Electrochemical behavior of PbO2/PbSO4 electrode in the presence of surfactants in electrolyte
| Autor: | L. Zerroual, A. Aleksandrova, O. Saoudi, M. Matrakova |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Cyclic voltammetry
Scanning electron microscope Surfactants General Chemical Engineering 02 engineering and technology Electrolyte 010402 general chemistry Electrochemistry 01 natural sciences Lead dioxide Galvanostatic discharge lcsh:Chemistry chemistry.chemical_compound Sodium dodecyl sulfate Chemistry Oxygen evolution General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Anode lcsh:QD1-999 Chemical engineering Electrode 0210 nano-technology Electrochemical impedance spectroscopy |
| Zdroj: | Arabian Journal of Chemistry, Vol 13, Iss 5, Pp 5326-5331 (2020) |
| ISSN: | 1878-5352 |
| Popis: | The electrochemical behavior of PbO2/PbSO4 electrode is investigated in 4.5 M 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. |
| Databáze: | OpenAIRE |
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