A5100409038- Advancements in Battery Materials
- Ferroelectric and Piezoelectric Materials
- Advanced Battery Materials and Technologies
- Multiferroics and related materials
- Advanced Battery Technologies Research
- Electronic and Structural Properties of Oxides
- Optical Coatings and Gratings
- Microwave Dielectric Ceramics Synthesis
- Smart Grid Energy Management
- Nanofabrication and Lithography Techniques
- Microgrid Control and Optimization
- Acoustic Wave Resonator Technologies
- Photonic and Optical Devices
- Dielectric materials and actuators
- Supercapacitor Materials and Fabrication
- Advancements in Solid Oxide Fuel Cells
- Thermal Expansion and Ionic Conductivity
- Nanowire Synthesis and Applications
- Electric Vehicles and Infrastructure
- Catalytic Processes in Materials Science
- Integrated Energy Systems Optimization
- Image Processing and 3D Reconstruction
- Catalysis and Oxidation Reactions
- Plasma Diagnostics and Applications
- Power Systems and Technologies
Shanxi Medical University
2024
TianjinSino-German University of Applied Sciences
2019-2024
Southern University of Science and Technology
2024
Oak Ridge National Laboratory
2018-2023
Hebei University of Technology
2023
Material Sciences (United States)
2023
Iowa State University
2013-2022
Oak Ridge Associated Universities
2018-2021
Northeastern University
2018-2021
State Key Laboratory of Supramolecular Structure and Materials
2020
Giant electric-field-induced strain of 0.70%, corresponding to a d33 * value 1400 pm V(-1) , is observed in lead-free (Bi1/2 Na1/2 )TiO3 -based polycrystalline ceramic. This comparable the properties single crystals. An situ transmission electron microscopy study indicates that excellent performance originates from phase transitions under applied electric fields.
Abstract Nickel‐rich layered oxide cathodes with the composition LiNi 1− x − y Co Mn O 2 (NCM, (1− ) ≥ 0.6) are under intense scrutiny recently to contend commercial 0.8 0.15 Al 0.05 (NCA) for high‐energy‐density batteries electric vehicles. However, a comprehensive assessment of their electrochemical durability is currently lacking. Herein, two in‐house cathodes, and 0.7 , investigated in high‐voltage graphite full cell over 1500 charge‐discharge cycles (≈5–10 year service life vehicles)....
This work reports a new strategy toward the design of class supported catalysts with intrinsic high-temperature stabilities through entropy maximization.
Relaxor dielectric ceramic capacitors are very attractive for high-power energy storage. However, the low breakdown strength severely restricts improvements to storage density and practical application. Here, a strategy of designing small grain sizes abundant amorphous boundaries is proposed improve properties under guidance phase field theory. 0.925(K0.5Na0.5)NbO3–0.075Bi(Zn2/3(Ta0.5Nb0.5)1/3)O3 (KNN–BZTN) relaxor ferroelectric taken as an example verify our strategy. The KNN–BZTN ceramics...
The large-voltage hysteresis remains one of the biggest barriers to optimizing Li/Na-ion cathodes using lattice anionic redox reaction, despite their very high energy density and relative low cost. Very recently, a layered sodium cathode Na2Mn3O7 (or Na4/7Mn6/7□1/7O2, □ is vacancy) was reported have reversible oxygen with much suppressed voltage hysteresis. However, structural electronic origin this small-voltage has not been well understood. In article, through systematic studies ex situ/in...
Both high contrast and transmittance are preferred for optical polarizers. To achieve aluminum nanowire-grid polarizers, a narrow linewidth is required. In this letter, polarizers with 30-nm-wide 200nm depth were fabricated by UV-nanoimprint lithography, which leads to ultrahigh transmittance. contrast, the authors nanowire structures on both sides of glass wafers. An extremely up 10 000:1 was achieved, in visible range, along good 83%–87% double-side
Isotropic polycrystalline ferroelectric ceramics have to be electrically poled develop a net macroscopic polarization and hence piezoelectricity. It is well accepted that sufficient poling can only realized under an electric field much higher than the coercive field. In this study, we observed in (Bi1/2Na1/2)TiO3-BaTiO3 large piezoelectricity at fields far below measured Using situ transmission electron microscopy, such unusual behavior, interpreted with alignment of polar nanodomains...
Electric fields are known to favor long-range polar order through the aligning of electric dipoles in relation Coulomb's force. Therefore, it would be surprising observe a disordered state induced from an ordered by fields. Here we show such unusual phenomenon polycrystalline oxide where induce ferroelectric-to-relaxor phase transition. The nonergodic relaxor with appears as intermediate under during polarization reversal ferroelectric phase. Using phenomenological theory, underlying...
Neutron and electron spectroscopy reveal diffusion behavior of individual ions in lithium garnets, paving the way towards high-performance aqueous batteries.
Non-textured polycrystalline [Bi1/2(Na0.8K0.2)1/2](Ti1−xTax)O3 ceramics are fabricated and their microstructures electrical properties characterized. Transmission electron microscopy reveals the coexistence of rhombohedral R3c tetragonal P4bm phases in form nanometer-sized domains [Bi1/2(Na0.8K0.2)1/2]TiO3 with low Ta concentration. When composition is x = 0.015, electrostrain found to be highly asymmetric under bipolar fields ±50 kV/cm. A very large value 0.62% observed this ceramic,...
Methane conversion has received renewed interest due to the rapid growth in production of shale gas. combustion for power generation and transportation is one alternatives methane utilization. However, complete critical minimize negative environmental effects from unburned methane, whose noxious effect 25 times greater than that CO2. Although perovskite catalysts have high thermal stability, their low activities prevent them being utilized on a commercial basis. In this work, we show impact...
Li phosphorus oxynitride (LiPON) is one of a very few solid electrolytes that have demonstrated high stability against metal and extended cyclability with Coulombic efficiency for all solid-state batteries (ASSBs). However, theoretical calculations show LiPON reacts metal. Here, we utilize in situ electron microscopy to observe the dynamic evolutions at LiPON–Li interface upon contacting under biasing. We reveal thin layer (∼60 nm) develops contact. This composed conductive binary compounds...
Carbon dots (CDs), as a new kind of fluorescent nanomaterials, show great potential for application in several fields due to their unique nano-size effect, easy surface functionalization, controllable photoluminescence, and excellent biocompatibility. Conventional preparation methods CDs typically involve top-down bottom-up approaches. Doping is major step forward design methodology. Chemical doping includes both non-metal metal doping, which an effective strategy modulating the fluorescence...
Hydrogen as an efficient energy carrier is environmentally benign fuel of the future. Solar-powered water splitting, using semiconductor photocatalysts, generation method hydrogen where excellent photocatalysts are key factors. In this work, we investigate silicon nanowires (SiNWs) for splitting. By utilizing density functional theory calculations, demonstrated that SiNWs terminated with suitable H and Cl surface coverage should be a promising photocatalyst purpose. The interaction between...
The microscopic mechanism for polarization fatigue in ferroelectric oxides has remained an open issue several decades the condensed matter physics community. Even though numerous models are proposed, a consensus yet to be reached. Since reversal is realized through domains, their behavior during electric cycling critical elucidating microstructural origin deteriorating performance. In this study, field situ transmission electron microscopy employed first time reveal domain dynamics at...
The phase transition sequence in PbZrO3-based ceramics can be readily altered by chemical modification. In Pb0.99Nb0.02[(Zr0.57Sn0.43)0.92Ti0.08]0.98O3 (PNZST 43/8/2), the is ferroelectric–antiferroelectric–paraelectric during heating, while Pb0.99Nb0.02(Zr0.85Sn0.13Ti0.02)0.98O3 13/2/2), it antiferroelectric–ferroelectric–paraelectric heating. electrocaloric effect associated with antiferroelectric ↔ ferroelectric studied both via indirect measurement. PNZST 43/8/2 observed to display a...
Polarization-field double hysteresis loops have hardly ever been observed at room temperature in polycrystalline NaNbO3, one of a few lead-free antiferroelectric compounds. In this Letter, it is shown that the exposure modified NaNbO3 ceramic to bipolar electric fields ±160 kV/cm 100°C can preserve temperature. These still be after 125 days aging with some decay maximum polarization. Frequency dependence analysis suggests originate from ↔ ferroelectric phase transition, not charged defects.
The effect of Ba content on the stress sensitivity antiferroelectric to ferroelectric phase transition in ( Pb 0.94− x La 0.04 )[( Zr 0.60 Sn 0.40 ) 0.84 Ti 0.16 ] O 3 ceramics is investigated through monitoring electric field‐induced polarization and longitudinal strain under compressive prestresses. It found that incorporation significantly suppresses transition, as manifested by slight decreases prestresses up 100 MPa maximum P m ). energy storage density even increased mechanical...
With the global warming and climate change, low-carbon power system has attracted increasing attention. A optimal dispatch model incorporating carbon capture storage technology uncertainty of wind is proposed. An accurate calculation dioxide emission established, tax mechanism incorporated into traditional economic taking account economy production. The effectiveness proposed method verified by simulation results modified IEEE 24-bus system. case study shows that can significantly reduce...