A5033811092- Graphene research and applications
- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- 2D Materials and Applications
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Advanced Battery Technologies Research
- MXene and MAX Phase Materials
- Advanced Materials and Mechanics
- Advanced Photocatalysis Techniques
- Thermal properties of materials
- Advanced Sensor and Energy Harvesting Materials
- TiO2 Photocatalysis and Solar Cells
- Diamond and Carbon-based Materials Research
- Advanced battery technologies research
- Transition Metal Oxide Nanomaterials
- Force Microscopy Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Carbon Nanotubes in Composites
- Nanowire Synthesis and Applications
- Topological Materials and Phenomena
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- Porphyrin and Phthalocyanine Chemistry
- Thermal Expansion and Ionic Conductivity
City University of Hong Kong
2022-2024
University of Hong Kong
2024
Max Planck Institute for Solid State Research
2024
Inner Mongolia University of Science and Technology
2015-2024
National Center for Nanoscience and Technology
2016-2023
University of Science and Technology of China
2016-2022
Chinese Academy of Sciences
1999-2019
Suzhou Institute of Nano-tech and Nano-bionics
2014-2017
L'Alliance Boviteq
2015
Suzhou Research Institute
2015
Nitrogen-doped graphene (NG) is a promising conductive matrix material for fabricating high-performance Li/S batteries. Here we report simple, low-cost, and scalable method to prepare an additive-free nanocomposite cathode in which sulfur nanoparticles are wrapped inside the NG sheets (S@NG). We show that Li/S@NG can deliver high specific discharge capacities at rates, is, ∼1167 mAh g–1 0.2 C, ∼1058 0.5 ∼971 1 ∼802 2 ∼606 5 C. The cells also demonstrate ultralong cycle life exceeding 2000...
An in situ electrochemical scanning electronic microscopy method is developed to systematically study the lithium plating/stripping processes liquid electrolytes. The results demonstrate that dendrite growth speed and mechanism greatly affected by additives ether-based electrolyte. As a service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical...
Hierarchical structures enable high-performance power sources. We report here the preparation of vertically aligned carbon nanotubes directly grown on nanofibers (VACNTs/CNFs) by combining electrospinning with pyrolysis technologies. The structure and morphology VACNTs/CNFs could be precisely tuned controlled adjusting percentage reactants. desired not only possess high electric conductivity for efficient charge transport but also increase surface area accessing more electrolyte ions. When...
Nanoblisters such as nanobubbles and nanotents formed by two-dimensional (2D) materials have been extensively exploited for strain engineering purposes they can produce self-sustained, nonuniform in-plane strains through out-of-plane deformation. However, deterministic measure control of fields in these systems are challenging because the atomic thinness unconventional interface behaviors 2D materials. Here, we experimentally characterize a simple unified power law profiles variety graphene...
Black phosphorus (BP) has been considered as a promising two‐dimensional (2D) semiconductor beyond graphene owning to its tunable direct bandgap and high carrier mobility. However, the hole‐transport‐dominated characteristic limits application of BP in versatile electronics. Here, we report stable complementary metal oxide (COMS) compatible electron doping method for BP, which is realized with strong field‐induced effect from K + center silicon nitride (Si x N y ). An obvious change pristine...
Ultralong cycle-life and stable Li2S-C/Li cells can be achieved by using highly nitridated graphene controlling both recharge capacity voltage. As a service to our authors readers, this journal provides supporting information supplied the authors. Such materials are peer reviewed may re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising from (other than missing files) should addressed Please note: The publisher is responsible content functionality...
Controlling, and in many cases minimizing, friction is a goal that has long been pursued history. From the classic Amontons-Coulomb law to recent nanoscale experiments, steady-state found be an inherent property of sliding interface, which typically cannot altered on demand. In this work, we show graphene sheet can tuned reversibly by simple mechanical straining. particular, applying tensile strain (up 0.60%), are able achieve superlubric state (coefficient nearly 0.001) suspended graphene....
Controlling the interlayer twist angle offers a powerful means for tuning electronic properties of two-dimensional (2D) van der Waals materials. Typically, electrical conductivity would increase monotonically with decreasing owing to enhanced coupling between adjacent layers. Here, we report nonmonotonic angle-dependent vertical across interface bilayer graphene low angles. More specifically, enhances gradually up crossover at θc ≈ 5°, and then it drops notably upon further decrease in...
Abstract The layer‐by‐layer stacked van der Waals structures (termed vdW hetero/homostructures) offer a new paradigm for materials design—their physical properties can be tuned by the vertical stacking sequence as well adding mechanical twist, stretch, and hydrostatic pressure to atomic structure. In particular, simple twisting of two layers graphene form uniform ordered Moiré superlattice, which effectively modulate electrons lead discovery unconventional superconductivity strong...
Abstract Monolayer two-dimensional (2D) materials possess excellent in-plane mechanical strength yet extremely low bending stiffness, making them particularly susceptible to instability, which is anticipated have a substantial impact on their physical functionalities such as 2D-based Micro/Nanoelectromechanical systems (M/NEMS), nanochannels, and proton transport membrane. In this work, we achieve quantitatively tuning instability in suspended 2D including monolayer graphene MoS 2 by...
Conventionally, tuning materials' properties can be done through strategies such as alloying, doping, defect engineering, and phase while in fact mechanical straining another effective approach. In particular, elastic strain engineering (ESE), unlike conventional mainly based on epitaxial growth, allows for continuous reversible modulation of material by loading/unloading. The exceptional intrinsic (including elasticity strength) two-dimensional (2D) materials make them naturally attractive...
Abstract Blisters can form spontaneously when transferring 2D materials on a substrate because of the small molecules trapped at interface. Though extensive works have revealed characteristic aspect ratio these blisters by neglecting bending effect layer, how comes into play as layer number increases has not been fully understood. Here, simply measuring profiles formed transferred multilayer graphene and MoS 2 sheets, variable transition their shape from constant to dome curvature are...
Three-dimensional (3D) nanostructures enable high-energy storage devices. Here we report a 3D manganese oxide nanospike (NSP) array electrode fabricated by anodization and subsequent electrodeposition. All-solid-state asymmetric supercapacitors were assembled with the Al@Ni@MnOx NSP as positive electrode, chemically converted graphene (CCG) negative Na2SO4/poly(vinyl alcohol) (PVA) polymer gel electrolyte. Taking advantage of different potential windows CCG electrodes, supercapacitor showed...
High energy density lithium sulfur batteries with 804 Wh/kg were reported based on sheet-like Li<sub>2</sub>S@C composites the assistance of nitrogen doped carbon nanotube film.
Assembling monolayers into a bilayer system unlocks the rotational free degree of van der Waals (vdW) homo/heterostructure, enabling building twisted graphene (tBLG) which possesses novel electronic, optical, and mechanical properties. Previous methods for preparation homo/heterstructures inevitably leave polymer residue or hexagonal boron nitride (h-BN) mask, usually obstructs measurement intrinsic surface properties tBLG. Undoubtedly, to fabricate designable tBLG with clean interface is...
Abstract Although layered van der Waals (vdW) materials involve vast interface areas that are often subject to contamination, vdW interactions between layers may squeeze interfacial contaminants into nanopockets. More intriguingly, those nanopockets could spontaneously coalesce larger ones, which easier be squeezed out the atomic channels. Such unusual phenomena have been thought of as an Ostwald ripening process is driven by capillarity confined liquid. The underlying mechanism, however,...
The “flower-like” vanadium pentoxide hierarchical structure assembled from ultrathin nanosheets is a promising electrode material for high-rate and long-cycle-life lithium-ion batteries.
A Li2S electrode is a very promising cathode for Li-ion batteries. However, the high voltage needed to activate Li/Li2S cells represents challenging problem. Here, we report first time mesoporous Li2S-C nanofiber composite with 72 wt% Li2S. The assembled showed low and stable plateau of 2.51 V charge can deliver initial discharge capacity ∼800 mA h g(-1).
Abstract In this study, we report the polymer-based graphene foams through combination of bottom-up assembly and simple triaxially buckled structure design. The resulting not only effectively transfer functional properties graphene, but also exhibit novel negative Poisson’s ratio (NPR) behaviors due to presence structure. Our results show that after introduction structure, improvement in stretchability, toughness, flexibility, energy absorbing ability, hydrophobicity, conductivity,...