Catalytic Activation and Deactivation of Pt-Pd Film Immobilized on Nafion Surface in Attaining Decomposition of Hydrogen Peroxide

Bi-metallic Pt-Pd catalytic films were immobilized on Nafion-117 membrane to decompose hydrogen peroxide. A basic medium helps to enhance autocatalysis of hydrogen peroxide decomposition reaction. Although H₂O₂ decomposition is strongly increased by the presence of iodide ions and sodium dodecyl sulfate species but they deactivate the catalytic surface. Among several sulfate salts (CoSO₄.7H₂O, K₂SO₄ and CuSO₄), only NiSO₄.7H₂O influenced to increase the reaction rate. Meanwhile, the Hg²⁺ species not only inhibits the decomposition process but also permanently damage the activity of the catalytic surface