Abstract
A lead electrode has been prepolarized anodically in sulfuric acid solution and then subjected to a cathodic potential sweep with simultaneous illumination. The photocurrents produced by PbO change from anodic to cathodic values pass through zero as the potential sweep continues. Under the present conditions, the potential at zero photocurrent is a fixed value, viz., −0.65 V, (versus Hg/Hg 2SO 4), and is equal to the flat-band potential of PbO. From this, the pH in the PbO layer is calculated to be 9. This finding provides strong support for the alkalization model of the PbSO 4 anodic layer.
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