2026-04-13T05:42:25Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1839842026-01-18T08:51:31Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Caudillo Flores, Uriel author Kubacka, Anna author Berestok, Taisiia author Zhang, Ting author Llorca Piqué, Jordi author Arbiol, Jordi author Cabot, Andreu author Fernández García, Marcos author 2020-01-13 In this contribution we synthesized ternary CuGaS2-TiO2-Pt materials. The semiconductor components were surface functionalized with mercapto-alifatic acids to drive their linking and were platinized prior to or after contact between the semiconductors. The corresponding samples were utilized in the photo-production of hydrogen using methanol as a sacrificial agent. The testing under UV and visible illumination conditions together with the calculation of the true quantum efficiency of the process demonstrate the outstanding performance of these ternary materials under sunlight operation. Optimum activity was achieved for samples having a 3 to 5 wt % of the chalcogenide and a selective interaction of the noble metal with the major oxide component. The physico-chemical characterization and particularly the use of photoluminescence spectroscopy showed that photo-activity is controlled by charge separation under illumination, which drives to charge location of electrons and holes in different components of the powders and the efficient use of charge carriers in the chemical reaction. Postprint (published version) Àrees temàtiques de la UPC::Energies::Tecnologia energètica Photocatalysis Hydrogen Photocatalysis Anatase Platinization Sunlight Quantum efficiency Fotocatàlisi Hidrogen Hydrogen photogeneration using ternary CuGaS2-TiO2-Pt nanocomposites