Recent progress and perspectives on silicon anode:Synthesis and prelithiation for LIBs energy storage

The ever-increasing environmental/energy crisis as well as the rapid upgrading of mobile devices had stimulated intensive research attention on promising alternative energy storage and conversion devices.Among these devices,alkali metal ion batteries,such as lithium-ion batteries(LIBs) had attracted increasing research attention due to its several advantages including,environmental friendliness,high power density,long cycle life and excellent reversibility.It had been widely used in consumer electronics,electric vehicles,and large power grids et ac.Silicon-based(silicon and their oxides,carbides) anodes had been widely studied.Its several advantages including low cost,high theoretical capacity,natural abundance,and environmental friendliness,which shows great potential as anodes of LIBs.In this review,we summarized the recently progress in the synthetic method of silicon matrix composites.The empirical method for prelithiation of silicon-based materials were also provided.Further,we also reviewed some novel characterization methods.Finally,the new design,preparation methods and properties of these nano materials were reviewed and compared.We hoped that this review can provide a general overview of recent progress and we briefly highlighted the current challenges and prospects,and will clarify the future trend of silicon anode LIBs research.

Single-/fused-band dual-mode mid-infrared imaging with colloidal quantum-dot triple-junctions

Image data acquired with fused multispectral information can be used for effective identification and navigation owing to additional information beyond human vision,including thermal distribution,night vision,and molecular composition.However,the construction of photodetectors with such capabilities is hindered by the structural complexity arising from the integration of multiple semiconductor junctions with distinct energy gaps and lattice constants.In this work,we develop a colloidal quantum-dot dual-mode detector capable of detecting,separating,and fusing photons from various wavelength ranges.Using three vertically stacked colloidal quantum-dot homojunctions with alternating polarity,single-band short-wave infrared imaging and fused-band imaging(short-wave and mid-wave infrared)can be achieved with the same detector by controlling bias polarity and magnitude.The dual-mode detectors show detectivity up to 8×10^(10)Jones at the fused-band mode and 3.1×10^(11)Jones at the single-band mode,respectively.Without image post-processing algorithms,the dual-mode detectors could provide both night vision and thermal information-enhanced night vision imaging capability.To the best of our knowledge,this is the first colloidal quantum-dot detector that can achieve such functionality.The operation mode can be changed at a high frequency up to 1.7 MHz,making it possible to achieve simultaneously dual-mode imaging and remote temperature sensing.

Polycyclic aromatic hydrocarbon:environmental sources,associations with altered lung function and potential mechanisms

Polycyclic aromatic hydrocarbon(PAH)molecules are a large group of organic compounds with two or more fused benzene rings arranged in various confgurations."To date,hundreds of PAHs have been identified.PAHs are widespread environmental contaminants formed as a result of incomplete combustion of carbonaceous materials in both natural and anthropogenic process.Compared to the natural sources,such as volcanic eruptions and wild fires,anthropogenic sources,such as industrial processes,cigarette smoke,vehicular exhaust,residential heating fuels and charcoal-grilled and flame-broiled food,make a larger contribution to the generation of atmospheric PAHs.'Through inhalation,ingestion and dermal contract,PAHs from all sources can easily be absorbed in the body and further metabolized and excreted in urine.The urinary monohydroxylated PAH(OH-PAH)has been widely considered as a biomarker to represent individual PAH exposure levels in many studies.

Colloidal quantum-dot light emitting diodes with bias-tunable color

Although the performance of quantum-dot-based light emitting diodes(QLEDs)has been significantly enhanced over the past years,conventional full-color QLED displays still rely on the side-by-side pattern techniques of red(R)/green(G)/blue(B)quantum dots(QDs).Such lateral integration of multi-color pixels imposes technological difficulty in the development of high-resolution displays due to limited pixel density and fill factors.Herein,we demonstrate the development of full-color QLEDs with bias-tunable emission spectra by engineering mixed R/G/B QDs as light emitting layers.In Commission Internationale de l'Eclairage(CIE)chromaticity coordinates,QLEDs with bias-tunable color exhibit wide color variation ranging from red(0.649,0.330)to green(0.283,0.305)to blue(0.255,0.264)upon increasing voltages and can be tuned to emit white light(0.316,0.325).More importantly,the fabricated multi-color QLEDs show high luminance approaching 103cd m^(-2)and superior external quantum efficiency of 13.3%.Benefitting from the wide spectral tunability and light emitting efficiency,we believe the proposed multi-color QLEDs have great application prospects for both displays and lighting.