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Single-Atom Ru Catalyst-Decorated CNF(ZnO) Nanocages for Efficient H2 Evolution and CH3OH Production
journal contributionposted on 2023-12-11, 18:20 authored by Chandra Shobha Vennapoosa, Sagar Varangane, B. Moses Abraham, Vidha Bhasin, Santanu Bhattacharyya, Xuefeng Wang, Ujjwal Pal, Debabrata Chatterjee
The presence of transition-metal single-atom catalysts effectively enhances the interaction between the substrate and reactant molecules, thus exhibiting extraordinary catalytic performance. In this work, we for the first time report a facile synthetic procedure for placing highly dispersed Ru single atoms on stable CNF(ZnO) nanocages. We unravel the atomistic nature of the Ru single atoms in CNF(ZnO)/Ru systems using advanced HAADF-STEM, HRTEM, and XANES analytical methods. Density functional theory calculations further support the presence of ruthenium single-atom sites in the CNF(ZnO)/Ru system. Our work further demonstrates the excellent photocatalytic ability of the CNF(ZnO)/Ru system with respect to H2 production (5.8 mmol g–1 h–1) and reduction of CO2 to CH3OH [249 μmol (g of catalyst)−1] with apparent quantum efficiencies of 3.8% and 1.4% for H2 and CH3OH generation, respectively. Our studies unambiguously demonstrate the presence of atomically dispersed ruthenium sites in CNF(ZnO)/Ru catalysts, which greatly enhance charge transfer, thus facilitating the aforementioned photocatalytic redox reactions.
xanes analytical methodsstudies unambiguously demonstratefirst time reportfacile synthetic procedureexcellent photocatalytic abilityapparent quantum efficienciesatom ru catalyst2 subru single atoms3 sub8 mmol gatom sitesthus facilitatingruthenium singlereactant moleculesmetal singleatomistic nature249 μmol