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Dual modulation of homogeneous nanomaterialization and electrochemical activation enhancing zinc ion storage

Science China Chemistry 2025年第1期68卷 385-393页

作者： Jianwei wang Huan wang Kangning wang wenhui wang Wenlin Zhang Yanzhong Zhen School of Chemistry & Chemical Engineering Yan'an University

Vanadium-based electrode materials are widely investigated,but the low specific capacity and slow electrochemical kinetics in aqueous zinc-ion batteries still limit their commercial ***,the VS2/Ca V4O9material with the morphology of nanoflower was synthesized by a one-step hydrothermal *** to the blocky structure of pure VS2material,the VS2/Ca V4O9material is composed of thinner homogeneous *** open structures could provide abundant electrochemical active sites and ion transport channels,and then promote the electrochemical reaction *** addition,they can also buffer the bulk strain during the reaction *** improve the utilization of vanadium elements,an in-situ electrochemical activation strategy is used to explore the storage performance of the VS2/Ca V4O9material,the different activation voltage range of 0.4–1.6 and 0.4–1.4 V are selected,*** with the longer activation plateau of activated-VS2,the VS2/Ca V4O9cathode could quickly reach the activation state in the range of 1.4–1.6 V and cause the release of additional Zn storage sites *** VS2/Ca V4O9cathode delivers a higher power density of 37,000 W kg-1and a significant energy density of 423 Wh *** the high current density of 15 A g-1,the VS2/Ca V4O9cathode still has a discharge capacity of 183.9m Ah g-1after 5,000 cycles,and the capacity decay rate per cycle is only 0.0042%.Continuous cyclic voltammetry （CV） curves,electrochemical impedance spectroscopy （EIS） measurements,density functional theory （DFT） calculation and galvanostatic intermittent titration technique （GITT） measurements demonstrate that the VS2/Ca V4O9cathode has a faster ion diffusion/charge transfer ***,the assembled flexible device has an excellent mechanical stability.

关键词： dual modulation homogeneous nanomaterialization electrochemical activation zinc ion storage

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Position-sensitive detectors based on two-dimensional materials

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Nano Research 2021年第6期14卷 1889-1900页

作者： wenhui wang Junpeng Lu Zhenhua Ni School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing211189China

Two-dimensional(2D)materials have attracted great attention in optoelectronics because of their unique structure,optical and electrical *** high-performance photodetectors and implementing their applications are eager to promote the development of 2D ***-sensitive detector(PSD)is an optical inspection device for the precise measurements of position,distance,angle,and other relevant physical *** is a widely used component in the fields of tracking,aerospace,nanorobotics,and so ***,PSD is also a photodetector based on the lateral photovoltaic effect(LPE).This article reviews recent progress in high-performance PSD based on 2D *** high-sensitive photodetectors and LPE involved in 2D photodetectors are firstly ***,we introduce the research progress of PSD based on 2D materials and analyze the carrier dynamics in different device ***,we summarize the functionalities and applications of PSD based on 2D materials,and highlight the challenges and opportunities in this research area.

关键词： two-dimensional(2D)materials graphene photodetector lateral photovoltaic effect position-sensitive detector heterojunction

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Stabilizing sodium metal anode through facile construction of organicmetal interface

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Journal of Energy Chemistry 2022年第3期31卷 133-139,I0005页

作者： Jiaolong Zhang Shuo wang wenhui wang Baohua Li School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School(SIGS)Shenzhen 518055GuangdongChina

Implementation of sodium metal anode is highly desired for sodium batteries due to its high theoretical capacity and low redox ***,formation of unstable solid electrolyte interphase(SEI)and uncontrollable growth of dendrites during charge/discharge cycles greatly hinder the practical application of sodium metal *** this study,an organic-metal artificial layer made of PVdF and Bi was constructed to protect Cu current collector via a facile coating method,leading to smooth and dense sodium plating/stripping,which in retern enables stable cycling and high coulombic efficiency(CE).At 1 mA cm^(−2),PB@Cu current collector presents extended lifetime of~2500 h with high sodium utilization of 50%,which is approximately six times higher than Cu current ***@Cu electrode also displays high average CE of 99.92%and 99.95%over 2500 and 1300 cycles at 1 and 2 mA cm^(−2) respectively,which is in sharp contrast to the low and tremendously fluctuant CE gained from bare Cu ***,stable capacity of>90 mAh g^(−1) over 150 cycles is realized for PB@Cu-based full cell assembled with NVP cathode at a low negative-positive capacity ratio of~3.5,which is significantly higher than 37.2 mAh g^(−1) obtained from NVP/Cu at 150th *** superior electrochemical performance of PB@Cu current collector is revealed to originate from the alloyed Na_(3)Bi phase with high sodium conductivity and robust mechanical strength as well as the formation of NaF-rich SEI with fast sodium ion migration,which enable dendrite-free morphology during plating/stripping cycles.

关键词： Sodium metal anode Organic-metal artificial layer Bi PVdF Solid electrolyte interphase

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The Late Tremadocian(Ordovician)Graptolite Kiaerograptus from Central Hunan,China:Taxonomy and Biostratigraphy

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 1-12页

作者： LI Ming LI Lixia wang wenhui Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Nanjing Institute of Geology and Palaeontology Chinese Academy of ScienceNanjing 210008China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China

Well-preserved graptolites of the genus Kiaerograptus are first reported from the upper Tremadocian Yinchupu Formation in the Nanba section,Yiyang,Hunan Province,South China,including four species,i.e.,Kiaerograptus lauzonensis(Erdtmann,1966),Kiaerograptus stoermeri(Erdtmann,1965),Kiaerograptus ***?Lindholm,1991,and Kiaerograptus sp.,which are robust in *** on these new specimens,the Kiaerograptus biozone is established for the first time in South China,increasing the late Tremadoc graptolite biozones in South China from four to five,in ascending order as follows:the Adelograptus tenellus biozone,the Aorograptus victoriae biozone,the Kiaerograptus biozone,the Sagenograptus murrayi biozone,and the Hunnegraptus copiosus biozone.A review of the occurrence records for robust Kiaerograptus species worldwide reveals that the distribution is restricted to the Aorograptus victoriae biozone and Kiaerograptus biozone in the late *** limited stratigraphical distribution makes Kiaerograptus a valuable taxon for precise biostratigraphical correlation at both the regional and global scales.

关键词： paleontology biostratigraphy graptolites anisograptid Tremadocian Hunan Province

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Examining heterogeneity of stromal cells in tumor microenvironment based on pan-cancer single-cell RNA sequencing data

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Cancer Biology & Medicine 2022年第1期19卷 30-42页

作者： wenhui wang Li wang Junjun She Jun Zhu Department of Genetics and Genomic Sciences Icahn School of Medicine at Mount SinaiNew YorkNY 10029USA Sema4 a Mount Sinai ventureStamfordCT 06902USA First Affiliate Hospital of Xi’an Jiaotong University Xi’an 710061China Tisch Cancer Institute Icahn School of Medicine at Mount SinaiNew YorkNY 10029USA

Tumor tissues contain both tumor and non-tumor cells,which include infiltrated immune cells and stromal cells,collectively called the tumor microenvironment(TME).Single-cell RNA sequencing(sc RNAseq)enables the examination of heterogeneity of tumor cells and *** this review,we examined sc RNAseq datasets for multiple cancer types and evaluated the heterogeneity of major cell type composition in different cancer *** further showed that endothelial cells and fibroblasts/myofibroblasts in different cancer types can be classified into common subtypes,and the subtype composition is clearly associated with cancer characteristic and therapy response.

关键词： Stromal cells tumor microenvironment pan-cancer single-cell RNA sequencing data

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How defects influence the photoluminescence of TMDCs

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Nano Research 2021年第1期14卷 29-39页

作者： Mengfan Zhou wenhui wang Junpeng Lu Zhenhua Ni School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 211189China

Two-dimensional(2D)transition metal dichalcogenide(TMDC)monolayers,a class of ultrathin materials with a direct bandgap and high exciton binding energies,provide an ideal platform to study the photoluminescence(PL)of light-emitting *** thin TMDCs usually contain various defects,which enrich the lattice structure and give rise to many intriguing *** the influences of defects can be either detrimental or beneficial,a comprehensive understanding of the internal mechanisms underlying defect behaviour is required for PL ***,recent advances in the defect influences on PL emission are summarized and *** mechanisms are the focus of this review,such as radiative/nonradiative recombination kinetics and band structure *** challenges and opportunities are present in the field of defect manipulation,and the exploration of mechanisms is expected tofacilitate the applications of 2D TMDCs in the future.

关键词： two-dimensional material transition metal dichalcogenides(TMDCs) photoluminescence(PL) defect defect engineering quantum yield(QY)

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Removal of gaseous volatile organic compounds via vacuum ultraviolet photodegradation: Review and prospect

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Journal of Environmental Sciences 2023年第3期125卷 427-442页

作者： Xue Sun Chaolin Li Boping Yu Jingwen wang wenhui wang School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Shenzhen Academy of Environmental Sciences Shenzhen 518001China

Volatile organic compounds(VOCs) have attracted much attention for decades as they are the precursors of photochemical smog and are harmful to the environment and human health. Vacuum ultraviolet(VUV) photodegradation is a simple and effective method to decompose VOCs (ranging from tens to hundreds of ppmV) without additional oxidants or catalysts in the air at atmospheric pressure. In this paper, we review the research progress of VOCs removal via VUV photodegradation. The fundamentals are outlined and the key operation factors for VOCs degradation, such as humidity, oxygen content, VOCs initial concentration, light intensity, and flow rate, are discussed. VUV photodegradation of VOCs mixture is elucidated. The application of VUV photodegradation in combination with ozoneassisted catalytic oxidation(OZCO) and photocatalytic oxidation(PCO) systems, and as the pre-treatment technique for biological purification are illustrated. Based on the summary,we propose the challenges of VUV photodegradation and perspectives for its future development.

关键词： Vacuum ultraviolet(VUV) photodegradation Gaseous volatile organic compounds(VOCs) O_(3)elimination

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Pushover analysis of underground structures:Method and application

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Science China(Technological Sciences) 2014年第2期57卷 423-437页

作者： LIU JingBo wang wenhui DASGUPTA Gautam Institute Department of Civil Engineering Tsinghua University Department of Civil Engineering and Engineering Mechanics Columbia UniversityNew York NY 10027 USA

Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic *** that traditional pushover analysis is restricted in underground structures due to the stark differences in the seismic response characteristics of surface structures,this paper proposes a pushover analysis method for underground structures and its application in seismic damage ***,three types of force distribution are presented based on ground response ***,the target displacements and analysis models are established according to force-based and performance-based ***,the pushover analysis procedure for underground structures is ***,the applicability of pushover analysis to underground structures is verified by comparing the responses of a Chongwenmen subway station determined by the proposed procedure and by nonlinear response history *** addition,two other points are made:that the inverted triangular distribution of effective earthquake acceleration is more practical than the other two distributions,and that performance-based design is more effective than force-based ***,a cyclic reversal loading pattern based on one cycle of reversal loads as an earthquake event is presented and applied to the seismic damage assessment of underground *** results show that the proposed pushover analysis can be effectively applied to the seismic design and damage assessment of underground structures.

关键词： underground structure pushover analysis seismic demand seismic damage assessment

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Modified Pressure Loss Model for T-junctions of Engine Exhaust Manifold

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1232-1239页

作者： wang wenhui LU Xiaolu CUI Yi DENG Kangyao Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiaotong University

The T-junction model of engine exhaust manifolds significantly influences the simulation precision of the pressure wave and mass flow rate in the intake and exhaust manifolds of diesel engines. Current studies have focused on constant pressure models, constant static pressure models and pressure loss models. However, low model precision is a common disadvantage when simulating engine exhaust manifolds, particularly for turbocharged systems. To study the performance of junction flow, a cold wind tunnel experiment with high velocities at the junction of a diesel exhaust manifold is performed, and the variation in the pressure loss in the T-junction under different flow conditions is obtained. Despite the trend of the calculated total pressure loss coefficient, which is obtained by using the original pressure loss model and is the same as that obtained from the experimental results, large differences exist between the calculated and experimental values. Furthermore, the deviation becomes larger as the flow velocity increases. By improving the Vazsonyi formula considering the flow velocity and introducing the distribution function, a modified pressure loss model is established, which is suitable for a higher velocity range. Then, the new model is adopted to solve one-dimensional, unsteady flow in a D6114 turbocharged diesel engine. The calculated values are compared with the measured data, and the result shows that the simulation accuracy of the pressure wave before the turbine is improved by 4.3% with the modified pressure loss model because gas compressibility is considered when the flow velocities are high. The research results provide valuable information for further junction flow research, particularly the correction of the boundary condition in one-dimensional simulation models.

关键词： T-junction diesel engine pressure loss model total pressure loss coefficient

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Photonic topological fermi nodal disk in non-Hermitian magnetic plasma

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Light(Science & Applications) 2020年第1期9卷 1631-1638页

作者： wenhui wang Wenlong Gao Leifeng Cao Yuanjiang Xiang Shuang Zhang International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Institute of Microscale Optoelectronics(IMO)Shenzhen University518060 ShenzhenChina School of Physics&Astronomy University of BirminghamBirmingham B152TTUK National Key Laboratory for Laser Fusion Research Centre of Laser FusionCAEP621900 MianyangChina School of Physics and Electronics Hunan University410082 ChangshaChina

Topological physics mainly arises as a necessary link between properties of the bulk and the appearance of surface states,and has led to successful discoveries of novel topological surface states in Chern insulators,topological insulators,and topological Fermi arcs in Weyl,Dirac,and Nodal line semimetals owing to their nontrivial bulk *** particular,topological phases in non-Hermitian systems have attracted growing interests in recent *** this work,we predict the emergence of the topologically stable nodal disks where the real part of the eigen frequency is degenerate between two bands in non-ideal magnetohydrodynamics plasma with collision and viscosity *** nodal disk possesses continuously distributed topological surface charge density that integrates to *** is found that the lossy Fermi arcs at the interface connect to the middle of the projection of the nodal *** further show that the emergence,coalescence,and annihilation of the nodal disks can be controlled by plasma parameters and dissipation *** findings contribute to understanding of the linear theory of bulk and surface wave dispersions of non-ideal warm magnetic plasmas from the perspective of topological physics.

关键词： topological nodal Fermi

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