Characterization of some organic additives and their effect on the anodic dissolution of lead

Authors

  • Fleurdelis A. Pablo Institute of Chemistry, University of the Philippines, Diliman, Quezon City
  • Victoria A. Vicente-Beckett Institute of Chemistry, University of the Philippines, Diliman, Quezon City

DOI:

https://doi.org/10.26534/kimika.v6i1.21-36

Keywords:

organic additives, battery expanders, lead-acid battery, lead anodic dissolution, lead electrode

Abstract

Certain organic substances are commonly added to the negative (lead) electrode of the lead-acid battery to improve its capacity. Five commercial additives and a dye were characterized using several analytical and elestrro-chemical methods. Elemental analyses showed that the additives consisted of 10-11 carbon atoms and 10-13 hydrogen atoms. Thin-layer and reverse-phase high-pressure liquid chromatography indicated that the additives were large polar substances consisting of three to six components present in different amounts.

The stability of the additives in sulfuric acid solutions was studied by ultraviolet-visible and infrared spectroscopy. Infrared spectra, in particular, demonstrated structural changes in the nature of the additives after prolonged standing in sulfuric acid.

Linear scan voltammetry and chronopotentiometry on smooth lead-foil electrode support the dissolution-precipitation mechanism during the anodic dissolution of lead in the presence of additives. The additives apparently prevent the formation of a passivating film of lead sulfate at the lead electrode. With prolonged standing in acid, the additives lost their effect on the lead electrode and the solid-state mechanism prevailed. Voltametric titration of the additives with lead (II) ions suggested that the additive may bind with lead (II), possibly through a complexation reaction.

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How to Cite

Pablo, F. A., & Vicente-Beckett, V. A. (1990). Characterization of some organic additives and their effect on the anodic dissolution of lead. KIMIKA, 6(1), 21–36. https://doi.org/10.26534/kimika.v6i1.21-36

Issue

Vol. 6 (1990)

Section

Research Articles

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