Catalytic Activation and Deactivation of Pt-Pd Surface/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.