Browsing by Author "L. Zerroual"

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    Electrochemical behavior of PbO2/PbSO4 electrode in the presence of surfactants in electrolyte
    (Université de M'sila, 2020-03) O. Saoudi; M. Matrakova; A. Aleksandrova; L. Zerroual
    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
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    Preparation and Characterization of a new plasticized polymer electrolyte for "all solid state" Zn/MnO2 cell
    (Université de M'sila, 2021) Z. Gharnout; L. Telli; A. Merrouche; L. Zerroual; S.Walter
    A solid polymer electrolyte with a polyvinyl alcohol (PVA) matrix and a mixture of ethylene glycol (EG) and phosphoric acid as proton conductor has been developed. These complexes have been studied by X-ray diffraction (XRD), infrared Fourier transform spectrometry (FTIR) and electrochemical impedance spectrometry (EIS).The optimum ionic conductivity value of the ternary PVA-EG(45 wt.%)-H3PO4(5 wt.%) complex film has been achieved to be 5.2 10-3 S cm-1 at RH = 100% with adequate mechanical properties (especially flexibility) and with a low activation energy of 9 kJ mol-1. Due to their good electrical as well as mechanical properties, such material has been successfully used as solid state protonic electrolyte in Zn/MnO2 cell with a capacity of 220Ahkg-1andan energy density up to 286 Wh kg-