Abstract
In this work, strontium titanate (SrTiO3)-based photocatalysts exhibited superior visible-light-driven photocatalytic hydrogen (H2) production activity by sensitization with xanthene dyes. A series of Pt-loaded SrTiO3 (Pt/STO) photocatalysts were successfully prepared to systematically investigate the dependence of photocatalytic performance on the types of sacrificial agents and dyes. Photocatalytic experiments demonstrated that triethanolamine (TEOA) sacrificial agent and Eosin Y (EY) photosensitizer were the proper choice for remarkable enhancement of photocatalytic activity, and the H2 yield of the optimal system containing 1.0 wt% Pt/STO reached 491.5 μmol in 2.5 h under visible light irradiation. The reasons causing the results were that TEOA could enhance the adsorption of xanthene dyes on SrTiO3-based photocatalysts, and bromine groups-containing EY has a high intersystem crossing yield. Electrochemical tests, PL results and fluorescence lifetime further demonstrated the efficient electron transfer behavior occurred from photoexcited EY to the conduction band of SrTiO3. This study emphasized the potential application of SrTiO3-based materials in the field of solar hydrogen production.
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