Here, a new idea was proposed for template-free synthesis of hierarchical m-ZrO2 nanorods and "their" possible formation mechanism based on a series of chemical reactions by simple hydrothermal method. The tradition...
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Here, a new idea was proposed for template-free synthesis of hierarchical m-ZrO2 nanorods and "their" possible formation mechanism based on a series of chemical reactions by simple hydrothermal method. The traditional preparation methods of hierarchical ZrO2 nanorods involved inexpensive equipment, complicated process, and high production cost. The as-synthesized products composed of many nanorods with 180-200 nm in diameter and 5-7 μm in length. The fi nal product after annealing involved hierarchical monoclinic ZrO2(m-ZrO2) nanorods, namely, the big nanorod was made up of many small nanorods with 40-50 nm in diameter and 500-600 nm in length. The experimental results were useful in understanding the chemical properties of ZrB2 and ZrO2 and the design of the derivatives for m-ZrO2 nanomaterials.
With global freshwater scarcity and increasing water pollution due to industrial and agricultural activities, there is an urgent need for sustainable, high-performance water treatment materials. Conventional filtratio...
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Mechanical energy produced by human motion is ubiquitous,continuous,and usually not utilized,making it an attractive target for sustainable electricity-harvesting *** this study,flexible magnetic-Juncus effusus(M-JE)f...
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Mechanical energy produced by human motion is ubiquitous,continuous,and usually not utilized,making it an attractive target for sustainable electricity-harvesting *** this study,flexible magnetic-Juncus effusus(M-JE)fibers were prepared from plant-extracted three-dimensional porous Juncus effusus(JE)fibers decorated with polyurethane and magnetic *** M-JE fibers were woven into fabrics and used for mechanical energy harvesting through electromagnetic *** M-JE fabric and induction coil,attached to the human wrist and waist,yielded continuous and stable voltage(2 V)and current(3 mA)during *** proposed M-JE fabric energy harvester exhibited good energy harvesting potential and was capable of quickly charging commercial capacitors to power small electronic *** proposed M-JE fabric exhibited good mechanical energy harvesting performance,paving the way for the use of natural plant fibers in energy-harvesting fabrics.
The removal of Cr(VI) from wastewater through adsorption is beneficial for both human health and the environment. Current adsorption materials often suffer from a small specific surface area and a single pore structur...
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A series of new microwave dielectric ceramics Ba3-nLa1+nTinNb3-nO12 (n=0,1,2) were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics we...
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A series of new microwave dielectric ceramics Ba3-nLa1+nTinNb3-nO12 (n=0,1,2) were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction, scanning electron microscope, and microwave dielectric properties measurements. These samples were identified as single phase and adopted A4B3O12-type cation-deficient hexagonal perovskite structure, which can be described as consisting of identical perovskite-like blocks, three corner-sharing BO6 octahedra thick, separated by layers of vacant octahedral. These ceramics have high dielectric constants in the range of 48-42, high quality factors (Q×f) up to 38 000 GHz, and low temperature coefficient of resonant frequencies (τf) in the range of (-40-+6)×10-6℃-1. With increasing content of La and Ti, the dielectric constants slightly decrease butτf gradually increases.
The unsatisfactory conductivity and large volume variation severely handicap the application of SnO2in sodium-ion batteries(SIBs). Herein, we design unique three-layer structured SnO2@C@TiO2hollow spheres to tackle ...
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The unsatisfactory conductivity and large volume variation severely handicap the application of SnO2in sodium-ion batteries(SIBs). Herein, we design unique three-layer structured SnO2@C@TiO2hollow spheres to tackle the above-mentioned issues. The hollow cavity affords empty space to accommodate the volume variation of SnO2, while the C and TiO2protecting shells strengthen the structural integrity and enhances the electrical conductivity. As a result, the three-layer structured SnO2@C@TiO2hollow spheres demonstrate enhanced Na storage performances. The SnO2@C@TiO2manifests a reversible capacity two times to that of pristine SnO2hollow spheres. In addition, Ex situ XRD reveals highly reversible alloying and conversion reactions in SnO2@C@TiO2hollow spheres. This study suggests the introduction of a hollow cavity and robust protecting shells is a promising strategy for constructing SIB anode materials.
Lithium metal is a promising anode material owing to its very low electrochemical potential and ultrahigh specific ***,the growth of lithium dendrites could result in a short lifespan,low coulombic efficiency,and pote...
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Lithium metal is a promising anode material owing to its very low electrochemical potential and ultrahigh specific ***,the growth of lithium dendrites could result in a short lifespan,low coulombic efficiency,and potential safety hazards during the progress of lithium plating/*** factors drastically hinder its application in lithium metal *** review focuses on the use of three dimensional(3D)porous host frameworks to improve Li plating/stripping behaviors,accommodate the change in volume,and suppress or block lithium dendrite *** 3D porous frameworks,including the conductive carbon-based,metal-based,and lithiophilic inorganic-compound frameworks are introduced and summarized in *** particular functions,relative developments,and optimized strategies of various 3D porous frameworks for lithium deposition/dissolution behaviors are ***,the challenges and promising developments in the field of Li metal anodes will be discussed at the end of this review.
Under the vision of 'carbon peaking and carbon neutrality',the global energy system is facing a deep *** a clean energy with the potential to achieve zero carbon emissions,hydrogen energy will undoubtedly play...
Under the vision of 'carbon peaking and carbon neutrality',the global energy system is facing a deep *** a clean energy with the potential to achieve zero carbon emissions,hydrogen energy will undoubtedly play an important ***-energy-driven photo catalytic reactions can decompose water to produce hydrogen and reduce carbon dioxide to produce solar fuels.
ZnO hexagonal prism crystals were synthesized from ZnO powders by microwave heating in a short time (within 20 min) without any metal catalyst or transport agent. Zinc oxide raw materials were made by evaporating fr...
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ZnO hexagonal prism crystals were synthesized from ZnO powders by microwave heating in a short time (within 20 min) without any metal catalyst or transport agent. Zinc oxide raw materials were made by evaporating from the high-temperature zone in an enclosure atmosphere and crystals were grown on the self-source substrate. The inherent asymmetry in microwave heating provides the temperature gradient for crystal growth. Substrate and temperature distribution in the oven show significant effects on the growth of the ZnO crystal. The morphologies demonstrate that these samples are pure hexagonal prism crystals with maximum 80 lain in diameter and 600 lure in length, which possess a well faceted end and side surface. X-ray diffraction (XRD) reveals that these samples are pure crystals. The photoluminescence (PL) exhibits strong ultraviolet emission at room temperature, indicating potential applications for short-wave light-emitting photonic devices.
A Gleeble-3500 thermal simulator was employed to conduct hot compression tests on AA6061 aluminum alloy containing 0.15 wt% yttrium (Y). The hot deformation behavior and microstructural evolution were systematically i...
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