Survey on Charge/Discharge Behavior at Lead Dioxide by Measuring Electrode Capacitance

概要

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The reaction process of charge/discharge in sulfuric acid aqueous solution on the PbO_2 formed on micro-platinum electrode was examined by the analysis of the measuring results of i-V and C-V characteristics. In the C-V haracteristics, the canacitance value increased in the potential of negative side from the charge beginning potential. Further, the capacitance value more increased at the charging potential, and kept on high value under charging advanced potential. By negatively directive potential scanning, the large capacitance continued until the discharge potential, and the value rapidly decreased at the discharging peak current potential. And, it was also found that there was H^+ concentration dependence on the capacitance value. The reason of bringing about the Phenomenon is regarded as H^+ intercalated into Pb0_2 crystal structure inside under the state of charge, and the crystal structure distorted, and then, the dielectric constant increased. In the C-V, the fact in which the capacitance value grows greater at the potential of negative side from the charge starting potential is thought H^+ adsorbing strongly in this potential at the PbS0_4 surface. This appears to induce the intercalation of H^+ into inside of Pb0_2 crystal.
鈴鹿工業高等専門学校の論文
2003-01-31