Electrocatalysis of anodic oxygen evolution at the nickel hydroxide electrode by ferric hydroxo species in alkaline electrolytes

Spectroscopic study of nickel(II) hydroxide surface modifications induced by a small iron(III) addition

“…The absence of Fe at the initial surface of the binary system (3 at.% Fe) studied here must also lead to a lower electrocatalytical activity of the latter in view of the surface-related electrocatalytical activity of iron in binary Ni-Fe hydroxides towards anodic oxygen evolution in alkaline media [5,15,16], which agrees with the experimental data [5].…”

The oxygen evolution kinetics in sealed rechargeable NiMH batteries

“…9). This has been reported before for both pure Nickel-hydroxide electrodes and additive-incorporated Nielectrodes [9][10][11]14,16,19,72,73,[76][77][78][79]. However, in the reviewed cases, the values of the Tafel slopes differ appreciably from 10 to 90 mV/dec at low overpotentials and between 65 and 300 mV/dec at high overpotentials.…”

Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions

“…According to Troilius and Alfelt [38], the negative influence of Fe compounds is due to the decrease of oxygen overvoltage on NiO x electrode, which leads to lowering of capacity of the positive electrode. Kamnev et al [39] examined the influence of iron hydroxide in the wide potential range and observed three linear parts on the polarization curves. In the first (I) potential region the Tafel slope decreased from 31 mV dec −1 to about 27 mV dec −1 with the increasing concentration of Fe-complex salts in the solution.…”

“…Finally, in the third potential region, the Tafel slope increased to about 174 mV dec −1 . According to Kamnev et al [39], high values of the Tafel slope in the third potential region could be explained by a double barrier model for the charge transfer process: in the Helmholtz double layer for ions and in the oxide film adjacent to the oxide|electrolyte interface for electrons.…”