Abstract
Although lead-acid batteries contain about 11 to 30% by weight of electrolyte, the reuse of sulphuric acid solutions raises many questions concerning the advantages of this process, mainly due to the influence of these solutions on performance of batteries. The electrolyte may have critical amounts of dissolved metal ions that can decrease the hydrogen production overvoltage, increasing water loss and decreasing its electrical performance. In the present work, the influence of Cu2+, Mn2+ and Fe3+ ions present in reused electrolytic solutions on the hydrogen evolution potential in the negative electrode was investigated. An assumption of the physicochemical action of these contaminants was investigated by cyclic voltammetry and electrochemical impedance. The results showed that all the metal ions displace the potential of hydrogen evolution to less cathodic values, indicating that these species must have their concentrations minimized to allow acid solution reuse in lead-acid batteries without significant loss of performance.
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