Browsing by Author "Bounoughaz, M."
Now showing 1 - 6 of 6
- Results Per Page
- Sort Options
Item The effect of surfactants on the efficiency of lead acid batteries(Elsevier, 2015) Boudieb, Naima; Bounoughaz, M.; Bouklachi, A.The aim of this study is to show the effect of two phosphonate surfactants (PS) on the electrochemical behavior of the negative plate of lead-acid battery in the sulfuric acid medium. The characterization of the electrode interface was investigated at room temperature by a set of electrochemical techniques as linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronoamperometry (CA). Scanning electron microscopy (SEM) was employed to determine the film layer's morphology deposited on the surface of working electrodes, in the presence and in the absence of the PS. When the PS was added in the acidic solution, hydrogen evolution became higher, the over-potential of hydrogen was shifted to negatives values and the growth of the anodic β-PbO2 was inhibited. SEM imaging with the presence of PS showed reduction in the growth of the anodic β-PbO2 and PbSO4 layers. EIS results indicate the decrease of the conductivity of β-PbO2 film on the lead surface electrode. The result of the CV, show a decrease in the peak related to transition of PbO to Pb demonstrates that lower PbO has been formed underneath the lead sulfate membrane in the presence of low concentration of SP indeed a decrease in the amount of formed PbSO4 on the electrode surfaceItem Effect of surfactants on the electrochemical behavior of the positive plate(2016) Boudieb, Naima; Bounoughaz, M.; Bouklachi, A.The main goal of this research is to improve the performance of positive plate of lead-acid battery using surfactants in 0.5 M H 2 SO . The use of surfactants aims to increase the ability and the cycle life of the positive active material. The electrochemical behavior of pure lead and PbO 4 electrodes interface was investigated at room temperature by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potential-dynamic polarization curves. Scanning electron microscopy (SEM) was used to explore the film layer morphology deposited on the surface of working electrodes. Cyclic voltammograms of pure lead (Pb) electrode show that in the presence of PS the current peaks of the transition of PbO 2 to PbSO 4 and PbO 2 to PbSO 4 2 dropped at small concentrations of surfactants. We observed a remarkable improvement of the discharge capacity of the PAM for an amount of PS ranging between 10 and 50 ppm. EIS results indicate the improvement of mass transport by the decrease of resistance. In the other hand, the PbSO 4 surface layers and the crystal size of PbSO changes with impact effect of surfactants. As a result of the morphological changes which occurred, the PbO 4 films formed are hardly more reducible with PbSO 4 and delays the appearance of resistive PbSO layers at the material interface. As a conclusion, we can say that the electrical performance of the battery increase by extending the life cycleItem The effectiveness of Henna as corrosion inhibitor for lead of battery in the sulphuric acid medium(Université M'hamed Bougara de Boumerdès, 2020) Bouabdallah, Mounira; Bounoughaz, M.The study carried out is based on the improvement of lead-acid battery behaviour, protecting lead from attacks of 5M sulphuric acids. The conservation of its properties is guaranteed thanks to the Henna green inhibitor. Our hypothesis is reinforced by electrochemical results: resistance to the acidity of sulphuric acids and significant inhibition by adsorbing to the lead surface according to the Langmuir isotherm. One of the big enemy factors of lead-acid batteries is temperature, when it increases, it damages its capacity; but our surfactant at a temperature of 339 K produced a 118 Ohm.cm2 corrosion resistance with enthalpy ΔHinh = 4.20 KJ.mol-1 using only 0.08 ml in 25ml (H2SO45M). Thus, we can see the effectiveness of the henna extract; the protective power increases with the increase of the temperature.Item Electrochemical characterization of semiconductor photovoltaic silicon(ALJEST, 2022) Salhi, Nedjma; Salhi, E.; Bounoughaz, M.The objective of this search is the use of the electrochemical techniques to verify the homogeneous of the photovoltaic silicon elaborated by electromagnetic brewing at 250 A. The used electrolytic medium are 3,5% NaCl and acidified 3,5% NaCl (pH 3). The results obtained from several techniques (Open circuit potential, Tafel curves, chronopotentiommetry and electrochemical impedance spectrometry), indicate the existence of a heterogeneousness structure in the silicon ingot.Item Electrochemical impedance spectroscopy evaluation of behaviour of Pb-Ag anodes for zinc electrowinning(2013) Zhang, W.; Bounoughaz, M.; Ghali, E.; Houlachi, G.Item The influence of the second fusion on the microstructue and electrochemical behaviour of Algerian zinc(European Journal of Scientific Research, 2006) Bounoughaz, M.; Salhi, E.; Dalard, F.; Ghali, E.Zinc from the Algerian metallurgy industry (zinc A) was compared with specimens of the same zinc following fusion treatment at 500°C for 60 minutes and cooling according to three different kinetics. The treated materials are designated by B, C, and D. The fusion/cooling treatment modified the microstructural state of the metal. The different microstructural states were revealed by X-ray diffraction. Electrochemical studies of the treated zinc specimens were performed using voltammetry, potentiometry and electrochemical impedance spectroscopy (EIS). Only a significant variation in EIS results was found. The EIS diagrams of the materials varied with immersion times. The variations in low frequency resistance were directly correlated with the microstructural states of the specimens. The results of the study indicate that fusion treatment at 500°C for 60 minutes and cooling by nitrogen to 10 l min-1 is the most suitable for use as a sacrificial anode. © EuroJournals Publishing, Inc. 2006