Preparation of Pt/K2La2Ti3O10 and its photo-catalytic activity for hydrogen evolution from methanol water solution.

A layered perovskite-type oxide K₂La₂Ti₃O₁₀ was prepared with high-temperature solid-state reaction, and characterized with X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). Platinum was loaded onto K₂La₂Ti₃O₁₀ as a co-catalyst with different methods. The dispersion of platinum on K₂La₂Ti₃O₁₀ was determined with HOT method. The photocatalytic activity of Pt/K₂La₂Ti₃O₁₀ was studied. This catalyst showed much higher activity in hydrogen evolution reaction than Ni/K₂La₂Ti₃O₁₀. The effects of different amounts of loaded platinum and several preparation methods were evaluated. The best achieved hydrogen evolution rate was 233.88 μmol·h⁻¹ by Pt(2%)/K₂La₂Ti₃O₁₀. A possible band structure and mechanism were discussed based on the results. [ABSTRACT FROM AUTHOR]