A5035314482- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Advanced Battery Technologies Research
- Fuel Cells and Related Materials
- Supercapacitor Materials and Fabrication
- Advanced Electron Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Extraction and Separation Processes
- Quantum Dots Synthesis And Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photocatalysis Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Machine Learning in Materials Science
- Iron oxide chemistry and applications
- CO2 Reduction Techniques and Catalysts
- Semiconductor materials and devices
- nanoparticles nucleation surface interactions
- Copper-based nanomaterials and applications
- Electron and X-Ray Spectroscopy Techniques
- Conducting polymers and applications
- Graphene research and applications
- Nanomaterials for catalytic reactions
Xiamen University
2016-2025
Collaborative Innovation Center of Chemistry for Energy Materials
2016-2024
Tan Kah Kee Innovation Laboratory
2021-2024
Xiamen University of Technology
2018
Lawrence Berkeley National Laboratory
2012-2017
Pacific Northwest National Laboratory
2010-2013
Guilin University of Electronic Technology
2013
Vanung University
2013
University of Rhode Island
1995
The growth of colloidal nanocrystal architectures by nanoparticle attachment is frequently reported as an alternative to the conventional monomer attachment. However, mechanism whereby proceeds microscopically remains unclear. We report real-time transmission electron microscopy (TEM) imaging solution Pt(3)Fe nanorods from building blocks. Observations revealed winding polycrystalline chains shape-directed followed straightening and orientation shape corrections yield single-crystal...
An understanding of how facets a nanocrystal develop is critical for controlling shape and designing novel functional materials. However, the atomic pathways facet development are mostly unknown because lack direct observation. We report imaging platinum nanocube growth in liquid cell using transmission electron microscopy with high spatial temporal resolution. The rates all low index similar until {100} stop growth. continuous rest leads to nanocube. Our calculation shows that much lower...
Star performance: The shape and surface structure of star-shaped gold nanoparticles (NPs) bounded by (331) vicinal high-index facets, now synthesized for the first time, can be tuned varying water content in deep eutetic solvent. results confirm that Au NPs exhibit superior activity electrocatalytic reduction H2O2. ability to tune offers insight into structure–functionality relationships.
PtAu/graphene nanocomposites with high activity toward formic acid oxidation were synthesized in the presence of poly(diallyldimethylammonium chloride), which not only acted as "nanoreactors" for preparation PtAu alloy NPs but also facilitated uniform loading on graphene nanosheets.
We report direct visualization of electrochemical lithiation and delithiation Au anodes in a commercial LiPF6/EC/DEC electrolyte for lithium ion batteries using transmission electron microscopy (TEM). The inhomogeneous lithiation, metal dendritic growth, decomposition, solid-electrolyte interface (SEI) formation are observed situ. These results shed lights on strategies improving electrode design reducing short-circuit failure the performance batteries.
Here we report that poly(diallyldimethylammonium chloride) (PDDA) acts as both a reducing agent and stabilizer to prepare soluble graphene nanosheets from graphite oxide. The results of transmission electron microscopy, X-ray diffraction, photoelectron spectroscopy, atomic force Fourier transform infrared indicated oxide was successfully reduced which exhibited single-layer structure high dispersion in various solvents. reaction mechanism for PDDA-induced reduction exfoliated proposed....
Nanoscale inorganic wheel-shaped structures are one of the most striking types molecular aggregations. Here, we report synthesis a gigantic lanthanide wheel cluster containing 140 Gd3+ atoms. As largest reported thus far, {Gd140} features an attractive wheel-like structure with 10-fold symmetry. The nanoscopic possesses diameter 6.0 nm and displays high stability in solution, which allows direct visualization by scanning transmission electron microscopy. newly discovered represents new member family.
Lithium sulfide (Li2S) is an attractive cathode material with a high theoretical specific capacity (1166 mAh g(-1)). However, the poor cycle life and rate capability have remained significant challenges, preventing its practical application. Here, Li2S spheres size control been synthesized for first time, CVD method converting them into stable carbon-coated core-shell (Li2S@C) particles has successfully employed. These Li2S@C protective conductive carbon shells show promising capacities...
Increasing the density of surface Fe–N 4 sites in Fe–N–C materials is pivotal for enhancing kinetics oxygen reduction reaction (ORR) proton exchange membrane fuel cells (PEMFCs).
Element doping/substitution has been recognized as an effective strategy to enhance the structural stability of layered cathodes. However, abundant substitution studies not only lack a clear identification sites in material lattice, but rigid interpretation transition metal (TM)-O covalent theory is also sufficiently convincing, resulting proposals being dragged into design blindness. In this work, taking Li1.2Ni0.2Mn0.6O2 prototype, intense correlation between "disordered degree" (Li/Ni...
Abstract The morphology and active site engineering of electrocatalysts is an efficient strategy to improve the intrinsic activity selectivity electrocatalytic CO 2 reduction. Here ultralong thin Bi nanobelts (Bi‐NBs) are fabricated, which feature a high edge‐to‐facet ratio high‐degree connectivity inherited from ultrahigh‐aspect‐ratio crystalline bismuth−organic hybrid nanobelts, through cathodically in situ reconstruction process. unique nanostructure Bi‐NBs leads significantly enhanced...
To achieve the Fe-N-C materials with both high activity and durability in proton exchange membrane fuel cells, attack of free radicals on Fe-N4 sites must be overcome. Herein, we report a strategy to effectively eliminate at source mitigate degradation by anchoring CeO2 nanoparticles as scavengers adjacent (Scaad-CeO2 ) sites. Radicals such ⋅OH HO2 ⋅ that form can instantaneously eliminated , which shortens survival time regional space their damage. As result, Fe-NC/Scaad-CeO2 achieved ∼80 %...
Intelligent utilization of the anionic redox reaction (ARR) in Li-rich cathodes is an advanced strategy for practical implementation next-generation high-energy-density rechargeable batteries. However, due to intrinsic complexity ARR (e.g., nucleophilic attacks), instability cathode-electrolyte interphase (CEI) on a cathode presents more challenges than typical high-voltage cathodes. Here, we manipulate CEI interfacial engineering by introducing all-fluorinated electrolyte and exploiting its...
Abstract In pursuing cheap and effective oxygen reduction catalysts, the Fe/N/C system emerges as a promising candidate. Nevertheless, structural transformations of starting materials into Fe- N-doped carbon catalysts remains poorly characterized under pyrolytic conditions. Here, we explore evolution Fe species track formation Fe–N 4 site development by employing diverse in-situ diagnostic techniques. In-situ heating microscopy reveals initial FeO x nanoparticles subsequent internal...
Screw-like PdPt nanowires exhibit enhanced performance towards MOR and EGOR attributed to the unique structure synergetic effect of catalysts.
Liquid cell transmission electron microscopy (TEM) has attracted significant interest in recent years. With nanofabricated liquid cells, it been possible to image through liquids using TEM with subnanometer resolution, and many previously unseen materials dynamics have revealed. applied areas of research, ranging from chemistry physics, science, biology. So far, topics study include nanoparticle growth assembly, electrochemical deposition lithiation for batteries, tracking manipulation...
An understanding of nanocrystal growth mechanisms is significant importance for the design novel materials. The development liquid cells transmission electron microscopy (TEM) has enabled direct observation nanoparticle in a phase. By tracking single particle trajectories with high spatial resolution, have been revealed. In recent years, there an increasing interest cell TEM and its applications include real time imaging nanoparticles, biological materials, liquids, so on. This paper reviews...
We study solution growth of platinum iron nanocrystals in situ a liquid cell by using transmission electron microscopy. By varying the oleylamine concentration, we observed that nanoparticle follows different trajectories with diverse shape evolution. With 20% oleylamine, three stages were observed: (i) nucleation and nanoparticles precursor solution; (ii) nanowire formation shape-directed attachment; (iii) breakdown or shrinkage nanowires into individual large size distribution. 30% similar...