A quartz crystal microbalance study on a metallic nickel electrode

The Electrochemistry of Metallic Nickel: Oxides, Hydroxides, Hydrides and Alkaline Hydrogen Evolution

“…22 The reversible potential of the α-Ni(OH) 2 On the first reverse potential scan after electrode immersion, a cathodic peak nearly identical to peak (9) is observed and it has been shown that the electrode mass decreases. 49 Ellipsometry measurements during this first reverse scan show that the surface layer is mostly removed at about -300 mV RHE , although, a small surface layer remains. 23 There is no evidence supporting the possibility of a true metal-solution interface in alkaline solution, however, the existence of a s mall amount of u nreactive nickel oxide-hydroxide does not change our interpretation of the voltammetric features.…”

In situ gravimetry of nickel thin film during potentiodynamic polarization in acidic and alkaline sulfate solutions

“…Therefore, the adsorption of (bi) sulfate on nickel thin film electrode in pH 3.0 sulfate solutions may not be so significant in the passive potential region as to influence the partial current density derived from gravimetry. In alkaline solution, Ni 2+ in the passive film dissolves into solution as ionic species of supported by the EQCM study [22] The metal / oxide film / solution system has usually a capacitance component.…”

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

“…On PdNi coatings the peak maximum is shifted towards more negative potentials compared to pure Pd coating, which indicates a stronger adsorption of oxide species on the surface of bimetallic coatings due to the presence of Ni [8]. It was shown that the formation of a monolayer of the -Ni(OH) 2 occurred in the potential region between -1000 mV and -700 mV, while at potentials more positive than 200 mV further oxidation of Ni(II) species into NiOOH occurs [30].…”