β Scribed by F.E. Varela; M.E. Vela; J.R. Vilche; A.J. Arvia
No coin nor oath required. For personal study only.
The electrochemical processes related to the passivation of Pb in SM H,SO, at 25"C, have been investigated combining a rotating ring-disk electrode, linear potential sweep voltammetry and potentiostatic pulse techniques complemented with scanning electron microscopic imaging The kinetics of PbSO, anodic layer growth can be explained through the initial formation of a barrier layer acting as an ionic conductor, and the transference of Pb2+ cations from the substrate through the conducting layer yielding Pb 2+ ion in the solution. These ions further contribute to passivation through the precipitation of a PbSO, passivating layer. Kev wards: lead/stdnhuric acid svstem. lead electro-oxidation, nucleation and growth of lead sulphate, lead passivation,'lead soluble s&es.
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The electrode kinetics of dissolution of a smooth Pb electrode and a battery plate in 5 M HISO, have been measured using a new automated measurement system. The Pb dissolution reaction and H2 evolution reaction can be separated using equivalent circuit and a Least squares fitting procedure of theory
Ahstract ~ The mechanism for the anodic formation of peroxydisulfate ion on a Ti-supported IrO, electrode was investigated in mixed aqueous solutions of H,SO., (NH&SO4 and NH,F. Peroxydisulfate ion can be formed in higher yield at lower overpotential on the Ti-supported IrO, electrode. comoared with
## &strati -The effect of the heat treatment of Ti substrate on the service life of Ti-supported 1~0, electrode was investigated in mixed aqueous solutions of H,SO,, (NH,)aS04 and NH,F. The service life was prolonged by the heat treatment ofTi substrate prior to thecoating ofIrOz. Such effect was
Single electrode Pelt& heat of hydrogen electrodes have been measured by two different methods, one is thermoelectric power measurement and the other is calorimetric one. The electrolyte of hydrogen electrodes used in this experiment was 0.05-I .O N H,SO, and 0.05-5 N NaOH aqueous solutions. This p