| 초록 |
To synthesize durable catalysts, CoS microsheet particles are woven into a polyhedral cage shape to prevent dissolution and light corrosion during photochemical reactions. TiO2 nanoparticles with excellent stability against water and light are used to enclose the cage. The xCoS@yTiO2 heterojunction catalyst has a stronger ability to absorb visible light and greater photocatalytic H2 evolution activity: When lactic acid is used as sacrificial agent, the H2 production of 1CoS@2TiO2 reaches 1945 μmol g-1 for 10h. ESR results reveal that charge transfer in CoS@TiO2 follows the S-scheme mechanism. The exellent catalystic activity of the core-shell shaped CoS@TiO2 is because of its favorable bandgap location for water splitiong, higher photocurrent density, lower photoluminescence, and having strong redox sites. These factors ultimately delay the recombination of photo-induced electron/hole pairs and, as a result, high cataytic efficiency is stably maintained up to the 5th recycling test. |
