Cathodic decomposition of InP studied by XPS

The cathodic decomposition of InP at pH 9 was studied by cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). Under cathodic conditions, the modified surface layer consists mainly of elemental indium (In). In the anodic range, In is converted into In(OH)3. The subsequent cathodic reduction of In(OH)3 to In does not take place to completion, and the amounts of In(OH)3 and In increase irreversibly during cyclic potential scanning.