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Inside Cover: Ligand Assisted Thermal Atomization of Palladium Clusters: An Inspiring Approach for the Rational Design of Atomically Dispersed Metal Catalysts (Angew. Chem. Int. Ed. 16/2023) |
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| Authors: | Sicong Wang Tao Ding Tong Liu Yanan Zhu Zhinan Tao Beibei Pang Xiaokang Liu Qiquan Luo Mei Sun Hongting Sheng Prof. Manzhou Zhu Prof. Tao Yao |
| Affiliation: | 1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029 P. R. China;2. Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, 230601 P. R. China Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Anhui University), Ministry of Education, Hefei, 230601 (P .R. China;3. Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601 P. R. China;4. Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 P. R. China;5. Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, 230601 P. R. China |
| Abstract: | The transformation from metal nanocluster catalysts to metal single-atom catalysts is an important procedure in the rational design of atomically dispersed metal catalysts (ADCs). However, the conversion methods often involve high annealing temperature as well as reducing atmosphere. Herein, we reported a continuous and convenient approach to transfer Pd nanocluster into Pd single-atom in a ligand assisted annealing procedure, by which means we reduced its activating temperature low to 400 °C. Using ex-situ microscopy and spectroscopy, we comprehensively monitored the structural evolution of Pd species though the whole atomization process. Theoretical calculation revealed that the structural instability caused by remaining Cl ligands was the main reason for this low-temperature transformation. The present atomization strategy and mechanistic knowledge for the conversion from cluster to atomic dispersion provides guidelines for the rational design of ADCs. |
| Keywords: | Ex-situ Synchrotron X-Ray Absorption Spectroscopy Ligand Effects Nanoclusters Palladium Single-Atom Catalysts |