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Layered metal carbo–selenide Nb_(2)CSe_(2) with van der Waals interlayer coupling

Journal of Advanced Ceramics 2025年第1期14卷 101-110页

作者： Junchao Wang Renfei Cheng Tao Hu Xinyue Tang Yan Liang Min Tian Ting Xiong Qiuhong Lu Qi Zhu Zhiqing Yang Xiaohui Wang Yanchun Zhou Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Materials Science and Devices School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Ji Hua Laboratory Foshan 528000China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The stacking structure of Nb_(2)CSe_(2),a newly synthesized layered metal carbo-selenide,was elucidated by scanning transmission electron ***,CSe2 features Se-Nb-C-Nb-Se quintuple atomic *** layers are stacked in Bernal *** this mode,Nb,CSe2 crystallizes in a trigonal symmetry(space group P3m1,No.164),with lattice parameters of a=3.33 A and c=18.20 *** structure calculations indicate that the metal carbo-selenide has Fermi energy crossing the bands where it touches to give a zero gap,indicating that it is an electronic *** evidenced experimentally,the electrical conductivity is as high as 6.6×10^(5) S·m^(-1),outperforming the counterparts in the MXene *** to the layered structure,the bonding in Nb_(2)CSe_(2) with an ionic formula of(Nb^(1.48+)),(C^(1.74-))(Se^(0.61-))_(2) is highly anisotropic,with metallic-covalent-ionic bonding in intralayers and weak bonding between *** layered nature is further evidenced by elastic properties,interlayer energy,and friction coefficient *** characteristics indicate that Nb_(2)CSe_(2) is an analog of molybdenum disulfide(MoS_(2)),which is a typical binary van der Waals(vdW)***,vibrational properties are reported,which may offer an optical identification standardfor new ternary vdW solids in spectroscopic studies,including Raman scatteringand infrared absorption.

关键词： MXene Nb_(2)CSe_(2) crystal structure electronic structure elastic properties interlayer coupling Raman spectroscopy friction coefficient

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In-Situ Pt-Decorated, Direct Growth of Mixed Phase 2H/1T–MoSe2 on Carbon Paper for Enhanced Hydrogen Evolution Reaction

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Energy & Environmental materials 2025年第2期8卷 187-195页

作者： Jong-Hwan Park Sun-Woo Kim So Young Lee Yuri Jung Jae-Chul Ro Seong-Ju Park Hyoung-Juhn Kim Dong Han Seo Su-Jeong Suh School of Advanced Materials Science and Engineering Sungkyunkwan University Daegu Mechatronics & Materials Institute Energy Materials & Devices Department of Energy Engineering Korea Institute of Energy Technology KENTECH

Metal dichalcogenide-based 2D materials,gained considerable attention recently as a hydrogen evolution reaction（HER） *** this work,we synthesized MoSe2-based electrocatalyst via hydrothermal route with varying phase contents（1T/2H） and respective HER performances were evaluated under the acidic media（0.5 M H2SO4）,where best HER performance was obtained from the sample consisting of mixed 1T/2H phases,which was directly grown on a carbon paper(167 mV at10 mA cm-2) Furthermore,HER performance of electrocatalyst was further improved by in-situ electrodeposition of Pt nanoparticles（0.15 wt%） on the MoSe2 surface,which lead to significant enhancement in the HER performances(133 mV at 10 mA cm-2).Finally,we conducted density functional theory calculations to reveal the origin of such enhanced performances when the mixed 1T/2H phases were present,where phase boundary region（1T/2H heterojunction） act as a low energy pathway for H2adsorption and desorption via electron accumulation ***,presence of the Pt nanoparticles tunes the electronic states of the MoSe2based catalyst,resulting in the enhanced HER activity at heterointerface of 1T/2H MoSe2 while facilitating the hydrogen adsorption and desorption process providing a low energy pathway for *** results provide new insight on atomic level understanding of the MoSe2based catalyst for HER application.

关键词： 2D materials electrocatalysis HER mixed phase MoSe2

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Deformation behavior of SmCo nanograin magnets via amorphization and recrystallization

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Journal of Rare Earths 2025年第4期43卷 758-765,I0005页

作者： Wei Quan Longfei Ma Yanbai Chen Niuniu Wang Hubin Luo Qiang Zheng Juan Du Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai200444China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China

In recent years,high coercivity nanocrystalline magnets based on the critical single domain size theory have received increasing ***,nanocrystalline magnets are difficult to enhance the remanent magnetization by forming textures with conventional magnetic field *** of nanocrystalline magnets is usually done using the hot pressing and hot deformation technique,but there are some difficulties in applying this technique to form texture in SmCo *** discover and solve the difficulties of obtaining texturized nanocrystalline magnets during the deformation process,samarium cobalt magnets with different degrees of deformation were first experimentally prepared by low strain rate hot deformation ***,molecular dynamics simulations were utilized to study the micro structural changes and the multi-phase formation process during hot *** process of deformation together with the reason why it is difficult to form textures in SmCo systems by lowtemperature hot deformation is discussed,and the strain energy densities of SmCo multiphase in multiple directions were calculated,which gives a feasible method to form low-temperature hot deformation textures in SmCo systems experimentally.

关键词： Rare earths SmCo permanent magnet Phase transformation Molecular dynamics simulation Deformation texture

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Static recrystallization behavior of cold-rolled AZ31 Mg alloy with high density of shear bands and{101^(-)1}twins

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Journal of Central South University 2025年第3期32卷 727-743页

作者： CHENG Zong-yuan PENG Jin-hua FANG Tao ZANG Qian-hao CHEN Liang-yu LU Sheng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Foshan(Southern China)Institute for New Materials Foshan 528000China

Cold-rolling was conducted on AZ31 magnesium alloy with fine and coarse grains to produce plates with high density of shear bands and{101^(-)1}twins,***,these two kinds of plates are subjected to isothermal annealing to reveal the effect of shear bands and{101^(-)1}twins on recrystallization *** annealing,static recrystallization occurs firstly in shear band zones and{101^(-)1}twin zones,which has different effect on texture and mechanical *** the increase of annealing temperature,strong basal texture remains in annealed SG-17%while the basal texture is weakened gradually in annealed LG-15%.Recrystallized grains from twin zones have a random orientation which is responsible for the weakened basal texture in annealed LG-15%.In addition,microhardness decreases gradually with the prolonged annealing time due to static ***-15%has a lower recrystallization activation energy because{101^(-)1}twins are in favor of the nucleation and growth of recrystallized *** 500℃annealing,the yield strength decreases significantly with a significant improvement in failure *** annealed LG-15%has a much higher compressive strain than the annealed SG-17%due to texture weakening effect.

关键词： cold-rolling isothermal annealing twinning texture yield strength

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An ultra-high strength and toughness as-cast Mg-10Gd-1.7Y-1Zn-0.5Zr alloy

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Journal of Magnesium and Alloys 2025年第2期13卷 894-901页

作者： Haijun Wang Renju Cheng Bin Jiang Mingbo Yang Daiyi Deng Zhihua Dong Jiangfeng Song Chuntang Yu Linjiang Chai Fusheng Pan College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

An ultra-high strength and toughness as-cast Mg-10Gd-1.7Y-1Zn-0.5Zr(wt.%)alloy was prepared via special ultrasonic melt treatment,and the peak-aged(200℃for 48 h)ultimate tensile strength(UTS),yield strength(YS)and elongation(EL)at room temperature reaches 430 MPa,324 MPa,and 13.6%,*** ultrasonic treatment during semi-solid conditions refines the grains and hinders the growth of the divorced eutectic phases(α-Mg+Mg_(3)Gd)during *** the solution treatment,the refined Mg_(3)Gd phase suppresses the formation of cubic-shaped GdY phases and block 14H long period stacking structure(14H-LPSO)phases,and further increases solute concentration in the *** solute atoms promote the growth ofβ′plates with an increased aspect ratio of 8:1,which can increase critical resolved shear stress(CRSS),YS and work hardening *** is that found the aspect ratio ofβ′plates are mainly responsible for the improvement in the strength of the alloy under the same composition and heat treatment conditions.

关键词： Magnesium alloys Mechanical properties Strengthening mechanism Ultrasonic treatment

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Effects of Ag/Sc microadditions on the precipitation of over-aged Al-Zn-Mg-Cu alloys

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材料科学技术（英文版） 2025年第6期209卷 219-229页

作者： Yong-You Kim Kwangjun Euh Su-Hyeon Kim Hyeon-Woo Son Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508the Republic of Korea Advanced Materials Engineering University of Science and TechnologyDaejeon 34113the Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508the Republic of Korea

Microalloying addition plays a significant role in controlling the characteristics of precipitates in Al *** study investigates the effects of Ag and Sc microalloying addition on the thermal stability of Al-Zn-Mg-Cu alloys,via differential scanning calorimetry,transmission electron microscopy,and atom-probe *** results demonstrate that Ag and Sc additions increase the number density of η-MgZn2 type nano-precipitates(formed during heat treatment)by forming direct(Mg-Ag phase,prototype of precipitate)or indirect precursors(Al2Sc phase,constituent of precipitate)for the *** addition,the Ag and Sc elements can effectively prevent the coarsening of η precipitates and facilitate the high-density distribution of fine η precipitates,during the over-aging period,improving the thermal stability of the Al-Zn-Mg-Cu *** thermal stability is particularly improved by Ag addition because Ag atoms directly prevent the coarsening of η precipitates by hindering Zn diffusion into the *** the contrary,Sc addition indirectly prevents the coarsening of η precipitates by depleting the solute species from the Al matrix,enabling abundant precipitates limited *** Ag addition improves precipitation strengthening by preventing the coarsening of precipitates during over-aging.

关键词： Aluminum alloys Microalloying Precipitation Atom-probe tomography Thermal stability

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Post-tunable salt gel electrolytes toward flexible supercapacitor switches

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Journal of Energy Chemistry 2025年第1期100卷 114-124页

作者： Hui Wang Shuang Chen Xuming Liu Qin Zhang Xin Liu Polymeric and Soft Materials Laboratory School of Chemistry and Life Science and Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012JilinChina Polymeric and Soft Materials Laboratory School of Chemical Engineering and Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012JilinChina

Convertible hydrogel supercapacitors have emerged as promising energy storage devices in switches,diodes,and ***,inherent weaknesses in ionic conductivity,mechanical properties,and water retention of hydrogel electrolytes seriously hinder their *** by the hardness conversion of sea cucumber skin,a conductivity and mechanics dual-tunable salt gel electrolyte is successfully *** salt gel presents a reversible switching of conductors-insulators and a mechanical regulation between softness and hardness via the dissolution-crystallization transition of sodium acetate trihydrate(SAT).Meanwhile,the salt gels spontaneously grow a layer of“armor”through saturated phase-change salt crystals effectively reducing water evaporation of hydrogel ***,this phase-change soft-rigid conversion strategy will expand the capabilities of gel-based flexible supercapacitors(area capacitance:258.6 mF cm^(-2)),and the capacitance retention rate could still reach 86.9%after 3000 cycles at high ***,the salt gel supercapacitor is potentially used in over-heat alarm *** is anticipated that the strategy of conductivity and mechanics of dual-tunable salt gel would provide a new perspective on the development of energy storage devices,wearable electronics,and flexible robots.

关键词： Supercapacitors Salt gels Reversible phase transition Post-tuning Conductivity switching

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Research progress of lignin-derived materials in lithium/sodium ion batteries

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Green Energy & Environment 2025年第2期10卷 322-344页

作者： Jingke Zhang Hengxue Xiang Zhiwei Cao Shichao Wang Meifang Zhu Institute of Hybrid Materials National Center of International Research for Hybrid Materials TechnologyNational Base of International Science&Technology CooperationCollege of Materials Science and EngineeringQingdao UniversityQingdao266071China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

With the increase of energy consumption,the shortage of fossil resource,and the aggravation of environmental pollution,the development of cost-effective and environmental friendly bio-based energy storage devices has become an urgent *** the second most abundant natural polymer found in nature,lignin is mainly produced as the by-product of paper pulping and bio-refining *** possesses several inherent advantages,such as low-cost,high carbon content,abundant functional groups,and bio-renewable,making it an attractive candidate for the rechargeable battery ***,there has been a surge of research interest in utilizing lignin or lignin-based carbon materials as the components of lithium-ion(LIBs)or sodium-ion batteries(SIBs),including the electrode,binder,separator,and *** review provides a comprehensive overview on the research progress of lignin-derived materials used in LIBs/SIBs,especially the application of lignin-based carbons as the anodes of LIBs/*** preparation methods and properties of lignin-derived materials with different dimensions are systemically discussed,which emphasizes on the relationship between the chemical/physical structures of lignin-derived materials and the performances of LIBs/*** current challenges and future prospects of lignin-derived materials in energy storage devices are also proposed.

关键词： Lignin-based carbons Lithium battery Sodium battery Chemical structure evolution

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Superior electro-catalytic performance achieved by the negatively charged boron atom on BC3/TM/graphene sandwich heterostructures

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材料科学技术（英文版） 2025年第4期207卷 255-265页

作者： Juan Xie Jiawen Wang Yunpeng Shu Juan Yang Youyong Li Huilong Dong School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Institute of Functional Nano & Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macau University of Science and TechnologyTaipa 999078Macau SARChina School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China National Center for International Research on Intelligent Nano-Materials and Detection Technology in Environmental Protection Soochow UniversitySuzhou 215123China

The sandwich heterostructures(SHSs)are novel two-dimensional materials that hold great potential as efficient *** this work,we computationally designed the BC3/TM/Gr SHSs by intercalat-ing transition metal atoms into the BC3/graphene *** the computational screening,only BC3/Sc/Gr,BC3/Ti/Gr,BC3/Y/Gr and BC3/Zr/Gr are validated as stable *** electron donation from the intercalated TM atom results in the formation of the negatively charged boron atom(Bδ-)and activation of the BC3 surface,making the BC3/TM/Gr SHSs highly promising as single-atom catalysts(SACs).The BC3/Sc/Gr and BC3/Y/Gr SHSs exhibit potential in carbon dioxide reduction reaction(CO2RR)and carbon monoxide reduction reaction(CORR)***,when BC3/Y/Gr SHS serves as CORR electro-catalyst,the step(*CHO→*CHOH)is a potential determining step,with an extremely low limiting potential(UL=-0.10 V).The BC3/Ti/Gr and BC3/Zr/Gr SHSs are suitable as hydrogen evolution reaction(HER)***,the BC3/Ti/Gr SHS serves as an ideal HER electro-catalyst in acid condi-tion,with close-to-zero adsorption free energy(ΔGH=0.006 eV)and fairly low overall activation barrier(0.20 eV).By analyzing the electronic properties,the unique adsorption activity of the Bδ-on H atom and unsaturated CO2RR intermediates is elucidated as the origin of excellent catalytic activity of BC3/TM/Gr SHSs,which is modulated by the intercalated TM *** work is instructive to rational design of SACs towards energy conversion based on non-metal elements.

关键词： Single-atom catalysts Heterostructure Transition metal intercalation DFT calculation CO2 reduction Hydrogen evolution reaction

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Simultaneous achievement of large strain, low hysteresis, and high-temperature stability in textured BT-based piezoelectric ceramics

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Journal of Advanced Ceramics 2025年第2期14卷 131-139页

作者： Xiyue Zhang Zhe Wang Peng Li Yingchun Liu Juan Du Jigong Hao Wei Li Jiwei Zhai School of Materials Science and Engineering Laboratory of Sensitive Materials and Devices Shandong Department of EducationLiaocheng UniversityLiaocheng 252059China Functional Materials and Acoustooptic Instruments Institute Harbin Institute of TechnologyHarbin 150080China School of Materials Science and Engineering Tongji UniversityShanghai 201804China

BaTiO_(3) (BT)-based piezoceramics with large temperature-stable strains and low hysteresis are urgently needed for high-precision actuators because of increasing environmental problems. Here, tetragonal [001]c-textured (Ba_(0.98)Ca_(0.02))(Ti_(0.96)Sn_(0.04))O_(3) (BCTS) ceramics with a texture degree (F_(001)) of ~98% were obtained via the templated grain growth (TGG) method. A large maximum unipolar strain (S_(max)) of ~0.24% with a low strain hysteresis (Hs) of ~3.8% and an optimized piezoelectric strain coefficient (d_(33)^(*)) of ~1124 pm·V^(−1) are simultaneously achieved in the textured BCTS ceramics. Moreover, the variation in the strain response is less than 20% from room temperature (RT) to 100℃ for the textured ceramics. The underlying mechanism for the optimized strain performance could be attributed to the synergetic effect of the polarization extension and a fine domain structure. This work provides new insight for achieving a balance of multiple strain properties (large strain, low hysteresis, and high-temperature stability) in BT-based ceramics, showing the widespread application prospects of lead-free ceramics in high-precision actuators.

关键词： textured ceramics strain performance hysteresis temperature stability

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