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Synergistic etching and intercalation enables ultrathin Ti_(3)C_(2)T_(x)and Nb_(2)CT_(x)MXene nanosheets

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Rare Metals 2023年第4期42卷 1175-1185页

作者： Qian-Qian Xiong Tahir Muhmood Cheng-xiao Zhao Jing-San Xu xiao-fei yang College of Science Nanjing Forestry UniversityNanjing210037China School of Chemistry and Physics Science and Engineering FacultyQueensland University of TechnologyBrisbaneQLD4001Australia

Transition metal-containing MXene has shown great potential in the promising research fields,and its performance strongly depends on the composition,structure,dimension,and surface ***,rational design and controllable synthesis of ultrathin two-dimensional(2D)MXene nanosheets with uniform surface terminations are of great ***,the use of 2D MXene,particularly in solar-powered photocatalysis and electrocatalysis,is restricted by the formation of thick,multi-layered MXene flakes with a small interlayer spacing produced from the conventional hydrofluoric acid(HF)etching *** this work,we report a few-layer MXene nanosheets by solely employing a mixture of lithium fluoride and hydrochloric acid as the etching *** etching and intercalation technique endows MXene with ultrathin 2D nanostructures;moreover,the use of fluoride salt,rather than harmful HF,offers a safer and environmentally-friendly synthetic route for scalable green production of 2D *** the obtained Ti_(3)C_(2)T_(x)and Nb_(2)CT_(x)nanosheets show a highly efficient photoelectrochemical performance superior to highly stacked MXene *** work highlights a mild,simultaneous etching and delamination strategy for the development of high quality of 2D MXene nanosheets.

关键词： MXene Electrocatalysis Hydrogen evolution reaction(HER) Two-dimensional(2D)nanomaterials

Structure and properties of indium-doped ZnO films prepared by RF magnetron sputtering under different pressures

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Rare Metals 2022年第9期41卷 3239-3243页

作者： Li-Ping Peng A-Ling He Liang Fang xiao-fei yang Research Center of Laser Fusion Chinese Academy of Engineering PhysicsMianyang621900China Department of Applied Physics Chongqing UniversityChongqing400030China Science and Technology Information Center Chinese Academy of Engineering PhysicsMianyang621900China

High conductive and transparent In-doped ZnO thin films were deposited on glass substrates by radio-frequency(RF)magnetron sputtering at 250℃.Argon gas was used as the sputtering gas,and its pressure varies from 0.1 to 4.0 *** influences of deposition pressure on the structural,electrical and optical properties of the films were investigated by means of X-ray diffraction(XRD),scanning electron microscope(SEM)and Hall and transmittance *** optical constant of the films was estimated from transmittance data using a nonlinear programming *** is found that the deposition pressure affects the properties of the films *** film deposited at 2.0 Pa shows the optimal crystal quality with a high transmittance of 85%in the visible range and a low resistivity of 2.4×10^(−3)Ω·cm and can thus be used as a transparent electrode.

关键词： ZnO thin films Transparent conductive oxide Optical constant Magnetron sputtering

Morphological evolution of tunnel tips for aluminum foils during DC etching

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 961-966页

作者： Li-bo Liang Ye-dong He Hong-zhou Song xiao-fei yang xiao-yu Cai School of Materials Science and Engineering University of Science and Technology Beijing Institute of Technology Research and Development of Electronic Aluminium Foil Guangxi Hezhou Guidong Electronics TechnologyCo.Ltd.

The morphologies of tunnel tips in different stages for aluminum foils during DC etching in 1.5 mol/L HC1 solution at 90℃ were observed by field emission scanning electron microscopy （FE-SEM）. A novel model was proposed to describe the morphological evolution of tunnel tips throughout the growth processes. In the pit nucleation stage, the pits vary from the hemispherical to half-cubic shapes due to the activation of pit tips from the center to the edge. During the tunnel growth stage, the pits dissolve toward the depth direction and develop into the tunnels, and their tips remain flat. In the tip passivation stage, as the passivation of tunnel tips speeds up from the edge to the center＇s the tunnel tips change from flat shapes to three-dimensional protrusions. The mechanism may be attributed to the order of activation or passivation on the tunnel tips changed in different stages.

关键词： aluminum corrosion pitting polarization etching electrolytic capacitors

Dynamic manipulation of multimodal emission in Er^(3+)-activated non-core-shell structure for optical thermometry and information security

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Rare Metals 2024年第4期43卷 1702-1712页

作者： Xuan Liu Zi-Xia Lin Yin-Biao Shi xiao-Yan Wang Ming-Ye Ding xiao-fei yang College of Science Nanjing Forestry UniversityNanjing210037China Testing Center Yangzhou UniversityYangzhou225009China

Regulating luminescent dynamics of lanthanide-based luminescent materials via external stimuli is of great significance in the fields of optical thermometry and high-level ***,it is still a huge challenge to realize multimodal emissions with tunable color outputs from a single activator in simple structures via smart dynamic control of photon transition ***,we present a mechanistic strategy to achieve multimodal luminescence of Er^(3+)activators with color-switchable outputs in a non-core-shell *** the control of excitation dynamics(λ_(ex)=980,808,1532,377 nm),the population among the intermediate en ergy levels of Er^(3+)and the interaction between Er^(3+)and Yb^(3+)could be precisely modulated through energy transfer and migration processes,leading to the generation of colortunable multimodal luminescence upon diverse excitation modes(non-steady-state,single-/dual-wavelength steady,thermal activation).Inspired by its special luminescent performance,the as-obtained material exhibits great potential in noncontact thermometry,multimodal anticounterfeiting,and high-capacity information encryption by performing a series of proof-of-concept *** findings might provide a conceptual model to modulate the luminescent dynamics in a simple-structured system for the generation of color-adjustable multimodal emissions,which is convenient for the development of advanced luminescent materials toward versatile cuttingedge applications.

关键词： Lanthanide ions Multimodal emission Upconversion Downshifting Anti-counterfeiting Luminescent thermometry

Effect of tunnel structure on the specific capacitance of etched aluminum foil

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 974-979页

作者： Ning Peng Li-Bo Liang Ye-Dong He Hong-Zhou Song xiao-fei yang xiao-Yu Cai Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Institute of Technology Research and Development of Electronic Aluminum Foil Guangxi Hezhou Guidong Electronics Technology Co. Ltd.

The morphology of etched aluminum foil was observed using scanning electron microscopy, which led to the establishment of a cylindrical model and two merged models, considering the fixed weight loss of etching. The maximum of specific capacitance and the cor- responding optimum values for tunnel sizes at various anodization voltages were predicted. The increased size distribution and taper of tun- nels were demonstrated to decrease the specific capacitance, whereas the addition of polymeric additive into the ttmnel widening solution was demonstrated to increase the capacitance. The formation of merged tunnels on the etched aluminum surface, irrespective of the presence of row-merged tunnels or cluster-merged tunnels, resulted in a dramatic decrease in the specific capacitance. It is concluded that, enhancing the uniformity of turmel size and distribution and avoiding the formation of merged tunnels are the effective approach to achieving the higher capacitance for the tunnel etched and formed aluminum foil.

关键词： aluminum foil pitting corrosion capacitance morphology electrolytic capacitors

Effects of HNO_3 concentration on the pit morphologies of aluminum foil etched in HNO_3–HCl and HNO_3–H_2SO_4–HCl solutions

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International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 70-76页

作者： Quan-xiu Yi Ye-dong He Ning Peng Hong-zhou Song xiao-fei yang xiao-yu Cai Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Institute of Technology Research and Development of Electronic Aluminum Foil Guangxi Hezhou Guidong Electronics Technology Co. Ltd.

In this work, the effects of HNO3 concentration on the pit morphologies of high-cubic-texture aluminum foil etched in HNO3-HCl and HNO3-H2SO4-HCl solutions were investigated. When the aluminum foil was etched in HNO3-HCl solutions, the morphologies of pits transformed from irregular tunnels to typical tunnels （as inverted pyramids） and shallow cuboids as the HNO3 concentration in the etchant solution was increased. However, as the HCl concentration in the etchant solution was increased, the morphologies of pits transformed from shallow cuboids to typical tunnels （as inverted pyramids） and irregular tunnels. When the aluminum foil was etched in n N HNO3-（7.2-n） N H2SO4-0.8 N HCl solutions, the morphologies of the pits transformed from typical tunnels （i.e., the number of sub-tunnels formed on the main tunnels increased） to irregular tunnels （corrugated tnnnels and polyline tunnels） as the HNO3 concentration in the etchant solution was increased. These effects are attributed primarily to corrosion on the （100） and （010） faces of pits being accelerated and to the （001） faces be- ing prone to passivation to different degrees when various concentrations of HNO3 are added to the etchant solutions.

关键词： aluminum foil pitting corrosion morphology passive films

Construction of atomic-level charge transfer channel in Bi_(12)O_(17)C_(l2)/MXene heterojunctions for improved visible-light photocatalytic performance

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Rare Metals 2022年第7期41卷 2405-2416页

作者： Song-Song Cui Xuan Liu Yin-Biao Shi Ming-Ye Ding xiao-fei yang College of Science Nanjing Forestry UniversityNanjing 210037China

Exploring efficient co-catalysts to accurately steer the charge separation of semiconductor photocatalysts is highly desired yet remains ***,we tackle the significant challenge by in situ growing the Bi_(12)O_(17)C_(l2)photocatalyst onto two-dimensional(2D)Cl-terminated Ti_(3)C_(2)MXene to construct 2D/2D heterojunction of Bi_(12)O_(17)C_(l2)and Ti_(3)C_(2).Firstly,2D few-layered Ti_(3)C_(2)MXene with chlorine groups has been successfully syn-thesized by Lewis acidic etching strategy with subsequent ultrasonic *** grafting of chlorine terminations on the surface of MXene serves as nucleating centers and growth platform,resulting in the formation of strong interfacial bonds(Bi-Cl-Ti)between Bi_(12)O_(17)C_(l2)and Ti_(3)C_(2).These strong bonds can facilitate the separation and transfer of photo-generated charge carriers between Bi_(12)O_(17)C_(l2)photocatalyst and Ti_(3)C_(2)*** expec-ted,the photocatalytic degradation rate of Bi_(12)O_(17)C_(l2)/Ti_(3)C_(2)hybrids is 9.7 times higher than that of bare Bi_(12)O_(17)C_(l2)*** work not only exhibits a new design concept to effectively steer the charge separation for photocatalysis,but also gives a reference for constructing efficient MXene-based photocatalytic systems.

关键词： Photocatalysis Ti3C2 MXenes Cocatalyst Schottky junction Heterojunction Charge transfer channels

Lignin-reinforced PVDF electrolyte for dendrite-free quasi-solid-state Li metal battery

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Rare Metals 2024年第3期43卷 1006-1016页

作者： Xin-yang Chen Xue-Jie Gao Han-Yan Wu Yu-Long Liu xiao-fei yang Run-Cang Sun Center for Lignocellulosic Chemistry and Biomaterials College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian116034China Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China School of Chemistry Northeast Normal UniversityChangchun130024China

Quasi-solid-state lithium metal batteries(QSSLMBs)assembled with polyvinylidene fluoride(PVDF)are a promising class of next-generation rechargeable batteries due to their safety,high energy density,and superior interfacial ***,PVDF has a series of inherent drawbacks such as low ionic conductivity,ease of crystallization,and hydrophobic character that leading to poor cell *** tackle these issues,a lignin-reinforced PVDF electrolyte is proposed in this work to solve these drawbacks of PVDF and enhance the comprehensive performance of *** lithophilic polar groups of lignin can promote uniform deposition of Li on the *** with the improved mechanical properties can efficiently prevent Li dendrites penetration through the *** addition,more active sites provided by lignin can also enhance Li^(+)transport and lead to a faster electrochemical reaction *** from the ingenious design,Li symmetric cells with 5%lignin-PVDF quasi-solid-state electrolyte can operate for 900 h at a high current density/capacity of 5 mA·cm^(-2)/5 mAh·cm^(-2),while shortcircuiting occurs after 56 h for the counterpart(pure PVDF).Moreover,a full cell of Li/5%lignin-PVDF/LFP cell demonstrates a high capacity of 96.2 mAh·g^(-1)after 2000 cycles at 10 *** work is expected to open up promising opportunities to develop other high-energy/power-density QSSLMBs.

关键词： Quasi-solid-state electrolyte Lignin PVDF Dendrite-free Li metal battery

The influence of amino acids on aztreonam spray-dried powders for inhalation

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Asian Journal of Pharmaceutical Sciences 2015年第6期10卷 541-548页

作者： xiao-fei yang Ying Xu Da-Sheng Qu Hao-Ying Li College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Testing and Analysis Centre Soochow UniversitySuzhou 215123China Suzhou Hui-Ren Biotech Co.Ltd Suzhou 215513China

The dry powder inhalation of antibiotics for the treatment of lung infections has attracted drastically increasing attention as it offers rapid local therapy at lower doses and minimal side *** this study,aztreonam(AZT)was used as the model antibiotic and spraydried to prepare powders for *** acids of glycine(GLY),histidine(HIS)and leucine(LEU)were used as excipients to modify the spray-dried *** was demonstrated that the GLY-AZT spray-dried powders formed huge agglomerates with the size of 144.51μm,which made it very difficult to be delivered to the lungs(FPF:0.29%w/w only).In comparison with the AZT spray-dried powders,HIS-modified spray-dried powders showed increased compressibility,indicating larger distance and less cohesion between particles;while the LEU-modified spray-dried particles showed a hollow structure with significantly decreased *** fine particle fraction for HIS-and LEU-modified powders was 51.4%w/w and 61.7%w/w,respectively,and both were significantly increased(one-way ANOVA,Duncan’s test,P<0.05)compared to that of AZT spray-dried powders(45.4%w/w),showing a great potential to be applied in clinic.

关键词： Aztreonam Spray-drying Inhalation Amino acids