Negative plates oxygen reduction

Unlimited diffusion and the rapid reduction of oxygen will have an effect on the potential of the negative plate. It will remain elose to the open-circuit value, with the potential of the positive plate becoming more positive under the usual... 

Experiments were performed using plates with expanders Quebraco and EZE-Skitan. The resulting capacity curves, as a function of the time of oxidation or reduction, are presented in Fig. 7.7. Besides the plates subjected to oxidation or reduction, reference negative plates with the same expanders were left in the test cells with no hydrogen or oxygen attack. 

Having reviewed the transfer of oxygen and hydrogen ions between the positive and negative plates, let us now discuss the processes of reduction of oxygen at the negative plates. 

Thus, PbO is an intermediate product formed by a chemical reaction of oxygen reduction, which is then reduced to Pb through an electrochemical reaction. If we sum up the two reactions, we will see that the water decomposed to evolve oxygen at the positive plates is restored at the negative plates via reactions of different nature. 

Schematic representation of the electrochemical mechanism of oxygen reduction in active centres at the phase boundary metal/thin liquid film (see point (a) in Section Mechanism of the oxygen reduction at the negative plates chapter) [37].

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