Abstract
This study is focused on detail research of the structural and morphological changes in cuprate ceramics Bi1.7Pb0.3Sr2CaCu2Ox (B(Pb)SCCO 2212) and Bi1.7Pb0.3Sr2CuOx (B(Pb)SCCO 2201) during the electrochemical treatment. Their electrochemical reduction behavior is investigated by Cyclic Voltammetry (CV) and Chronopotentiometry (CP) in 7 M KOH. The used ceramic powders are physicochemically characterized before and after the electrochemical test. It has been found that ceramics are reduced during the charging process. The reduction products are different oxides and hydroxides as well as Cu and Bi metals. Their presence probably improve the overall conductivity of the electrode and the contact between the particles of the negative active mass. On the other hand, the Ca- and Sr-products in the case of B(Pb)SCCO 2212 modification decrease the solubility of ZnO in the electrolyte and suppress the shape change of the electrode.
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