Decoration of TiO 2 P-25 nanoparticles with Pt nanoparticles TiO 2 P-25 nanoparticles were decorated with pre-synthesised Pt nanoparticles by solvent evaporation. Briefly, a MeOH suspension of TiO 2 P-25 (Sigma Aldrich, 21 nm primary size, 0.2 w/v%) and Pt nanoparticles (Sigma Aldrich, 3 nm, 0.01 w/v%) was prepared. The solvent was then slowly removed in a rotary evaporator at 50C, as the pressure was gradually reduced to a final pressure of 120 mbar. The resultant grey precipitate was then collected and dried for 2 hours at 120C under vacuum.