Izgi, Mehmet SaitOnat, ErhanSahin, OmerSaka, Cafer2024-12-242024-12-2420240360-31991879-3487https://doi.org/10.1016/j.ijhydene.2023.08.119https://hdl.handle.net/20.500.12604/6586Here, carbon quantum dot (CQD) supported Ru nanoparticles from the caffeine in methanol or water by the hydrothermal method were synthesized for the first time to produce hydrogen (H-2) by hydrolysis of ammonia borane(NH3BH3) and their catalytic activities were investigated. The chemical compositions and morphology structures of this caffeine carbon dot-supported Ru catalysts were carefully characterized by UV, PL, TEM, FTIR, and ICP/OES analyses. Well-dispersed Ru nanoclusters with similar to 1.81 nm particle size on CQD by the hydrothermal method in methanol medium showed very good catalytic performance. The turnover frequency (TOF) obtained for H-2 production from the catalytic hydrolysis of 5% NH3BH3 with CQD supported Ru catalyst obtained by the hydrothermal method in methanol and water was found to be 361 and 1895 mol H-2 min(-1) mol(-1), respectively. The activation energies (Ea) for NH3BH3 hydrolysis with the same catalysts were measured as 33.32 and 27.80 kJmol(-1), respectively.eninfo:eu-repo/semantics/closedAccessCaffeine carbon quantum dotRutheniumMethanolHydrothermal treatmentHydrogenArticle51180192Q1WOS:001139904700001Q12-s2.0-8516907238010.1016/j.ijhydene.2023.08.119