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Instruments / Technical Area	Publication Details	Published
B18-Core EXAFS	Effective ensemble of pt single atoms and clusters over the (Ni,Co)(OH)2 substrate catalyzes highly selective, efficient, and stable hydrogenation reactions Lihua Zhu , Yilun Sun , Huaze Zhu , Guoliang Chai , Zhiqing Yang , Congxiao Shang , Hengqiang Ye , Bing Hui Chen , Anna Kroner , Zhengxiao Guo Acs Catalysis DOI: 10.1021/acscatal.2c01901 Diamond Proposal Number(s): [29684] Show Abstract ▼ Abstract: A Pt–Ni–Co catalyst was synthesized with Pt single atoms and atomic clusters (SAACs) dispersed over (Ni,Co)(OH)2 nanoparticles on a carbon matrix, which leads to high catalytic activity, up to 100% conversion, and selectivity in the hydrogenation of nitroaromatics under moderate conditions (H2 ∼ 1.0 MPa and ≤40 °C). A synergistically coordinated ensemble effect of the Pt SAACs is identified with the strongly polarized Pt single atoms preferentially adsorbing the −NO2 and the Pt clusters adsorbing and homolytically dissociating H2 molecules, and the H species then readily move to the adsorbed −NO2 group, overcoming a much reduced energy barrier on the (Ni,Co)(OH)2, enhancing the reaction rate by ca. 50 times. The approach not only reveals the coordinated ensemble catalysis mechanism of SAACs but also provides a strategy of developing highly efficient and selective catalysts by fine tuning of the electronic microenvironment from single atoms to atomic clusters co-located over a multimetallic substrate. The demonstrated case for nitroarenes can be readily applied for other species containing −NO2 or other easily hydrogenated groups (such as C═C, C≡N, and C═O).	Jun 2022
B18-Core EXAFS	Ruthenium stabilized on transition metal-on-transition metal oxide nanoparticles for naphthalene hydrogenation Xiangling Deng , Lihua Zhu , Huan Zhang , Anna Kroner , Jinbao Zheng , Nuowei Zhang , Jun He , Bing Hui Chen International Journal Of Hydrogen Energy DOI: 10.1016/j.ijhydene.2018.05.170 Diamond Proposal Number(s): [12263] Show Abstract ▼ Abstract: The multi-metallic nanocatalysts of ruthenium nanoclusters-on-transition metal/transition metal oxide nanoparticles (TM/TMO NPs) then supported on carbon (Ru/Ni/NiO/C or Ru/Co/Co3O4/C) were designed and synthesized. The Ni/NiO or Co/Co3O4 NPs strongly stabalized the ruthenium nanoclusters by the interfacial interaction among them. These catalysts exhibited high catalytic activity and 100% selectivity to decalin for naphthalene hydrogenation due to the synergy effect of multiple catalytic sites, where naphthalene was absorbed and activated at the TMO sites (NiO or Co3O4), H2 was activated at the Ru sites and it produced the activated H* species, H* was transferred to the surface of NiO or Co3O4 by the hydrogen spillover effect of TM (Ni or Co), reacting with the activated naphthalene and forming decalin. The nanostructures and synergetic effect of the Ru/Ni/NiO/C and Ru/Co/Co3O4/C catalysts were revealed by a series of techniques, such as high-resolution transmission electron microscope (HRTEM), temperature-programmed reduction (TPR), scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS) mapping, high-sensitivity low-energy ion scattering (HS-LEIS) and X-ray absorption spectroscopy (XAS). It is promising that the hydrogen storage can proceed at room temperature via catalyzing naphthalene hydrogenation over the Ru/Ni/NiO/C or Ru/Co/Co3O4/C catalyst.	Jun 2018
B18-Core EXAFS	Ruthenium-nickel-nickel hydroxide nanoparticles for room temperature catalytic hydrogenation Li Hua Zhu , Shiyao Shan , Valeri Petkov , Weiwei Hu , Anna Kroner , Jinbao Zheng , Changlin Yu , Nuowei Zhang , Yunhua Li , Rafael Luque , Chuan-Jian Zhong , Hengqiang Ye , Zhiqing Yang , Bing Hui Chen Journal Of Materials Chemistry A DOI: 10.1039/C7TA01437F Show Abstract ▼ Abstract: It represents a major challenge to improve the utilization of metals in heterogeneous catalysts with excellent catalytic performance, high selectivity and good stability. Herein a new strategy is disclosed by enabling a nanoscale synergy between a transition metal and a noble metal. A novel Ru/Ni/Ni(OH)2/C catalyst with the hybrid of Ru nanoclusters anchored on Ni/Ni(OH)2 nanoparticles (NPs) was designed, prepared and characterized. The Ru/Ni/Ni(OH)2/C catalyst exhibited a remarkable catalytic activity in naphthalene hydrogenation in comparison with existing Ru/C, Ni/Ni(OH)2/C and Ru-Ni alloy/C catalysts. This is mainly attributed to the interfacial Ru, Ni and Ni(OH)2 sites in Ru/Ni/Ni(OH)2/C, where hydrogen is adsorbed and activated on Ru whereas Ni transfers the activated hydrogen species (as a “bridge”) to the activated naphthalene on Ni(OH)2 sites, producing decalin in a highly-effective pathway.	Mar 2017

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