Galia Petkova

Bulgarian Academy of Sciences, Ulpia Serdica, Sofia-Capital, Bulgaria

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Publications (2)6.69 Total impact

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    ABSTRACT: Lead dioxide obtained by using various methods in combination with particles ranging from nanometric to micrometric size was tested as positive active material in lead-acid cells. The structural and textural properties of the material were determined by using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM), N2 adsorption measurements and thermogravimetric analysis (TGA). Thin lead dioxide positive electrodes were prepared with obtained materials by spray deposition technique and were subjected to cycling tests. The combination of a small particle size (in the nanometric range) and the presence of water strongly bound to the lattice is essential to ensure a high utilization of the active material and good cycling properties of the positive electrode. Therefore, appropriate nanometric materials provide an effective method for increasing the efficiency of the active material in lead-acid batteries.
    Journal of Power Sources 01/2006; 158(2):831-836. · 4.68 Impact Factor
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    ABSTRACT: Nanostructured PbO2 obtained by hydrolysis of Pb(CH3COO)4 is shown to exhibit an excellent electrochemical activity as a thin electrode in lead-acid cells. This material was characterized by X-ray diffraction, electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and Brunauer-Teller-Emmett measurements. The electrode was prepared by spray deposition of the nanostructured PbO2 material and showed high utilization ~about 65% of the theoretical capacity and good cycling stability at discharge current of 1 C. It is suggested that the nanostructure is the key factor for the enhanced electrochemical activity of lead dioxide.
    Electrochemical and Solid-State Letters 01/2004; 7(4):75-77. · 2.01 Impact Factor