
Nd Nd3+ + 3 e Nd(s) −2.323 3 [1]
Tm Tm3+ + 3 e Tm(s) −2.319 3 [1]
Al Al(OH)3(s) + 3 e Al(s) + 3 OH −2.31 3 [8]
Sm Sm3+ + 3 e Sm(s) −2.304 3 [1]
Fm Fm2+ + 2 e Fm(s) −2.3 2 [1]
Am Am3+ + e Am2+ −2.3 1 [1]
Dy Dy3+ + 3 e Dy(s) −2.295 3 [1]
Lu Lu3+ + 3 e Lu(s) −2.28 3 [1]
Sc ScF2+ + 2 H+ + 3 e Sc(s) + 2 HF(l) −2.28 3 [6]:792
Tb Tb3+ + 3 e Tb(s) −2.28 3 [1]
Gd Gd3+ + 3 e Gd(s) −2.279 3 [1]
H H2(g) + 2 e 2 H −2.23 2 [1]
Es Es2+ + 2 e Es(s) −2.23 2 [1]
Pm Pm2+ + 2 e Pm(s) −2.2 2 [1]
Tm Tm3+ + e Tm2+ −2.2 1 [1]
Dy Dy2+ + 2 e Dy(s) −2.2 2 [1]
Ac Ac3+ + 3 e Ac(s) −2.2 3 [1]
Yb Yb3+ + 3 e Yb(s) −2.19 3 [1]
Cf Cf2+ + 2 e Cf(s) −2.12 2 [1]
Nd Nd2+ + 2 e Nd(s) −2.1 2 [1]
Ho Ho2+ + 2 e Ho(s) −2.1 2 [1]
Sc Sc3+ + 3 e Sc(s) −2.077 3 [9]
Al AlF63− + 3 e Al(s) + 6 F −2.069 3 [1]
Cm Cm3+ + 3 e Cm(s) −2.04 3 [1]
Pu Pu3+ + 3 e Pu(s) −2.031 3 [1]
Pr Pr2+ + 2 e Pr(s) −2 2 [1]
Er Er2+ + 2 e Er(s) −2 2 [1]
Eu Eu3+ + 3 e Eu(s) −1.991 3 [1]
Lr Lr3+ + 3 e Lr(s) −1.96 3 [1]
Cf Cf3+ + 3 e Cf(s) −1.94 3 [1]
Es Es3+ + 3 e Es(s) −1.91 3 [1]
Pa Pa4+ + e Pa3+ −1.9 1 [1]
Am Am2+ + 2 e Am(s) −1.9 2 [1]
Th Th4+ + 4 e Th(s) −1.899 4 [1]
Fm Fm3+ + 3 e Fm(s) −1.89 3 [1]
N N2(g) + 2 H2O + 4 H+ + 2 e 2 NH3OH+ −1.87 2 [6]:789
Np Np3+ + 3 e Np(s) −1.856 3 [1]
Be Be2+ + 2 e Be(s) −1.847 2 [1]
P H2PO2 + e P(s) + 2 OH −1.82 1 [1]
U U3+ + 3 e U(s) −1.798 3 [1]
Sr Sr2+ + 2 e Sr(Hg) −1.793 2 [1]
B H2BO3 + H2O + 3 e B(s) + 4 OH −1.79 3 [1]
Th ThO2 + 4 H+ + 4 e Th(s) + 2 H2O −1.789 4 [1]
Hf HfO2+ + 2 H+ + 4 e Hf(s) + H2O −1.724 4 [1]
P HPO32− + 2 H2O + 3 e P(s) + 5 OH −1.71 3 [1]
Si SiO32− + 3 H2O + 4 e Si(s) + 6 OH −1.697 4 [1]
Al Al3+ + 3 e Al(s) −1.662 3 [1]
Ti Ti2+ + 2 e Ti(s) −1.63 2 [7]
Zr ZrO2(s) + 4 H+ + 4 e Zr(s) + 2 H2O −1.553 4 [10]
Zr Zr4+ + 4 e Zr(s) −1.45 4 [10]
Ti Ti3+ + 3 e Ti(s) −1.37 3 [11]
Ti TiO(s) + 2 H+ + 2 e Ti(s) + H2O −1.31 2 [6]:792
B [B(OH)4] + 4 H2O + 8 e BH4 + 8 OH −1.24 8 [6]:788
Ti Ti2O3(s) + 2 H+ + 2 e 2 TiO(s) + H2O −1.23 2 [6]:792
Ga [Ga(OH)4] + 3 e Ga(s) + 3 OH −1.22 3 [6]:788
Zn [Zn(OH)4]2−) + 2 e Zn(s) + 4 OH −1.199 2 [10]
Mn Mn2+ + 2 e Mn(s) −1.185 2 [10]
Fe [Fe(CN)6]4− + 6 H+ + 2 e Fe(s) + 6 HCN(aq) −1.16 2 [12]
C C(s) + 3 H2O + 2 e CH3OH(l) + 2 OH −1.148 2 [6]:788
Cr [Cr(CN)6]3− + e [Cr(CN)6]4− −1.143 1 [6]:793
Te Te(s) + 2 e Te2− −1.143 2 [13]
V V2+ + 2 e V(s) −1.13 2 [13]
Nb Nb3+ + 3 e Nb(s) −1.099 3 [8]
Sn Sn(s) + 4 H+ + 4 e SnH4(g) −1.07 4
Po Po(s) + 2 e Po2− −1.021 2 [14]
Cr [Cr(edta)(H2O)] + e [Cr(edta)(H2O)]2− −0.99 1 [6]:793
P 2 H3PO4(aq) + 2 H+ + 2 e (H2PO3)2(aq) + H2O −0.933 2 [6]:789
C CO32− + 3 H+ + 2 e HCO2 + H2O −0.93 2 [6]:788
Ti TiO2+ + 2 H+ + 4 e Ti(s) + H2O −0.93 4
Si SiO2(quartz) + 4 H+ + 4 e Si(s) + 2 H2O −0.909 4 [6]:788
Cr Cr2+ + 2 e Cr(s) −0.9 2 [6]:793
B B(OH)3(aq) + 3 H+ + 3 e B(s) + 3 H2O −0.89 3 [6]:788
Fe Fe(OH)2(s) + 2 e Fe(s) + 2 OH −0.89 2 [12]
Fe Fe2O3(s) + 3 H2O + 2 e 2 Fe(OH)2(s) + 2 OH −0.86 2 [12]
H 2 H2O + 2 e H2(g) + 2 OH −0.8277 2 [10]
Bi Bi(s) + 3 H+ + 3 e BiH3 −0.8 3 [10]
Zn Zn2+ + 2 e Zn(Hg) −0.7628 2 [10]
Zn Zn2+ + 2 e Zn(s) −0.7618 2 [10]
Ta Ta2O5(s) + 10 H+ + 10 e 2 Ta(s) + 5 H2O −0.75 10
Cr Cr3+ + 3 e Cr(s) −0.74 3 [7]
Te 2 Te(s) + 2 e Te22− −0.74 2 [6]:790
Ni Ni(OH)2(s) + 2 e Ni(s) + 2 OH −0.72 2 [1]
Nb Nb2O5(s) + 10 H+ + 10 e 2 Nb(s) + 5 H2O −0.7 10 [6]:793
Ag Ag2S(s) + 2 e 2 Ag(s) + S2− −0.69 2
Te Te22− + 4 H+ + 2 e 2 H2Te(g) −0.64 2 [6]:790
Sb [Sb(OH)4] + 3 e Sb(s) + 4 OH −0.639 3 [6]:789
Au [Au(CN)2] + e Au(s) + 2 CN −0.6 1
Ta Ta3+ + 3 e Ta(s) −0.6 3 [8]
Pb PbO(s) + H2O + 2 e Pb(s) + 2 OH −0.580 2 [8]
Ti 2 TiO2(s) + 2 H+ + 2 e Ti2O3(s) + H2O −0.56 2 [6]:792
Ga Ga3+ + 3 e Ga(s) −0.549 3 [8]
U U4+ + e U3+ −0.52 1 [15]
P H3PO2(aq) + H+ + e P(white)[note 1] + 2 H2O −0.508 1 [10]
P H3PO3(aq) + 2 H+ + 2 e H3PO2(aq) + H2O −0.499 2 [10]
Ni NiO2(s) + 2 H2O + 2 e Ni(OH)2(s) + 2 OH −0.49 2 [1]
Sb [Sb(OH)6] + 2 e [Sb(OH)4] + 2 OH −0.465 2 [6]:789
P H3PO3(aq) + 3 H+ + 3 e P(red)[note 1] + 3 H2O −0.454 3 [10]
Bi Bi2O3(s) + 3 H2O + 6 e Bi(s) + 6 OH −0.452 6 [6]:789
Ta TaF72− + 7 H+ + 5 e Ta(s) + 7 HF(l) −0.45 5 [6]:793
In In3+ + 2 e In+ −0.444 2 [6]:788
Cu [Cu(CN)2] + e Cu(s) + 2 CN −0.44 1 [13]
Fe Fe2+ + 2 e Fe(s) −0.44 2 [7]
C 2 CO2(g) + 2 H+ + 2 e HOOCCOOH(aq) −0.43 2
Cr Cr3+ + e Cr2+ −0.407 1 [8]
Cd Cd2+ + 2 e Cd(s) −0.4 2 [8]
Ti Ti3+ + e Ti2+ −0.37 1 [6]:792
Cu Cu2O(s) + H2O + 2 e 2 Cu(s) + 2 OH −0.36 2 [10]
Pb PbSO4(s) + 2 e Pb(s) + SO42− −0.3588 2 [10]
Pb PbSO4(s) + 2 e Pb(Hg) + SO42− −0.3505 2 [10]
Eu Eu3+ + e Eu2+ −0.35 1 [15]
In In3+ + 3 e In(s) −0.34 3 [13]
Tl Tl+ + e Tl(s) −0.34 1 [13]
Ge Ge(s) + 4 H+ + 4 e GeH4(g) −0.29 4
Co Co2+ + 2 e Co(s) −0.28 2 [10]
P H3PO4(aq) + 2 H+ + 2 e H3PO3(aq) + H2O −0.276 2 [10]
N N2(g) + 8 H+ + 6 e 2 NH4+ 0.27 6 [16]
V V3+ + e V2+ −0.26 1 [7]
Ni Ni2+ + 2 e Ni(s) −0.257 2 [8]
S 2 HSO4 + 2 H+ + 2 e S2O62− + 2 H2O −0.253 2 [6]:790
As As(s) + 3 H+ + 3 e AsH3(g) −0.23 3 [13]
N N2(g) + 5 H+ + 4 e N2H5+ −0.23 4 [6]:789
Ga Ga+ + e Ga(s) −0.2 1 [8]
Ag AgI(s) + e Ag(s) + I −0.15224 1 [10]
Ge GeO2(s) + 4 H+ + 4 e Ge(s) + 2 H2O −0.15 4 [16]
Mo MoO2(s) + 4 H+ + 4 e Mo(s) + 2 H2O −0.15 4
Si Si(s) + 4 H+ + 4 e SiH4(g) −0.14 4
Sn Sn2+ + 2 e Sn(s) −0.13 2
O O2(g) + H+ + e HO(aq) −0.13 1
In In+ + e In(s) −0.126 1 [6]:788
Pb Pb2+ + 2 e Pb(s) −0.126 2 [7]
W WO2(s) + 4 H+ + 4 e W(s) + 2 H2O −0.12 4
Ge GeO2(s) + 2 H+ + 2 e GeO(s) + H2O −0.118 2 [8]
P P(red) + 3 H+ + 3 e PH3(g) −0.111 3 [10]
C CO2(g) + 2 H+ + 2 e HCOOH(aq) −0.11 2
Se Se(s) + 2 H+ + 2 e H2Se(g) −0.11 2 [6]:790
C CO2(g) + 2 H+ + 2 e CO(g) + H2O −0.11 2
Sn α-SnO(s) + 2 H+ + 2 e Sn(s) + H2O −0.104 2 [6]:788
Cu [Cu(NH3)2]+ + e Cu(s) + 2 NH3(aq) −0.1 1 [13]
Nb Nb2O5(s) + 10 H+ + 4 e 2 Nb3+ + 5 H2O −0.1 4 [6]:793
W WO3(aq) + 6 H+ + 6 e W(s) + 3 H2O −0.09 6 [13]
Sn SnO2(s) + 2 H+ + 2 e α-SnO(s) + H2O −0.088 2 [6]:788
Fe Fe3O4(s) + 8 H+ + 8 e 3 Fe(s) + 4 H2O −0.085 8 [17]
V VOH2+ + H+ + e V2+ + H2O −0.082 1 [6]:793
P P(white) + 3 H+ + 3 e PH3(g) −0.063 3 [10]
N N2O(g) + H2O + 6 H+ + 4 e 2 NH3OH+ −0.05 4 [6]:789
Fe Fe3+ + 3 e Fe(s) −0.04 3 [12]
C HCOOH(aq) + 2 H+ + 2 e HCHO(aq) + H2O −0.034 2 [6]:788
H 2 H+ + 2 e H2(g) 0 2
Ag AgBr(s) + e Ag(s) + Br 0.07133 1 [10]
S S4O62− + 2 e 2 S2O32− 0.08 2
N N2(g) + 2 H2O + 6 H+ + 6 e 2 NH4OH(aq) 0.092 6
Hg HgO(s) + H2O + 2 e Hg(l) + 2 OH 0.0977 2
Cu [Cu(NH3)4]2+ + e [Cu(NH3)2]+ + 2 NH3(aq) 0.1 1 [13]
Ru [Ru(NH3)6]3+ + e [Ru(NH3)6]2+ 0.1 1 [15]
N N2H4(aq) + 4 H2O + 2 e 2 NH4+ + 4 OH 0.11 2 [4]
Mo H2MoO4(aq) + 6 H+ + 6 e Mo(s) + 4 H2O 0.11 6
Ge Ge4+ + 4 e Ge(s) 0.12 4
C C(s) + 4 H+ + 4 e CH4(g) 0.13 4 [13]
C HCHO(aq) + 2 H+ + 2 e CH3OH(aq) 0.13 2
S S(s) + 2 H+ + 2 e H2S(g) 0.144 2 [6]:790
Sb Sb2O3(s) + 6 H+ + 6 e 2 Sb(s) + 3 H2O 0.15 6 [6]:789
Sn Sn4+ + 2 e Sn2+ 0.151 2 [8]
S HSO4 + 3 H+ + 2 e SO2(aq) + 2 H2O 0.158 2 [6]:790
Cu Cu2+ + e Cu+ 0.159 1 [13]
U UO22+ + e UO2+ 0.163 1 [15]
S SO42− + 4 H+ + 2 e SO2(aq) + 2 H2O 0.17 2
Ti TiO2+ + 2 H+ + e Ti3+ + H2O 0.19 1
Sb SbO+ + 2 H+ + 3 e Sb(s) + H2O 0.2 3
Fe 3 Fe2O3(s) + 2 H+ + 2 e 2 Fe3O4(s) + H2O 0.22 2 [18]:p.100
Ag AgCl(s) + e Ag(s) + Cl 0.22233 1 [10]
As H3AsO3(aq) + 3 H+ + 3 e As(s) + 3 H2O 0.24 3 [6]:789
Ru Ru3+ + e Ru2+ 0.249 1 [19]
Pb PbO2(s) + H2O + 2 e α-PbO(s) + 2 OH 0.254 2 [6]:788
Ge GeO(s) + 2 H+ + 2 e Ge(s) + H2O 0.26 2
Hg Hg2Cl2(s) + 2 e 2 Hg(l) + 2 Cl 0.27 2 [16]
U UO2+ + 4 H+ + e U4+ + 2 H2O 0.273 1 [15]
At At + e At 0.3 1 [20]
Bi Bi3+ + 3 e Bi(s) 0.308 3 [10]
C 2 HCNO + 2 H+ + 2 e (CN)2 + 2 H2O 0.330 2 [8]
Cu Cu2+ + 2 e Cu(s) 0.337 2 [13]
V VO2+ + 2 H+ + e V3+ + H2O 0.337 1 [6]:793
Sb Sb2O4(s) + 2 H+ + 2 e Sb2O3(s) + H2O 0.342 2 [6]:789
At At+ + 2 e At 0.36 2 [21]
Fe [Fe(CN)6]3− + e [Fe(CN)6]4− 0.3704 1 [22]
C (CN)2 + 2 H+ + 2 e 2 HCN 0.373 2 [8]
P (H2PO3)2(aq) + 2 H+ + 2 e 2 H3PO3 0.38 2 [6]:789
S 2 SO2(aq) + 2 H+ + 2 e S2O32− + H2O 0.4 2 [6]:790
O O2(g) + 2 H2O + 4 e 4 OH 0.401 4 [7]
Mo H2MoO4 + 6 H+ + 3 e Mo3+ + 4 H2O 0.43 3
Ru Ru2+ + 2 e Ru(s) 0.455 2 [19]
V VO(OH)+ + 2 H+ + e VOH2+ + H2O 0.481 1 [6]:793
Re Re3+ + 3 e Re(s) 0.5 3 [3]
C CH3OH(aq) + 2 H+ + 2 e CH4(g) + H2O 0.5 2
S SO2(aq) + 4 H+ + 4 e S(s) + 2 H2O 0.5 4 [6]:790
S 4 SO2(aq) + 4 H+ + 6 e S4O62− + 2 H2O 0.51 6 [16]
Cu Cu+ + e Cu(s) 0.52 1 [13]
C CO(g) + 2 H+ + 2 e C(s) + H2O 0.52 2 [6]:788
I I3 + 2 e 3 I 0.53 2 [7]
Te TeO2(s) + 4 H+ + 4 e Te(s) + 2 H2O 0.53 4 [6]:790
Cu Cu2+ + Cl + e CuCl(s) 0.54 1 [16]
I I2(s) + 2 e 2 I 0.54 2 [7]
Au AuI4 + 3 e Au(s) + 4 I 0.56 3
As H3AsO4(aq) + 2 H+ + 2 e H3AsO3(aq) + H2O 0.56 2 [6]:789
S S2O62− + 4 H+ + 2 e 2 H2SO3 0.569 2 [6]:790
Au AuI2 + e Au(s) + 2 I 0.58 1
Mn MnO4 + 2 H2O + 3 e MnO2(s) + 4 OH 0.595 3 [1]
S S2O32− + 6 H+ + 4 e 2 S(s) + 3 H2O 0.6 4 [6]:790
Fe Fc+ + e Fc(s) 0.63 1 Substantial literature variation[23]
Mo H2MoO4(aq) + 2 H+ + 2 e MoO2(s) + 2 H2O 0.65 2
N HN3(aq) + 11 H+ + 8 e 3 NH4+ 0.69 8 [16]
O O2(g) + 2 H+ + 2 e H2O2(aq) 0.695 2 [8]
Sb Sb2O5(s) + 4 H+ + 4 e Sb2O3(s) + 2 H2O 0.699 4 [6]:789
C + 2 H+ + 2 e 0.6992 2 [10]
V H2V10O284− + 24 H+ + 10 e 10 VO(OH)+ + 8 H2O 0.723 10 [6]:793
Pt PtCl62− + 2 e PtCl42− + 2 Cl 0.726 2 [15]
Fe Fe2O3(s) + 6 H+ + 2 e 2 Fe2+ + 3 H2O 0.728 2 [18]:p.100
Se H2SeO3(aq) + 4 H+ + 4 e Se(s) + 3 H2O 0.74 4 [8]
At AtO+ + 2 H+ + 2 e At+ + H2O 0.74 2 [21]
Tl Tl3+ + 3 e Tl(s) 0.741 3 [8]
No No3+ + e No2+ 0.75 1 [24]
Pt PtCl42− + 2 e Pt(s) + 4 Cl 0.758 2 [15]
Br BrO + H2O + 2 e Br + 2 OH 0.76 2 [6]:791
Po Po4+ + 4 e Po(s) 0.76 4 [8]
S (SCN)2 + 2 e 2 SCN 0.769 2 [25][8]
Fe Fe3+ + e Fe2+ 0.771 1 [8]
Hg Hg22+ + 2 e 2 Hg(l) 0.7973 2 [8]
Ag Ag+ + e Ag(s) 0.7996 1 [10]
N 2 NO3 + 4 H+ + 2 e N2O4(g) + 2 H2O 0.803 2 [6]:789
Fe 2 FeO42− + 5 H2O + 6 e Fe2O3(s) + 10 OH 0.81 6 [12]
Au AuBr4 + 3 e Au(s) + 4 Br 0.85 3
Hg Hg2+ + 2 e Hg(l) 0.85 2
Ir IrCl62− + e IrCl63− 0.87 1 [6]:153
Mn MnO4 + H+ + e HMnO4 0.9 1
Po Po4+ + 2 e Po2+ 0.9 2 [8]
Hg 2 Hg2+ + 2 e Hg22+ 0.91 2 [13]
Pd Pd2+ + 2 e Pd(s) 0.915 2 [15]
Au AuCl4 + 3 e Au(s) + 4 Cl 0.93 3
N NO3 + 3 H+ + 2 e HNO2(aq) 0.94 2 [6]:789
Mn MnO2(s) + 4 H+ + e Mn3+ + 2 H2O 0.95 1
N NO3 + 4 H+ + 3 e NO(g) + 2 H2O 0.958 3 [7]
Au AuBr2 + e Au(s) + 2 Br 0.96 1
Fe Fe3O4(s) + 8 H+ + 2 e 3 Fe2+ + 4 H2O 0.98 2 [18]:p.100
Xe HXeO63− + 2 H2O + 2 e HXeO4 + 4 OH 0.99 2 [6]:792[26]
N HNO2(aq) + H+ + e NO(g) + H2O 0.996 1 [6]:789
At HAtO + H+ + e At + H2O 1.0 1 [20]
V VO2+ + 2 H+ + e VO2+ + H2O 1 1 [27]
Te H6TeO6(aq) + 2 H+ + 2 e TeO2(s) + 4 H2O 1.02 2 [27]
N NO2(g) + 2 H+ + 2 e NO(g) + H2O 1.03 2 [16]
Br Br3 + 2 e 3 Br 1.05 2 [16]
Sb Sb2O5(s) + 2 H+ + 2 e Sb2O4(s) + H2O 1.055 2 [6]:789
I ICl2 + e 2 Cl + I(s) 1.06 1 [16]
Br Br2(l) + 2 e 2 Br 1.066 2 [10]
N N2O4(g) + 2 H+ + 2 e 2 HNO2 1.07 2 [6]:789
Br Br2(aq) + 2 e 2 Br 1.0873 2 [10]
Ru RuO2 + 4 H+ + 2 e Ru2+ + 2 H2O 1.120 2 [19]
Cu Cu2+ + 2 CN + e Cu(CN)2 1.12 1 [13]
I IO3 + 5 H+ + 4 e HIO(aq) + 2 H2O 1.13 4 [6]:791
O H2O2(aq) + H+ + e H2O + HO• 1.14 1 [6]:790
Au AuCl2 + e Au(s) + 2 Cl 1.15 1
Se HSeO4 + 3 H+ + 2 e H2SeO3(aq) + H2O 1.15 2 [6]:790
Ag Ag2O(s) + 2 H+ + 2 e 2 Ag(s) + H2O 1.17 2
Cl ClO3 + 2 H+ + e ClO2(g) + H2O 1.175 1 [6]:791
Xe HXeO63− + 5 H2O + 8 e Xe(g) + 11 OH 1.18 8 [26]
Pt Pt2+ + 2 e Pt(s) 1.188 2 [15]
Cl ClO2(g) + H+ + e HClO2(aq) 1.19 1 [28]
I 2 IO3 + 12 H+ + 10 e I2(s) + 6 H2O 1.2 10 [16]
Mn MnO2(s) + 4 H+ + 2 e Mn2+ + 2 H2O 1.224 2 [10]
O O2(g) + 4 H+ + 4 e 2 H2O 1.229 4 [7]
N N2H5+ + 3 H+ + 2 e 2 NH4+ 1.28 2 [6]:789
Cl ClO4 + 2 H+ + 2 e ClO3 + H2O 1.23 2 [29]
Ru [Ru(bipy)3]3+ + e [Ru(bipy)3]2+ 1.24 1 [1]
Xe HXeO4 + 3 H2O + 6 e Xe(g) + 7 OH 1.24 6 [6]:792[26]
N 2 NO3 + 12 H+ + 10 e N2(g) + 6 H2O 1.25 10 [6]:789
Tl Tl3+ + 2 e Tl+ 1.25 2 [6]:788
N 2 HNO2(aq) + 4 H+ + 4 e N2O(g) + 3 H2O 1.297 4 [6]:789
Cr Cr2O72− + 14 H+ + 6 e 2 Cr3+ + 7 H2O 1.33 6 [4]:1005
N NH3OH+ + 2 H+ + 2 e NH4+ + H2O 1.35 2 [6]:789
Cl Cl2(g) + 2 e 2 Cl 1.36 2 [7]
Ru RuO4 + 8 H+ + 5 e Ru2+ + 4 H2O 1.368 5 [19]
Ru RuO4 + 4 H+ + 4 e RuO2 + 2 H2O 1.387 4 [19]
Co CoO2(s) + 4 H+ + e Co3+ + 2 H2O 1.42 1
N 2 NH3OH+ + H+ + 2 e N2H5+ + 2 H2O 1.42 2 [4]
I 2 HIO(aq) + 2 H+ + 2 e I2(s) + 2 H2O 1.44 2 [6]:791
Br BrO3 + 5 H+ + 4 e HBrO(aq) + 2 H2O 1.447 4 [6]:791
Pb βPbO2(s) + 4 H+ + 2 e Pb2+ + 2 H2O 1.46 2 [13]
Pb αPbO2(s) + 4 H+ + 2 e Pb2+ + 2 H2O 1.468 2 [13]
Br 2 BrO3 + 12 H+ + 10 e Br2(l) + 6 H2O 1.48 10
At HAtO3 + 4 H+ + 4 e HAtO + 2 H2O 1.5 4 [20]
Mn MnO4 + 8 H+ + 5 e Mn2+ + 4 H2O 1.51 5 [16]
O HO2 + H+ + e H2O2(aq) 1.51 1
Au Au3+ + 3 e Au(s) 1.52 3
Ru RuO42− + 8 H+ + 4 e Ru2+ + 4 H2O 1.563 4 [19]
N 2 NO(g) + 2 H+ + 2 e N2O(g) + H2O 1.59 2 [6]:789
Ni NiO2(s) + 2 H+ + 2 e Ni2+ + 2 OH 1.59 2
Ce Ce4+ + e Ce3+ 1.61 1
Cl 2 HClO(aq) + 2 H+ + 2 e Cl2(g) + 2 H2O 1.63 2 [28]
I IO4 + 2 H+ + 2 e IO3 + H2O 1.64 2 [29]
Ag Ag2O3(s) + 6 H+ + 4 e 2 Ag+ + 3 H2O 1.67 4
Cl HClO2(aq) + 2 H+ + 2 e HClO(aq) + H2O 1.67 2 [28]
Pb Pb4+ + 2 e Pb2+ 1.69 2 [13]
Mn MnO4 + 4 H+ + 3 e MnO2(s) + 2 H2O 1.7 3 [16]
Br BrO4 + 2 H+ + 2 e BrO3 + H2O 1.74 2 [29]
Ag AgO(s) + 2 H+ + e Ag+ + H2O 1.77 1
N N2O(g) + 2 H+ + 2 e N2(g) + H2O 1.77 2 [6]:789
O H2O2(aq) + 2 H+ + 2 e 2 H2O 1.78 2 [28]
Au Au+ + e Au(s) 1.83 1 [13]
Co Co3+ + e Co2+ 1.92 1 [8]
Ag Ag2+ + e Ag+ 1.98 1 [13]
O S2O82− + 2 e 2 SO42− 2.01 2 [10]
O O3(g) + 2 H+ + 2 e O2(g) + H2O 2.075 2 [15]
Mn HMnO4 + 3 H+ + 2 e MnO2(s) + 2 H2O 2.09 2
Xe XeO3(aq) + 6 H+ + 6 e Xe(g) + 3 H2O 2.12 6 [6]:792[26]
Xe H4XeO6(aq) + 8 H+ + 8 e Xe(g) + 6 H2O 2.18 8 [6]:792[26]
Fe FeO42− + 8 H+ + 3 e Fe3+ + 4 H2O 2.2 3 [30]
Xe XeF2(aq) + 2 H+ + 2 e Xe(g) + 2 HF(aq) 2.32 2 [26][28]
O HO• + H+ + e H2O 2.38 1 [6]:790
Xe H4XeO6(aq) + 2 H+ + 2 e XeO3(aq) + 3 H2O 2.42 2 [26][6]:792
F F2(g) + 2 e 2 F 2.87 2 [6]:153[7][13]
Cm Cm2+ + e Cm3+ 3.0 1 Estimated[3]
F F2(g) + 2 H+ + 2 e 2 HF(aq) 3.077 2 [3]
Tb Tb4+ + e Tb3+ 3.1 1 Estimated[3]
Pr Pr4+ + e Pr3+ 3.2 1 Estimated[3]
Kr KrF2(aq) + 2 e Kr(g) + 2 F 3.27 2 Estimated[31]

See also

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Notes

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  1. 1 2 Not specified in the indicated reference, but assumed due to the difference between the value −0.454 and that computed by (2×(−0.499) + (−0.508))/3 = −0.502, exactly matching the difference between the values for white (−0.063) and red (−0.111) phosphorus in equilibrium with PH3.

References

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  2. Greenwood and Earnshaw, p. 1263
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  31. Leszczyński, P.J.; Grochala, W. (2013). "Strong Cationic Oxidizers: Thermal Decomposition, Electronic Structure and Magnetism of Their Compounds" (PDF). Acta Chim. Slov. 60 (3): 455–470. PMID 24169699. Archived (PDF) from the original on 2022-10-09.
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