In Situ Observation of Hydrogen-Induced Surface Faceting for Palladium–Copper Nanocrystals at Atmospheric Pressure
Ying Jiang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
These authors contributed equally to this work.
Search for more papers by this authorHengbo Li
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
These authors contributed equally to this work.
Search for more papers by this authorZhemin Wu
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorWenying Ye
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorProf. Hui Zhang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorCorresponding Author
Prof. Yong Wang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorCorresponding Author
Dr. Chenghua Sun
ARC Centre for Electromaterials Science, School of Chemistry, Monash University, Clayton, Victoria, 3800 Australia
Search for more papers by this authorProf. Ze Zhang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorYing Jiang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
These authors contributed equally to this work.
Search for more papers by this authorHengbo Li
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
These authors contributed equally to this work.
Search for more papers by this authorZhemin Wu
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorWenying Ye
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorProf. Hui Zhang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorCorresponding Author
Prof. Yong Wang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorCorresponding Author
Dr. Chenghua Sun
ARC Centre for Electromaterials Science, School of Chemistry, Monash University, Clayton, Victoria, 3800 Australia
Search for more papers by this authorProf. Ze Zhang
State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
Search for more papers by this authorGraphical Abstract
In good shape: Deliberate surface faceting of palladium–copper alloyed nanocrystals was achieved by simple post-synthetic treatment in atmospheric pressure hydrogen. Microscopic insight is provided for tailoring of the physical and chemical properties of catalytically significant palladium alloys.
Abstract
Nanocrystal (NC) morphology, which decides the number of active sites and catalytic efficiency, is strongly determined by the gases involved in synthesis, treatment, and reaction. Myriad investigations have been performed to understand the morphological response to the involved gases. However, most prior work is limited to low pressures, which is far beyond realistic conditions. A dynamic morphological evolution of palladium–copper (PdCu) NC within a nanoreactor is reported, with atmospheric pressure hydrogen at the atomic scale. In situ transmission electron microscopy (TEM) videos reveal that spherical PdCu particles transform into truncated cubes at high hydrogen pressure. First principles calculations demonstrate that the surface energies decline with hydrogen pressure, with a new order of γH-001<γH-110<γH-111 at 1 bar. A comprehensive Wulff construction based on the corrected surface energies is perfectly consistent with the experiments. The work provides a microscopic insight into NC behaviors at realistic gas pressure and is promising for the shaping of nanocatalysts by gas-assisted treatments.
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