| Abstract: | Electrochemical Deintercalation of Ag2PbO2 Ag2PbO2 was electrochemically deintercalated. The electrochemical reactions were studied in a two electrode swagelock teflon laboratory cell. A silver metal foil was used as negative electrode, and a pellet of the educt phase Ag2PbO2 (diameter 9 mm, thickness ca. 0.5 mm) without any graphite or binder was used as positive electrode. Silvernitrate, dissolved in acetonitrile (0.1 mol), was applied as liquid electrolyte. The electrotitration was carried out with a constant charge density of 6 μA/cm2. Periods of working potential (48 h) alternated with periods of the open cell potential (3 h). The development of the cell voltage at decreasing silver content shows a continuous change of slope without any extended plateau. The Ag2PbO2 cell was totally charged, and the resulting product of deintercalation was proven to be binary PbO2 in the stable α‐modification. The Rietveld evaluation of the powder diffraction data of intermediate deintercalated phases gave conclusive support to a two phase mode mechanism of deintercalation during which α‐PbO2 was continuously separated without forming AgxPbO2 solid solutions. |
