Standard electrode potential (data page)

Summary

The data values of standard electrode potentials (E°) are given in the table below, in volts relative to the standard hydrogen electrode, and are for the following conditions:

A temperature of .
An effective concentration of 1 mol/L for each aqueous species or a species in mercury amalgam (an alloy of mercury with another metal).
A partial pressure of 101.325 kPa (absolute) (1 atm, 1.01325 bar) for each gaseous reagent. This pressure is used because most literature data are still given for this value (1 atm) rather than for the current standard of 100 kPa (1 bar) presently considered in the standard state.
An activity of unity for each pure solid, pure liquid, or for water (solvent). The relation in electrode potential of metals in saltwater (as electrolyte) is given in the galvanic series.
Although many of the half cells are written for multiple-electron transfers, the tabulated potentials are for a single-electron transfer. All of the reactions should be divided

Official source

https://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page)

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The Mn(III)/Mn(II) redox couple with a standard potential of +1.51 V vs . SHE has drawn interest for the design of V/Mn redox flow battery (RFB). However, Mn(III) disproportionation leads to a loss of capacity, an increase of pressure drop and electrode passivation due to the formation of MnO 2 during battery cycling. In this work, we studied the influence of Ti(IV) or/and V(V) on Mn(III) stability in acidic conditions, by formulating 4 different electrolytes at equimolar ratios (Mn, Mn:Ti, Mn:V, Mn:V:Ti). Voltammetric studies have revealed a EC i process for Mn(II) oxidation responsible for the electrode passivation. SEM and XPS analysis demonstrate that the nature and the morphology of the passivating oxides layer strongly rely on the electrolyte composition. Spectroelectrochemistry highlights the stabilization effect of Ti(IV) and V(V) on Mn(III). At a comparable pH, the amount of Mn(III) losses through disproportionation is decreased by a factor of 2.5 in the presence of Ti(IV) or/and V(V). V(V) is an efficient substitute to Ti(IV) in order to stabilize Mn(III) electrolyte for redox flow battery applications.

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