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MnO Stabilized in Carbon-Veiled Multivariate Manganese Oxides as High-Performance Cathode Material for Aqueous Zn-Ion Batteries

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Energy & Environmental Materials 2021年第4期4卷 603-610页

作者： Wanwei Jiang Haiting Shi Xijun Xu Jiadong Shen Zhiwei Xu Renzong Hu State key laboratory of Separation Membranes and Membrane Processes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510640China

Aqueous Zn-ion battery has emerged as one of the most prospective energy storage devices due to its low cost,high safety,and ***,Zn-ion batteries are bottlenecked by significant capacity fading during long-term cycling and poor performance at high current ***,we report an available cooperation of multivariate manganese oxides@carbon hybrids(MnO_(2)/MnO@C and MnO_(2)/Mn_(3)O_(4)@C)via a plasma-assisted design as an attractive Zn-ion *** them,the MnO_(2)/MnO@C cathode exhibits a reversible specific capacity of 165 m Ah g^(-1)over 200 cycles at a high rate of 0.5 A g^(-1),and possesses great rate performance with high capacities of 110 and 100 m Ah g^(-1)at a high rate of 0.8 and 1 A g^(-1),*** good cathode performance significantly results from the facile charge transfer and ions(Zn^(2+)and H^(+))insertion in the manganese oxides/carbon hybrids featuring phase stability behavior in the available cooperation of multivalence and carbon conductive *** work will promote the Zn-manganese dioxide system for the design of low-cost and high-performance aqueous rechargeable Zn-ion batteries.

关键词： aqueous rechargeable Zn batteries conductive substrates multivariate manganese oxides phase stability plasma

Ultrafine Grain Tungsten Heavy Alloys with Excellent Performance Prepared by Spark Plasma Sintering

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 393-398页

作者： ZHANG Jingang WANG Weimin JI Wei HE Qianglong WANG Aiyang TAN Lin YANG Kai State key laboratory of Advanced Technology for Materials Synthesis and processing Institute of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China

Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma *** present study mainly discussed the effects of sintering temperature on the density,microstructure and mechanical properties of the *** relative density of 98.12% was obtained at 1 050 ℃,and the tungsten grain size is about 871 *** 1 000 ℃-1 200 ℃,the mechanical properties of the alloys tend to first rise and then goes *** SPS,the alloy exhibits improved hardness (84.3 HRA at 1 050 ℃) and bending strength (987.16 MPa at 1 100 ℃),due to the ultrafine-grained *** fracture mode after bending tests is mainly characterized as intergranular or intragranular fracture of W grains,interfacial debonding of W grains-binding phase and ductile tearing of binding *** EDS analysis reveals a certain proportion of solid solution between W and Ni-Fe binding *** good mechanical properties of the alloys can be attributed to grain refinement and solid solution strengthening.

关键词： tungsten heavy alloys ultrafine grain nano-crystalline powders solid solution strengthening spark plasma sintering

Deposition Behavior at Different Substrate Temperatures by Using Supersonic Laser Deposition

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Journal of Iron and Steel Research International 2013年第10期20卷 87-93页

作者： YUAN Lin-jiang LUO fang YAO Jian-hua key laboratory of Special Purpose Equipment and Advanced processing Technology of Ministry of Education Zhejiang University of Technology College of Zhijiang Zhejiang University of Technology

The supersonic laser deposition （SLD） is a new fabrication process which combines the supersonic powder stream found in cold spray with laser heating of the deposition zone. Because of the instantaneity of particles impact, the deformation behaviors and the adhesion behaviors of particles impacted on the substrate by SI.D cannot be well investigated through experiments. Therefore, a finite elemen! model was developed to solve the problems above. Meanwhile, the heat effect of the substrate heated by laser was discussed. The effective plastic strain and the effec- tive stress between the particle and substrate at different laser preheal temperatures were studied. The results show that laser depositing temperatures of 1 000 and 1 100 ℃ on substrate would be the optimized for the bonding of parti- cles and substrate. In addition, the simulation results conformed to experimental results.

关键词： supersonic laser deposition deformation behavior adhesion behavior finite element model

Chiral transfer-dictated self-assembly of chiral block copolymers

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Aggregate 2021年第5期2卷 132-150页

作者： Hao Li Bijin Xiong Jiangping Xu Jintao Zhu State key Lab of Materials processing and Die and Mould Technology Key Lab of Materials Chemistry for Energy Conversion and Storage(HUST)of Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)WuhanChina

Chiral structures not only exist in nature widely,they also emerge in artificial systems,attracting myriad attentions due to their excellent mechanical,optical,electrical,and magnetic ***-assembly of chiral block copolymers(BCPs*),where at least one block consists of chiral centers,represents a facile strategy to form helical/spiral/network structures with a controlled ***,morphological chirality of BCP*assemblies was closely associated with molecular and conformational chirality of the chiral ***,chiral assemblies arose from molecular chirality of BCPs*,transferring up in the assembly process and dictated the chirality at a higher hierarchical *** contrast,notwithstanding similar assemblies could be observed from achiral BCPs under certain conditions,both left-and right-handed ones were usually observed simultaneously without a ***,unique feature of BCPs*to access to controllable chiral assemblies affords an opportunity to prepare advanced functional ***,we dedicated a review on assembly of BCPs*into chiral assemblies in bulk/films,selective solvents,and confined *** chiral transfer process in these assembly scenarios were discussed and highlighted as a key contributor to morphological *** and representative applications of BCP*assemblies were also described,followed by present challenges and future prospects of BCP*self-assembly.

关键词： block copolymers chiral transfer chirality conﬁned assembly self-assembly

First-Principles Study on Hexagonal WO_3 for HCHO Gas Sensing Application

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 772-780页

作者： Bo-Lin Tang Guo-Hua Jiang Wen-Xing Chen Jun-Min Wan Department of Materials Engineering Zhejiang Sci-Tech University key laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT) Ministry of Education National Engineering laboratory for Textile Fiber Materials and processing Technology (Zhejiang)

The adsorption energy, electronic structure, density of states, and electron population for adsorption of HCHO on the hexagonal WO3 （h-WO3）（001） surfaces were investigated by density functional theory calculations. The adsorption energy of HCHO molecule on W and O sites of WO-terminated h-WO3 （001） surface was -0.309 and -0.432 eV compared with the value at -1.936 eV for HCHO molecule on O-terminated h-WO3 （001） surface. According to the calculated results, the adsorption of HCHO on h-WO3 （001） surface was spontaneous with physical adsorption on WO- terminated h-WO3 （001） surface and chemisorption on O-terminated h-WO3 （001） surface. The charge transfer from adsorbed HCHO molecule to WO3 （001） surface was confirmed by the Mulliken population analysis, which suggested the potential application of h-WO3 for HCHO gas detection.

关键词： Semiconductors Surfaces Crystal structure Electronic structure

Discovering Cathodic Biocompatibility for Aqueous Zn–MnO_(2) Battery:An Integrating Biomass Carbon Strategy

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Nano-Micro Letters 2024年第6期16卷 111-126页

作者： Wei Lv Zilei Shen Xudong Li Jingwen Meng Weijie Yang Fang Ding Xing Ju Feng Ye Yiming Li Xuefeng Lyu Miaomiao Wang Yonglan Tian Chao Xu Institute of Energy Power Innovation North China Electric Power UniversityBeijing 102206People’s Republic of China Department of Power Engineering School of EnergyPower and Mechanical EngineeringNorth China Electric Power UniversityBaoding 071003People’s Republic of China key laboratory of RNA Biology Institute of BiophysicsChinese Academy of SciencesBeijing 100101People’s Republic of China Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi‑Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010People’s Republic of China

Developing high-performance aqueous Zn-ion batteries from sustainable biomass becomes increasingly vital for large-scale energy storage in the foreseeable ***,γ-MnO_(2) uniformly loaded on N-doped carbon derived from grapefruit peel is successfully fabricated in this work,and particularly the composite cathode with carbon carrier quality percentage of 20 wt%delivers the specific capacity of 391.2 mAh g^(−1)at 0.1 A g^(−1),outstanding cyclic stability of 92.17%after 3000 cycles at 5 A g^(−1),and remarkable energy density of 553.12 Wh kg^(−1) together with superior coulombic efficiency of~100%.Additionally,the cathodic biosafety is further explored specifically through in vitro cell toxicity experiments,which verifies its tremendous potential in the application of clinical ***,Zinc ion energy storage mechanism of the cathode is mainly discussed from the aspects of Jahn–Teller effect and Mn domains distribution combined with theoretical analysis and experimental ***,a novel perspective of the conversion from biomass waste to biocompatible Mn-based cathode is successfully developed.

关键词： Aqueous Zn-ion batteries Biocompatibility Jahn-Teller effect Mn domains γ-MnO_(2)

Effect of ultrasonic melt treatment on degassing of Mg-6Zn-1Ca alloy

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China Foundry 2015年第1期12卷 15-19页

作者： Zheng Jia Wen-ming Zhang Fu Yang Zhi-qiang Zhang Qi-chi Le Jian-zhong Cui College of Mechanical Engineering Shenyang University key laboratory of Electromagnetic processing of Materials Ministry of EducationNortheastern University

The effect of ultrasonic power and treatment time on degassing of Mg-6Zn-1Ca alloy was studied in this paper. The degassing effect was characterized by measuring densities of ingots. The results show that proper ultrasonic treatment can remove hydrogen from the melt of the Mg-6Zn-1Ca alloy. The ultrasonic degassing effect is closely related to the ultrasonic power density and treatment time. The degassing efficiency increases with an increase in ultrasonic power density when the melt is treated at 690 °C for 120 s, reaching its highest value at 1.2 W·cm-3. When the power density is 1.2 W·cm-3, with an increase in ultrasonic treatment time, the degassing efficiency increases at first, reaches its peak value at 120 s, then decreases as the ultrasonic treatment is further prolonged. In this experiment, the optimum degassing effect with an efficiency of 67.5 % is obtained by ultrasonic treatment with the power density of 1.2 W·cm-3 for 120 s. The maximum density of ingot can be increased from 1.8069 g·cm-3 to 1.8146 g·cm-3(increased by 0.43%).

关键词： ultrasonic treatment degassing efficiency Mg-6Zn-1Ca alloy cavitation

New materials and designs for 2D-based infrared photodetectors

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Nano Research 2023年第2期16卷 3074-3103页

作者： Huitian Guo Weihong Qi State key laboratory of Solidification processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Shandong laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264006China

Infrared photodetectors have attracted much attention considering their wide civil and military ***-dimensional(2D)materials offer new opportunities for the development of costless,high-level integration and high-performance infrared *** the advent of a broad investigation of infrared photodetectors based on graphene and transition metal chalcogenides(TMDs)exhibiting unique properties in recent decades,research on the better performance of 2D-based infrared photodetectors has been extended to a larger scale,including explorations of new materials and artificial structure *** this review,after a brief background introduction,some major working mechanisms,including the photovoltaic effect,photoconductive effect,photogating effect,photothermoelectric effect and bolometric effect,are briefly ***,the discussion mainly focuses on the recent progress of three categories of 2D materials beyond graphene and *** transition metal dichalcogenides,black phosphorus and arsenic black phosphorous and 2D ternary compounds are great examples of explorations of mid-wavelength or even long-wavelength 2D infrared ***,four types of rational structure designs,including type-II band alignments,photogating-enhanced designs,surface plasmon designs and ferroelectric-enhanced designs,are discussed to further enhance the performance via diverse mechanisms,which involve the narrower-bandgap-induced interlayer exciton transition,gate modulation by trapped carriers,surface plasmon polaritons and ferroelectric polarization in ***,applications including imaging,flexible devices and on-chip integration for 2D-based infrared photodetectors are ***,a summary of the state-of-the-art research status and personal discussion on the challenges are delivered.

关键词： two-dimensional(2D)materials infrared photodetectors noble transition metal dichalcogenides black phosphorus layered ternary compounds structure designs

Effects of Rare Earth Pr/Ce on Tribological Behavior of ADC12 Alloy

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Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 136-142页

作者： XU Lixiao YAN Hong LIU Wei XIONG Junjie School of Mechanical and Electrical Engineering Nanchang UniversityNanchang 330031China key laboratory of Light Alloy Preparation and processing Nanchang 330031China

The microstructure and microhardness of ADC12 alloy that was mixed with 0,0.3,0.6,and 0.9 wt.% rare earth praseodymium/cerium (Pr/Ce) were *** addition of Pr/Ce improved the microhardness of the *** ADC12+0.6 wt% Pr/Ce alloy displayed the smallest grain size and maximal *** tribological behavior of the alloys was tested by the pin-on-disc dry sliding friction pair with a sliding velocity of 0.21 m/s under various loads (20,40,60,80 N).The wear morphology was observed by a scanning electron microscope (SEM) and the wear mechanism was *** result indicated that the wear resistance of ADC12+0.6 wt% Pr/Ce alloy was the most *** wear rate relative to the matrix is reduced by 67.5% under a load of 20 *** wear mechanism is adhesive wear.

关键词： Pr/Ce ADC12 microstructure microhardness wear mechanism