Abstract
The effect of the concentration of sulfuric acid solution on the charge reaction rate of the positive electrode in a lead‐acid battery was investigated by a use of lead sulfate formed on a gold plate. The oxidation current of lead sulfate to lead dioxide depended on the sulfuric acid concentration strongly. The oxidation rate was considered to depend on both the reaction interface area and the charge transfer rate at the reaction site. The reaction interface area changed similarly in the various sulfuric acid concentrations used in this study. From this fact, it seemed that the oxidation rate of lead sulfate was determined from the charge transfer reaction rate. The charge transfer reaction rate in was the largest of five sulfuric acid solutions.
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