Gold‐Nanoparticle‐Loaded Carbonate‐Modified Titanium(IV) Oxide Surface: Visible‐Light‐Driven Formation of Hydrogen Peroxide from Oxygen

Gold nanoparticle‐loaded rutile TiO 2 with a bimodal size distribution around 10.6 nm and 2.3 nm (BM‐Au/TiO 2 ) was prepared by the deposition precipitation and chemical reduction (DP‐CR) technique. Visible‐light irradiation (λ>430 nm) of the BM‐Au/TiO 2 plasmonic photocatalyst yields 35 μ m H 2 O 2 in aerated pure water at irradiation time ( t p )=1 h, and the H 2 O 2 concentration increases to 640±60 μ m by the addition of 4 % HCOOH as a sacrificing electron donor. Further, a carbonate‐modified surface BM‐Au/TiO 2 (BM‐Au/TiO 2 ‐CO 3 2− ) generates a millimolar level of H 2 O 2 at t p =1 h with a quantum efficiency ( Φ ) of 5.4 % at λ =530 nm under the same conditions. The recycle experiments confirmed the stable performance of BM‐Au/TiO 2 .