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Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng Zheng Wang Zhou Ying Mo Biao Zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei Liu co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy co. LTD.

Hard carbon （HC） has been co.sidered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectrosco.y/electrochemical impedance spectrosco.y （FTIR/EIS） and X-ray photoelectron spectrosco.y （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping co.tent exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectrosco.y

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Effects of ultrasonic-assisted extraction on bioactive co.pounds,volatile flavors and antioxidant activities of vine tea water extracts

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Traditional Medicine Research 2025年第1期10卷 73-81页

作者： Xiao-Long Zhou Wei-Jin Jiang Ji Yu Mao-Jun Yao Yun-Tong Li hunan provincial Key Laboratory of Research Resource Mining and High-valued Utilization on Edible&Medicinal PlantCollege of Chemistry and Chemical EngineeringJishou UniversityJishou 416000China hunan Gaoge Dairy co. Ltd.Changsha 410000China

Background:Ampelopsis grossedentata,vine tea,which is the tea alternative beverages in *** vine tea processing,a large amount of broken tea is produced,which has low co.mercial ***:This study investigates the influence of different extraction methods(room temperature water extraction,boiling water extraction,ultrasonic-assisted room temperature water extraction,and ultrasonic-assisted boiling water extraction,referred to as room temperature water extraction(RE),boiling water extraction(BE),ultrasonic assistance at room temperature water extraction(URE),and ultrasonic assistance in boiling water extraction(UBE))on the yield,dihydromyricetin(DMY)co.tent,free amino acid co.position,volatile aroma co.ponents,and antioxidant properties of vine tea ***:A notable influence of extraction temperature on the yield of vine tea extracts(Pco.tent of the extracts(Pco.tent in the RE extracts was 59.94±1.70%,that of URE reached 66.14±2.78%.Analysis revealed 17 amino acids,with L-serine and aspartic acid being the most abundant in the extracts,nevertheless ultrasound-assisted extraction reduced total free amino acid *** chromatography-mass spectrometry analysis demonstrated an increase in the diversity and quantity of co.pounds in the vine tea water extracts obtained through ultrasonic-assisted ***,69 and 68 volatile co.pounds were found in URE and UBE extracts,which were higher than the number found in RE and BE *** vitro,antioxidant activity assessments revealed varying antioxidant capacities among different extraction methods,with RE exhibiting the highest DPPH scavenging rate,URE leading in ABTS•+free radical scavenging,and BE demonstrating superior ferric ion reducing antioxidant ***:The findings suggest that extraction methods signi

关键词： vine tea dihydromyricetin ultrasonic-assisted extraction volatile aroma co.ponents

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Pixel-level crack segmentation of tunnel lining segments based on an enco.er–deco.er network

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Frontiers of Structural and Civil Engineering 2024年第5期18卷 681-698页

作者： Shaokang HOU Zhigang OU Yuequn HUANG Yaoru LIU State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China China Renewable Energy Engineering Institute Beijing 100120China State Key Laboratory of Stimulation and Regulation of water Cycles in River Basins China Institute of Water Resources and Hydropower ResearchBeijing 100038China hunan provincial water resources development&investment co. Ltd.Changsha 410007China

Regular detection and repair for lining cracks are necessary to guarantee the safety and stability of *** development of co.puter vision has greatly promoted structural health *** study proposes a novel enco.er–deco.er structure,CrackRecNet,for semantic segmentation of lining segment cracks by integrating improved VGG-19 into the U-Net *** image acquisition equipment is designed based on a camera,3-dimensional printing(3DP)bracket and two laser rangefinders.A tunnel co.crete structure crack(TCSC)image data set,co.taining images co.lected from a double-shield tunnel boring machines(TBM)tunnel in China,was *** data preprocessing operations,such as brightness adjustment,pixel resolution adjustment,flipping,splitting and annotation,2880 image samples with pixel resolution of 448×448 were *** model was implemented by Pytorch in PyCharm processed with 4 NVIDIA TITAN V *** the experiments,the proposed CrackRecNet showed better prediction performance than U-Net,TernausNet,and *** paper also discusses GPU parallel acceleration effect and the crack maximum width quantification.

关键词： tunnel lining segment crack detection semantic segmentation co.volutional neural network enco.er-deco.er structure

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Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng Zhang Chenyang Zhang Linlin Wu Wei Sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China hunan provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectrosco.y(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen co.tent in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions co.ld effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and co.ld promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

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Disco.ery of a new family member of arsenic–vanadium polyoxometalates with high catalytic performance for one-pot co.pling of co., epoxides and amines

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Tungsten 2025年第1期7卷 80-87页

作者： Fang-Qian Wang Yin Zhang Wei-Wei Wang Mei-Qian Fu Hong-Bing Mo Wei-Dong Yu Chao Liu Jun Yan co.lege of Chemistry and Chemical Engineering Central South University Junior Education Department Changsha Normal University School of Science Hunan University of Technology and Business

Arsenic-vanadium polyoxometalates（POMs） represent a family of tremendous potential catalysts owing to their peculiar physical and chemical *** in co.co.version,using POMs to catalyze the co.version of co.and epoxide into chemical intermediates is the research ***,A new family number of arsenic-vanadium POMs,[N（CH3）4]4[As8V12O38（H2O）]·2H2O({As8V12O38}),was reported and characterized by single-crystal X-ray diffraction,fourier transform infrared spectrosco.y,X-ray photoelectron spectrosco.y,*** from other allotropicity,{As8V12O38}shows a different structure pattern with an I-43d *** obtained {As8V12O38} was employed as a catalyst for the *** initial catalytic reaction co.firmed that {As8V12O38} can catalyze the formation of epoxy carbonate by using 1.01 kPa co.and epoxide at 70℃.Furtherly,when added amine in the catalytic system,oxazolidinone co.ld be obtained by high yields,which provides an efficient way to co.vert co.into profitable ***,a possible catalytic reaction mechanism was proposed by using different characterization analyses.{As8V12O38} first catalyzes the epoxide and co.to form an epoxy carbonate and then catalyzes epoxy carbonate and benzylamine into oxazolidinone.

关键词： Arsenic co. co.version Oxazolidinone Polyoxometalates Vanadium

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Deformation co.trol criterion of shield tunnel under lateral relaxation of soft soil

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Frontiers of Structural and Civil Engineering 2023年第5期17卷 780-795页

作者： Shimin WANG Xiaoyu PENG Hang ZHOU Xuhu HE Anqi ZHOU Bing CHEN Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610036China Guangdong provincial Railway co.struction investment Group co. LtdGuangzhou 510080China

Metro shield tunnels under the lateral relaxation of soil(LRS)are susceptible to significant lateral deformations,which jeopardizes the structural safety and ***,deformation co.trol standards for such situations have not been clearly ***,based on a specific case,a model test is co.ducted to realize the LRS of a shield tunnel in a sandy stratum to reveal its effect on segment ***,a deformation co.trol criterion is *** LRS is simulated by linearly reducing the loads applied to the lateral sides of the segment *** lateral unloading,the lateral earth pressure co.fficient on the segment decreases almost exponentially,and the structural deformation is characterized by horizontal expansion at the arch haunches and vertical shrinkage at the arch vault and arch *** on the mechanical pattern of the segment structure and the aco.stic emission,the deformation response of a segment can be classified into three stages:elastic and quasi-elastic,damage,and rapid deformation *** a shield tunnel with a diameter of approximately 6 m and under the lateral relaxation of sandy soil,when the ellipticity of the segment is less than 2.71%,reinforcement measures are not ***,the segment deformation must be co.trolled when the ellipticity is 2.71%to 3.12%;in this regard,an ellipticity of 3%can be used as a benchmark in similar engineering projects.

关键词： shield tunnel lateral relaxation of soil deformation co.trol criterion of segment structure model test

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Single-phase P2-type layered oxide with Cu-substitution for sodium ion batteries

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Journal of Energy Chemistry 2020年第4期29卷 148-154页

作者： Tao Chen Weifang Liu Yi Zhuo Hang Hu Maolan Zhu Ruizheng Cai Xinxin Chen Jun Yan Kaiyu Liu hunan provincial Key Laboratory of Chemical Power Sources Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese ResourcesCollege of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina School of Chemistry and Materials Longyan UniversityLongyan 364012FujianChina

The development of high-performance layered oxide cathodes for sodium ion batteries (SIBs) co.tinues to facing be hindered by severe challenges to ***,a single-phase P2-Na0.67Mn0.6Ni0.2co..1Cu0.1O2(NMNCC) co.prising multiple-layer-oriented stacked nanoflakes is designed and synthesized via a simple sol-gel *** large lattice parameters ensure a large three-dimensional frame,which enables the diffusion of sodium *** to its optimal morphology structure modulation transition metal substitution strategy,the MNCC electrode delivers a reversible capacity of 131.3 mAh g^-1 at 0.1 C with retention of 86.7%after 200 *** addition,it provides an initial capacity of 86.7 mAh g^-1,and a retention of 80.0%after 500 cycles even at a current density of up to 1 A g^-*** stable single-phase structure and slight volume shrinkage observed after Na+extraction further delay structural *** Na+mobility and low Na+diffusion resistance are also guarantee the excellent rate performance of the NMNCC ***,we determine that the NMNCC cathode is significant in the advancement of promising novel layered oxide cathodes.

关键词： Layered oxides Sodium-ion batteries Rate capability P2 structure

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An improved CFD model of gas flow and particle interception in a fiber material

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Chinese Journal of Chemical Engineering 2017年第3期25卷 264-273页

作者： Zhiwei Sun Jianhui Wen Xiao Luo Wen Du Zhiwu Liang Kaiyun Fu Technology Center of China Tobacco.hunan Industrial co. Ltd. Joint International Center for co. Capture and Storage (iCCS) Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 EmissionsCollege of Chemistry and Chemical EngineeringHunan University

An improved CFD model of gas flow and particle interception in a fiber material which fiber size is Y-shape was developed in this work. The porous medium model was used to build the model of the whole size of fiber filter medium. Mixture model was adopted. The algorithm of particle interception in the whole size of fiber filter medium was derived and UDF(User Defined Function) that described kinds of particle filtering mechanisms in filter fibrous media was added to the Fluent default co.servation equation as source term for simulation. The inertial resistance of the filter was taken into co.sideration, which provided a more precise measurement of the smoke flow and the particle interception in the filter under higher smoke speed co.ditions. The co.mercial software, Fluent 6.3, was used to simulate the smoke flow and particle interception in the filter in a single suction. The velocity and pressure profiles of smoke or nico.ine particle in the filter, as well as nico.ine particle volume fraction profile were well simulated. Finally, the co.parisons of nico.ine particle filtration efficiency between Fluent simulation results in this work and experimental results, as well as the model prediction in the literature were made to validate the simulation model. The co.parisons showed that the particle entrapment model from simulation results was in good agreement with that from the experimental results. In addition, the Fluent simulation results are closer to reality both at the beginning and the end of the smoke process co.paring with the model predicted results in the literature.

关键词： Numerical simulation Y-shape fiber Particle interception Flow field distribution Filtration efficiency UDF

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Effects of heat treatment on mechanical properties of an extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr alloy and establishment of its Hall–Petch relation

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Journal of Magnesium and Alloys 2022年第2期10卷 539-551页

作者： Lei Liu Xiaojie Zhou Shilun Yu Jian Zhang Xianzheng Lu Xin Shu Zaijun Su hunan provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China hunan Xiangtou Goldsky Titanium Metal co. Ltd.Changsha 410205China hunan Aerospace Tianlu Advanced Material Testing co. LtdChangsha 410600China School of Mechanical Engineering Hunan University of TechnologyZhuzhou 412007China

The effects of T4,T5,and T6 treatment on the microstructure and mechanical properties of the extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr(wt.%)alloy with a relatively low RE co.tent(7.5 wt.%)were investigated.T4 treatment at 450–500°C induces a gradual grain growth ofα-Mg but an obvious transition of texture co.ponent from⊥ED to∥*** LPSO phases are highly stable against annealing while intragranular ones experience dissolution and *** peak-ageing at 200°C,the elongation of as-extruded and T4 samples is just slightly reduced or even increased due to the weak ageing hardening response.T5 sample exhibits an attractive co.bination of strength and ductility,with a tensile yield strength(TYS)of 303 MPa and elongation of 20.0%.The Hall–Petch relation for the alloys with or without ageing treatment has been *** boundary strengthening rather than precipitation strengthening has the dominant co.tribution to TYS,and a modified equation is developed to predict grain boundary strengthening values for Mg-Gd-Y-Zn-Zr alloys which co.tain different Schmid factors for basal slip.

关键词： Magnesium alloys Heat treatment Hall–Petch Mechanical properties Strengthening mechanism

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Preparation and phase change performance of Na_2HPO_4·12H_2O@poly(lactic acid) capsules for thermal energy storage

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Chinese Journal of Chemical Engineering 2019年第3期27卷 695-700页

作者： Na Fan Lang Chen Guoyong Xie Donghong Yin Chak-Tong Au Shuangfeng Yin State Key Laboratory of Chemo/Biosensing and Chemometrics Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions College of Chemistry and Chemical Engineering Hunan University hunan Tobacco.Industry co. Ltd. co.lege of Chemistry and Chemical Engineering Hunan Institute of Engineering

Micro-encapsulated phase-change materials(micro PCMs) with Na_2 HPO_4·12 H_2 O encapsulated in poly(lactic acid)(PLA) shell were prepared by a solvent evaporation–precipitation method that involves the use of a co.xial needle. The effects of PLA co.centration, stirring speed, injection rate of co.e and shell solutions, and polyvinyl alco.ol(PVA) co.centration on phase change properties were investigated. The thermal properties of microP CMs were characterized by differential scanning calorimetry(DSC). The capsules prepared under the optimal co.ditions are about 2 mm in diameter and show a latent heat of up to 122.2 J·g^(-1).

关键词： Micro-encapsulated Phase-change materials Na2HPO4·12H2O co.xial needle Poly(lactic acid) Thermal energy storage capsule

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