A5002878399- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Nanomaterials for catalytic reactions
- Catalysis and Oxidation Reactions
- CO2 Reduction Techniques and Catalysts
- nanoparticles nucleation surface interactions
- ZnO doping and properties
- Zeolite Catalysis and Synthesis
- Catalysts for Methane Reforming
- Semiconductor materials and devices
- Spectroscopy and Quantum Chemical Studies
- High-Temperature Coating Behaviors
- Ionic liquids properties and applications
- Nanoplatforms for cancer theranostics
- Endoplasmic Reticulum Stress and Disease
- Advanced Thermoelectric Materials and Devices
- 2D Materials and Applications
- E-commerce and Technology Innovations
- Ga2O3 and related materials
- Nanowire Synthesis and Applications
- Heat shock proteins research
- Transition Metal Oxide Nanomaterials
- Graphene research and applications
Tianjin University
2019-2024
National Center for Nanoscience and Technology
2015-2019
Chinese Academy of Sciences
2019
Supported alloy nanoparticles are prevailing alternative low-cost catalysts for both heterogeneous and electrochemical catalytic processes. Gas molecules selectively interacting with one metal element induces a dynamic structural change of under reaction conditions largely controls their properties. However, such multicomponent dynamic-interaction-controlled evolution, chemical, remains far from clear. Herein, by using state-of-the-art environmental TEM, we directly visualize, in situ at the...
By using in situ aberration-corrected environmental transmission electron microscopy, for the first time at atomic level, dynamic evolution of Cu surface is captured during CO oxidation. Under reaction conditions, activated, typically involving 2-3 layers with formation a reversible metastable phase that only exists catalytic reactions. The distinctive role and O2 activation revealed, which features exposure to lead roughening consequently low-coordinated atoms, while induces...
Bimetallic alloy catalysts show strong structural and compositional dependence on their activity, selectivity, stability. Often referred to as the “synergetic effect” of two metal elements in alloys, detailed dynamic information, structurally chemically, catalyst surface under reaction conditions remains largely elusive. Here, using aberration-corrected environmental transmission electron microscopy, we visualize atomic-scale synergetic activation CuAu a water–gas shift condition. The unique...
Supported metal catalysts experience significant structural evolution during the activation process and reaction conditions, which is critical to achieve a desired active surface interface enabling efficient catalytic processes. However, such dynamic information related mechanistic understandings remain largely elusive owing limitation of real-time capturing under conditions. Here, using in situ environment transmission electron microscopy, we demonstrate atomic-scale model Cu/ZnO catalyst...
In heterogeneous catalysis, specific surface planes of metals and/or supports have a prominent effect on the catalytic processes, i.e., adsorption, dissociation reactants, and electron transfer behaviors. addition, oxide direct impact shape dispersion metal particles through metal–support interaction. Herein, we synthesized ZnO nanoplates (p-ZnO) exposing mostly polar surfaces nanorods (r-ZnO) non-polar used them as to prepare Au/ZnO catalysts. Then, plane was demonstrated by employing CO...
Atomic-scale interaction of water vapor with metal surfaces beyond surface adsorption under technologically relevant conditions remains mostly unexplored. Using aberration-corrected environmental transmission electron microscopy, we reveal the dynamic activation Cu by ${\mathrm{H}}_{2}\mathrm{O}$ at elevated temperature and pressure. We find a structural transition from flat to corrugated for Cu(011) low water-vapor Increasing pressure leads reaction dissociated ${\mathrm{H}}_{2}\mathrm{O}$,...
Abstract By using in situ aberration‐corrected environmental transmission electron microscopy, for the first time at atomic level, dynamic evolution of Cu surface is captured during CO oxidation. Under reaction conditions, activated, typically involving 2–3 layers with formation a reversible metastable phase that only exists catalytic reactions. The distinctive role and O 2 activation revealed, which features exposure to lead roughening consequently low‐coordinated atoms, while induces...
Abstract Metal–support interaction (MSI) provides great possibilities to tune the activity, selectivity, and stability of heterogeneous catalysts. Herein, Au/ZnO catalyst is prepared by commercial ZnO chloroauric acid, structure evolution pretreated H 2 O gas at varied temperature investigated provide mechanistic insights MSI. It found that treatment 300 °C above can induce formation both x overlayer bulk Au–Zn alloy. In contrast, form 500 without also revealed dynamically stable...
Inhibition of the heat shock proteins (HSPs) has been considered to be one promising strategies for cancer treatment. However, developing highly effective HSP inhibitors remains a challenge. Recent studies on evolutionarily distinct functions between intracellular and extracellular HSPs (eHSPs) trigger new direction with eHSPs as chemotherapeutic targets. Herein, first engineered eHSP nanoinhibitor high effectiveness is reported. The zinc–aspartic acid nanofibers have specific binding...
The initial growth mode of oxide on alloy plays a decisive role in the development protective scales metals and alloys, which is critical for their functionality high temperature applications. However, atomistic mechanisms dictating that remain elusive due to lack direct situ observation nucleation at atomic-scale. Herein, we employed environmental transmission electron microscopy first-principles calculations elucidate atomic process nickel–chromium (Ni–Cr) oxidation. We directly revealed...
The functionalities of two-dimensional (2D) materials are solely determined by their perfect single-layer lattice or precisely stacking multiple planes, which is predominately during growth process. Although the graphene has been successfully achieved on different substrates with a large area up to millimeters, direct visualization atomic-scale in real time still lacks, vital decipher atomistic mechanisms growth. Here, we employ aberration-corrected environmental transmission electron...
Atomic defects are critical to tuning the physical and chemical properties of functional materials such as catalysts, semiconductors, 2D materials. However, direct structural characterization atomic defects, especially their formation annihilation under practical conditions, is challenging yet crucial understanding underlying mechanisms driving defect dynamics, which remain mostly elusive. Here, through in situ imaging by an aberration-corrected environmental transmission electron microscope...
Metal oxidation initiates from surface adsorption to subsurface and bulk reaction through continuous interfacial phase transformation metals oxides. How the initial process affects whole of metal remains largely elusive because lack direct observation evolving interface. Here, in situ atomic-scale environmental TEM observations Cu water vapor, we demonstrate that strain between substrate growing oxide is coupled into continuing chemical determines kinetics. Atomic imaging real time reveals...
Alloy nanocatalysts exhibit enhanced activity, selectivity, and stability mainly due to their versatile phases atomic structures. However, nanocatalysts' "real" functional structures may vary from as-synthesized status the structural chemical changes during activation reaction conditions. Herein, we studied activated CuPd/CeO2 under CO oxidation featuring an atomic-scale phase separation process, resulting in a notable "hysteresis" catalyst performance. Through "identical-location"...