Effects of Cl⁻ and F⁻ Adsorption on Methanol Oxidation on Polycrystalline Platinum Electrode

The adsorption of anions on platinum electrode was determined by electrochemical impedance spectroscopy in H₂SO₄ solution. The results indicate that addition of Cl⁻ may increase adsorption capacitance largely, while F has little influence on adsorption capacitance. The results of cyclic voltammetry (CV) show that the methanol oxidation peak current decreases slowly with increase the concentration of F, but drastically with the increase of Cl⁻ concentration.