Electrochemical behavior of PbO2/PbSO4 electrode in the presence of surfactants in electrolyte
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Date
2020-03
Journal Title
Journal ISSN
Volume Title
Publisher
Université de M'sila
Abstract
The electrochemical behavior of PbO2/PbSO4 electrode is investigated in 4.5M H2SO4 in
presence of three surfactants, Sodium Dodecyl Sulfate (SDS), Cetyltrimethylammonium bromide
(CTAB) and Sodium tripolyphosphate (STPP), using cyclic voltametry, electrochemical spectroscopy
impedance and galvanostatic discharge as techniques. The micro morphology of the surface
of the modified PbO2 electrodes is examined by scanning electron microscopy. The results show
that SDS and CTAB when added in the electrolyte could refine the coating particles and change the
roughness of the surface of the electrode leading to a thin film of PbO2 with amorphous character.
In addition, SDS and CTAB shift the hydrogen evolution potential towards more negative values,
improve the discharge capacity of the anodic layer and accelerate the charge transfer. Under cathodic
polarization, CTAB presents the lowest value of the charge transfer resistance Rct. In the contrary,
STPP shifts the oxygen evolution potential towards more positive values, passivates the
surface of the electrode and inhibits completely the reaction of PbO2 formation.
2020 Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under
Description
Keywords
Lead dioxide; Surfactants; Cyclic voltammetry; Galvanostatic discharge; Electrochemical impedance spectroscopy