Browsing by Author "SAOUDI Ouarda"

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    Effet des tensioactifs sur les propriétés physico-chimiques et électrochimiques de l’électrode Pb/PbO2 en milieu sulfurique
    (Université de M'sila, 2021) SAOUDI Ouarda
    Abstract: The electrochemical behavior of PbO2/PbSO4 is investigated in 4.5 M H2SO4 in presence of three surfactants, Sodium Dodecyl Sulfate (SDS), Cetyltrimethylammonium bromide (CTAB) and Sodium tripolyphosphate (STPP). 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 deposits 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 passivates the surface of the electrode and inhibits almost completely the oxidation reaction