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Laser-Directed Energy Deposition-Induced Hierarchical Multiscale Microstructures With In Situ L12 Nanoprecipitates and Core-Shell Structures in a Medium-Entropy Alloy 认领 引用
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作者 Nan Wang Yang Lv +9 位作者 Hongge Li Tianxu Zhao Yonggang Sun Pengcheng Che Zehao Li Yihang Zhou Zhiliang Ning Jianfei Sun Tung Lik Lee Yongjiang Huang 《Rare Metals》 SCIE EI CAS CSCD 2026年第5期558-572,共15页
Simultaneously achieving high strength,adequate ductility,and low anisotropy remains challenging for additively manufactured medium-entropy alloys(MEAs),particularly without relying on post-processing.Here,a CO28Cr... Simultaneously achieving high strength,adequate ductility,and low anisotropy remains challenging for additively manufactured medium-entropy alloys(MEAs),particularly without relying on post-processing.Here,a CO28Cr18Ni42Al6Ti6 MEA was fabricated by laser-directed energy deposition(LDED),enabling effective in situ strengthening through nonequilibrium solidification and intrinsic thermal cycling.As a result,a hierarchical microstructure was developed,consisting of fine-grain clusters enriched with high-angle grain boundaries,coherent L12 nanoprecipitates,and distinctiveγ-Al2O3/β-Ti core-shell structures.Fine-grain clusters together with spatially distributed heterogeneities contributes to the reduced mechanical anisotropy.As a result,the alloy exhibited high strength while retaining good ductility,exhibiting yield strengths of 880±6.2 MPa and 850±7.2 MPa,ultimate tensile strengths of 1200±32.1 MPa and 1150±55.4 MPa,and fracture elongations of 19%±3.5%and 21%±5.5%along the building and scanning directions,respectively.The enhanced mechanical performance was attributed to multiscale strengthening arising from the synergistic L12 nanoprecipitates and core-shell structures,which impeded dislocation motion across multiple length scales while accommodating interfacial strain,thereby sustaining work hardening and retaining ductility. 展开更多
关键词 core-shell structures L12nanoprecipitates mechanical properties medium entropy alloy multiscale hierarchical microstructure
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Preparation and characterization of cross-linked β-cyclodextrin polymer/Fe_3O_4 composite nanoparticles with core-shell structures 认领 引用 被引量：7
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作者 Rui Xue Li Shu Mei Liu +2 位作者 Jian Qing Zhao Hideyuki Otsuka Atsushi Takahara 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第2期217-220,共4页
Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparti... Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparticles inβ-cyclodextrin alkaline solution by using epichlorohydrin as crosslinking agent.The morphology,structure and magnetic properties of the prepared composite nanoparticles were investigated by transmission electron microscopy（TEM）,Fourier transform infrared（FTIR） spectrometry,X-ray diffraction（XRD） measurement,thermogravimetric analysis（TGA） and Vibrating sample magnetometry （VSM）,respectively. 展开更多
关键词 Cross-linkedβ-cyclodextrin polymer Fe3O4 nanoparticles Composite nanoparticles Core-shell structures
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Effect of elastic strain energy on the core-shell structures of the precipitates in Al-Sc-Er alloys 认领 引用 被引量：3
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作者 陈思成 李长荣 +2 位作者 连广丽 郭翠萍 杜振民 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第12期1276-1280,共5页
The effect of the elastic strain energy on the core-shell structures was studied in an Al-0.06Sc-0.02Er （at.%） alloy. A theoretical model for the calculation of the elastic strain energy caused by core-shell precipi... The effect of the elastic strain energy on the core-shell structures was studied in an Al-0.06Sc-0.02Er （at.%） alloy. A theoretical model for the calculation of the elastic strain energy caused by core-shell precipitates, which is applicable to materials with weak elastic anisotropy, was adopted. It was demonstrated that the partitioning of Er to the precipitate core did not reduce the elastic strain energy as expected in the previous study. The resistance due to the elastic strain energy to form an Al3（Sc0.36Ero.64）-Al3（Sc0.8Er0.2） core-shell precipitate was quite small, and could be easily overcome by the decrease of the total interracial energy, which was consistent with the previous experimental results. On the other hand, the resistance due to the elastic strain energy to form an Al3Er-Al3Sc core-shell precipitate was much larger than that to form an Al3（Sc0.36Er0.64）-Al3（Sc0.8Er0.2） core-shell precipitate, thus the partitioning of all the Er atoms to the core was strongly hindered by the elastic strain energy and was not observed in the experiment of the previous study. 展开更多
关键词 aluminum alloys precipitation core-shell structure elastic strain energy rare earths
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Effect of milling process on the core-shell structures and dielectric properties of fine-grained BaTiO3-based X7R ceramic materials 认领 引用 被引量：3
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作者 Tian Wang Xiao-hui Wang +1 位作者 Hai Wen Long-tu Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2009年第3期345-348,共4页
Fine-grained BaTiO3-based X7R ceramic materials were prepared and the effects of milling process on the core-shell structures and dielectric properties were investigated using scanning electron microscope,transmission... Fine-grained BaTiO3-based X7R ceramic materials were prepared and the effects of milling process on the core-shell structures and dielectric properties were investigated using scanning electron microscope,transmission electron microscope,and energy dispersive spectroscopy(EDS).As the milling time extends,the dielectric constant of the ceramics increases,whereas the temperature coefficient of capacitance at 125℃drops quickly.The changes in dielectric properties are considered relevant to the microstructure evolution caused by the milling process.Defects on the surface of BaTiO3 particles increase because of the effects of milling process,which will make it easier for additives to diffuse into the interior grains.As the milling time increases,the shell region gets thicker and the core region gets smaller;however,EDS results show that the chemical inhomogeneity between grain core and grain shell becomes weaker. 展开更多
关键词 fine-grain barium titanate core-shell structure milling process microstructure capacitor
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Evolution of three-shell onion-like and core-shell structures in(AgCo)201 bimetallic clusters 认领 引用 被引量：5
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作者 王强 李国建 +2 位作者 李东刚 吕逍 赫冀成 《Chinese Physics B》 SCIE EI CAS 2009年第5期1843-1849,共7页
This paper studies the structural evolution of （AgCo）201 clusters with different Co concentrations under various temperature conditions by using molecular dynamics with the embedded atom method. The most stable posi... This paper studies the structural evolution of （AgCo）201 clusters with different Co concentrations under various temperature conditions by using molecular dynamics with the embedded atom method. The most stable position for Co atoms in the cluster is the subsurface layer at low temperature （lower than 200 K for the Ag200Col cluster）. The position changes to the core layer with the increase of temperature, but there is an energy barrier in the middle layer. This makes the Ag-Co cluster form an Ag Co-Ag three-shell onion-like configuration. When the temperature is high enough [higher than 800 K for （AgCo）2m clusters with 50% Co], Co atoms can obtain enough energy to overcome the energy barrier and the cluster forms an Ag-Co core-shell configuration. Amorphization for the onion-like and core-shell clusters is induced by the large lattice misfit at Ag-Co interfaces. The structural evolution in the Ag-Co cluster is related to the release of excess energy. 展开更多
关键词 bimetallic cluster structure molecular dynamics
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Recent Progress in Rationally Engineered Core-Shell Structures of Upconversion Nanoparticles for Luminescence-Enhanced and Versatile Imaging 认领 引用 被引量：1
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作者 Pan Sheng Jiayu Zeng +3 位作者 Changwen Li Qian Dong Jiaxiang Xiao Zhuo Chen 《Journal of Analysis and Testing》 EI CSCD 2026年第1期1-24,共24页
Near-infrared(NIR)-excited lanthanide-doped upconversion nanoparticles(UCNPs)with core-shell structures present an intriguing system because of their exceptional luminescent properties and wide range of imaging applic... Near-infrared(NIR)-excited lanthanide-doped upconversion nanoparticles(UCNPs)with core-shell structures present an intriguing system because of their exceptional luminescent properties and wide range of imaging applications.In this review,we establish a nanostructure-engineering framework that systematically correlates luminescence modulation with imaging uses for NIR-excited lanthanide-doped UCNPs by linking surface defect passivation,energy migration optimization,and interface engineering optimization to specific optical outcomes,such as enhanced quantum yield,tunable multicolor emission,and photostability.These luminescence modulation strategies enable core-shell nanostructures to overcome the limitations of single-component materials.They support trace substance detection,high-security optical information encryption,biomedical detection and imaging-guided therapy,as well as the development of durable wearable devices.Additionally,we summarize their emerging imaging technologies,such as full-color displays and super-resolution imaging.Finally,we identify key challenges in this field,such as synthesis complexity,biocompatibility,and stability in complex environments,and propose potential solutions.We expect that NIR-excited UCNPs with core-shell structures will drive innovation in versatile imaging technologies. 展开更多
关键词 Upconversion nanoparticles Core-shell nanostructures Luminescence modulation Nanostructure engineering Versatile imaging
The interface engineering strategy assists the 3D core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres to achieve significant overall water splitting 认领 引用 被引量：3
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作者 Jun Yu Yangping Zhang +6 位作者 Nannan Zhang Jie Li Huiyu Sun Xinyu Gu Changqing Ye Tianpeng Liu Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期570-576,共7页
Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral ... Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres electrocatalyst was constructed on nickel foam(NF)via an interfacial engineering strategy.This 3D core-shell heterostructure maximizes the exposure of active sites,optimizes the charge transport pathway and accelerates gas release rates.The protective shell strategy of NiFe LDH provides favorable stability,which contributes to inhibiting the electrochemical corrosion of the electrocatalyst and mitigating the toxic effects of Cl- and other microorganisms during the seawater splitting process.Moreover,the introduction of NiFe LDH induces a change in the OER mechanism from an adsorption evolution mechanism(AEM)to a lattice oxygen mechanism(LOM),which improves the intrinsic activity of the catalyst.Consequently,Co3S4/CuS@NiFe LDH demonstrates exceptional performance in the oxygen evolution reaction(OER)(η100=251 mV)and in the hydrogen evolution reaction(HER)(η100=254 mV),alongside remarkable stability over 100 h.For OWS,it exhibits a voltage of 1.46 V at 10 mA/cm2 and maintain stability for 100 h.Impressively,Co3S4/CuS@NiFe LDH still possesses outstanding activity and stability in natural alkaline seawater.This work proposes interfacial engineering to construct bifunctional catalysts with core-shell heterostructures,providing instructive guidelines for the design of highly efficient electrocatalysts toward seawater electrolysis. 展开更多
关键词 Core-shell structure Layered double hydroxides Transition metal sulphides Bifunctional catalyst Overall water splitting Overall seawater splitting
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Design and Phase-Field Simulation of Core-Shell Microstructure in TiNb Binary Alloy 认领 引用
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作者 Chen Gongyu Cheng Li +2 位作者 Liu Zihan Zhang Gang Zhu Jiaming 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第5期1129-1136,共8页
The core-shell structure in bulk TiNb binary alloy was designed and studied by phase-field simulations,where various core-shell structures were obtained by precise control of the initial and boundary conditions of the... The core-shell structure in bulk TiNb binary alloy was designed and studied by phase-field simulations,where various core-shell structures were obtained by precise control of the initial and boundary conditions of the TiNb binary alloy system during spinodal decomposition,and then the formation mechanism of core-shell structure was revealed.In addition,the influences of initial temperature gradient,average temperature,and initial concentration distribution of the system on the core-shell structure were investigated.Results show that the initial concentration gradient is the key factor for forming the core-shell structure.Besides,larger initial temperature gradient and higher average temperature can promote the formation of core-shell structure,which can be stabilized by adjusting the initial concentration distribution of the Nb-rich region in TiNb binary alloy.As a theoretical basis,this research provides a novel and simple strategy for the preparation of TiNb-based alloys and other materials with peculiar core-shell structures and desirable mechanical and physical properties. 展开更多
关键词 TiNb binary alloy phase-field simulation spinodal decomposition core-shell structure microstructure evolution
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Identification of an(AlNi2)@(YNi3+Cr2O3+Hf)heterogeneous nano core-shell structure and triple oxide barrier in enhancing thermal stability in Fe18Co18Cr18Ni36Al9Y0.5Hf0.5high-entropy coatings 认领 引用
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作者 Zekun Xu Yanhui Hou Guangqiang Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第4期1187-1202,I0006,共16页
This study innovatively prepared a high-performance Fe18Co18Cr18Ni36Al9Y0.5Hf0.5high-entropy alloy coating via laser cladding.The coating features a stable face-centered cubic(FCC)solid solution p... This study innovatively prepared a high-performance Fe18Co18Cr18Ni36Al9Y0.5Hf0.5high-entropy alloy coating via laser cladding.The coating features a stable face-centered cubic(FCC)solid solution phase and a unique nanoscale(AlNi2)@(YNi3+Cr2O3+Hf)core-shell structure.The study also proposed a triple oxide barrier design using Cr,Y,and Al,enhancing oxide stability and compactness.The oxide layer forms Cr2O3outer shell and Al2O3+Y2O3bonding layer,effectively blocking oxygen and reducing oxidation rate.This structure promotes Hf distribution and rare earth element activity.The high-entropy alloy with this nano core-shell structure,featuring a Cr2O3outer shell,an Al2O3and Y2O3triple oxide barrier bonding layer and uniformly dispersed rare earth elements,effectively prevents further contact between oxygen and metal,and reduces the oxidation rate. 展开更多
关键词 High-entropy alloys coatings Laser cladding Nano core-shell structure Oxidation resistance Rare earths
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Ultra-low Pt core-shell electrocatalysts:Noble metal core from irregular binarity to structure-shape-selectivity multielement 认领 引用
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作者 Xuemei Wang Tianlai Hou +4 位作者 Xin Ba Ruixin Wang Haiping Xu Songrui Wang Fanpeng Kong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期298-316,I0008,共19页
Highly efficient low-Pt loading electrocatalysts towards oxygen reduction reaction(ORR)is urgent for advanced membrane electrode assemblies(MEA),directly determining the deployment of low-temperature fuel cells.For OR... Highly efficient low-Pt loading electrocatalysts towards oxygen reduction reaction(ORR)is urgent for advanced membrane electrode assemblies(MEA),directly determining the deployment of low-temperature fuel cells.For ORR,only exposed Pt atoms catalyze molecular oxygen reduction into water,signifying that interior Pt atoms are theoretically replaced by cheaper metals.Core-shell structure is well-known as an ideal model to solve this challenge where Pt atoms mainly locate at the(near-)surface region.Additionally,interior core presents a promising promoter role towards d-band center of Pt shell by short-range ligand effect and long-range strain effect,both which is affected by their large difference in electronegativity and lattice mismatch,respectively.Therefore,the adsorption energy of oxygenated species on Pt shell surface is theoretically optimized by well-designed core structure.In this review,the development of low Pt loading core-shell electrocatalysts is systematically summarized.The effect of composition,shape,element distribution and anisotropy on performance and corresponding enhancement mechanism is also discussed in depth.This review provides an encouraging guideline to fabricate high-performance low-Pt loading core-shell electrocatalysts. 展开更多
关键词 Oxygen reduction Core-shell Strain structure Electronic effect
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Synergism of highly graphitic N-doped graphene-like carbon and Pt@PtCo core-shell structure for efficient oxygen reduction reaction 认领 引用
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作者 Congyue Sun Yuqing Zhang +3 位作者 Longfei Xia Dongyan Xu Xiaojin Li Ke Ye 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第6期185-195,共11页
It is crucial to develop efficient,highly durable platinum‑based oxygen reduction reaction(ORR)catalysts to advance fuel cell development.In this study,a series of N‑doped graphene‑like carbon(NGC)materials was synthe... It is crucial to develop efficient,highly durable platinum‑based oxygen reduction reaction(ORR)catalysts to advance fuel cell development.In this study,a series of N‑doped graphene‑like carbon(NGC)materials was synthesized by pyrolyzing a mixture of glucose and graphitic carbon nitride(g‑C3N4),with g‑C3N4acting as both a structural template and a nitrogen source.An NGC material containing approximately 6.9%N was obtained at a mass ratio of 4:1 for g‑C3N4to glucose and a pyrolysis temperature of 900℃.PtCo alloy nanoparticles were homogeneously anchored onto NGC via an impregnation‑ethylene glycol reduction method.A core‑shell structured catalyst consisting of a Pt shell surrounding a PtCo alloy core was subsequently fabricated by annealing the PtCo/NGC composite at 700℃.The resulting Pt@PtCo/NGC catalyst exhibits superior ORR activity,with mass activity 3.22 and 3.25 times higher than that of a commercial Pt/C catalyst under acidic and alkaline conditions,respectively.Furthermore,the ORR mechanism was systematically investigated through combined material characterization,electrochemical analysis,and DFT calculations,providing deeper insight into the electrocatalytic structure‑activity relationship. 展开更多
关键词 Oxygen reduction reaction Pt@PtCo core-shell N-doped carbon Fuel cells Nanoparticles Catalyst
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In situ exploration of oxygen electrocatalysis using core-shell nanostructure-enhanced Raman spectroscopy 认领 引用
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作者 Zhengxin Qian Jishuang Zeng +5 位作者 Sen Zhao Qingna Zheng Jinghua Tian Qingchi Xu Hua Zhang Jianfeng Li 《Nano Materials Science》 EI CAS CSCD 2026年第4期873-885,共13页
Advancements in fuel cells and water electrolyzers have significantly bolstered the utilization of hydrogen energy.Notably,the oxidation and reduction processes of oxygen at the electrode—termed oxygen evolution reac... Advancements in fuel cells and water electrolyzers have significantly bolstered the utilization of hydrogen energy.Notably,the oxidation and reduction processes of oxygen at the electrode—termed oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)—manifest sluggish reaction kinetics,thus requiring noble metals as catalysts,which considerably impedes system efficiency and cost.The imperative for enhancing reaction rates and diminishing overpotential necessitates the development of effective catalysts,which strongly depends on the mechanistic understanding of these reactions at the molecular level.Therefore,this review summarizes our recent efforts in utilizing in situ enhanced Raman spectroscopy,especially the borrowing surface-enhanced Raman spectroscopy(SERS)strategy,shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS),and the SHINERS-satellite strategy,to capture oxygen intermediate species as a bridge to investigate the molecular mechanisms of OER and ORR.Combining in situ SERS with other characterization techniques and theoretical simulation,the structural evolution of active sites and intermediates,including*OOH,*OH,*OO,etc.,during OER/ORR has been monitored under reaction conditions,and the reaction mechanisms together with structureactivity correlations have been identified at the molecular level.These findings may provide a pivotal scientific foundation towards the discovery of better materials for electrochemical hydrogen energy. 展开更多
关键词 Surface-enhanced Raman spectroscopy Oxygen evolutioneduction reaction Reaction mechanism In-situ characterization Core-shell nanostructures
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Preparation and performance evaluation of self-degrading core-shell structure temporary plugging agent 认领 引用 被引量：1
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作者 Jia-Rui Li Ling Lin +4 位作者 Lei Li Hao Lu Cheng-Yuan Xu Xin-Min Zhang Wen Ren 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2017-2029,共13页
Temporary plugging agents(TPAs)are widely used in oilfield development due to their self-removal after operations and their minimal effect on reservoirs.However,the current methods used to remove TPAs may damage the r... Temporary plugging agents(TPAs)are widely used in oilfield development due to their self-removal after operations and their minimal effect on reservoirs.However,the current methods used to remove TPAs may damage the reservoir.To address this,a self-degradable TPA for 120℃conditions was prepared and tested in this study.Using acrylamide(AM)as the base monomer,along with polyethylene glycol diacrylate(PEGDA)and N,N′-methylenebisacrylamide(MBA)as crosslinkers,a crosslinked shell was synthesized.The degradation time of this shell can be adjusted by changing the ratio of two crosslinking agents.The shell served as a shielding layer to encapsulate polylactic acid(PLA),thereby delaying the latter's degradation.Experimental results confirmed that the TPA had a core–shell structure and exhibited good compatibility with base slurry.At a concentration of 0.5%,it effectively reduced filtration volume of base slurry.Furthermore,the TPA showed favorable plugging performance and pressure-bearing capacity.As the ratio of the two crosslinking agents varied,the water absorption capacity of the TPA exhibited an increasing trend,and its degradation duration at 120℃ranged from 60 to 72 h.FT-IR and SEM analyses revealed structural changes of the TPA in the degradation process.All test results demonstrated that degradation primarily occured through the cleavage of amide and ester bonds,leading to the rupture of crosslinking points. 展开更多
关键词 Shielding temporary plugging Self-degradation Core-shell structure Polylactic acid
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Core-shell structured CoFe-PBA@NiFe-LDH as efficient electrocatalysts for oxygen evolution reaction 认领 引用
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作者 Guang-Long Wang Jun-Hui Cao +7 位作者 Shu-Sen Hou Yu Zhang Hu Zhou Chun Ouyang Long-Feng Lin Yan-Xin Qiao Yi-Shan Jiang Qi-Chao Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期158-167,共10页
NiFe-based layered double hydroxide(NiFe-LDH)nanosheets were hydrothermally anchored onto the surface of CoFe-based Prussian blue analogue(CoFe-PBA)nanocubes,resulting in the formation of core-shell-structured CoFe-PB... NiFe-based layered double hydroxide(NiFe-LDH)nanosheets were hydrothermally anchored onto the surface of CoFe-based Prussian blue analogue(CoFe-PBA)nanocubes,resulting in the formation of core-shell-structured CoFe-PBA@NiFe-LDH.Electrochemical characterizations revealed that this material exhibits exceptional oxygen evolution reaction(OER)activity coupled with remarkable long-term stability in alkaline media.The optimized CoFe-PBA@NiFe-LDH catalyst achieves a low OER overpotential of 287 mV to reach a current density of 10 mA cm−2,accompanied by a favorable Tafel slope of 77 mV dec−1.Notably,the catalyst can maintain the initial catalytic activity even after 18 h of continuous operation,with its morphology and crystalline structure remaining well-preserved.The superb electrocatalytic performance is fundamentally attributed to the synergistic core-shell architecture,where the uniform decoration of NiFe-LDH nanosheets on CoFe-PBA nanocubes maximizes the exposure of abundant and highly accessible active sites while facilitating the mass transport of reactive intermediates. 展开更多
关键词 Oxygen evolution reaction Electrocatalyst Core–shell structure Prussian blue analogue Layered double hydroxide
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Refinement of Mg2Si in Mg-Al-Si alloys through Ca and Y additions:A novel core-shell structure evolution mechanism and enhanced mechanical properties 认领 引用
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作者 Jinhui Huang Shuhong Liu +3 位作者 Zheyuan Liu Xuezhen Che Martin Friák Yong Du 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期328-343,共16页
Comprehensive experimental and theoretical investigations on microstructure and mechanical properties were conducted to explore the refinement of Mg2Si in Mg-Al-Si alloys through the addition of Ca and Y.Alloys of ... Comprehensive experimental and theoretical investigations on microstructure and mechanical properties were conducted to explore the refinement of Mg2Si in Mg-Al-Si alloys through the addition of Ca and Y.Alloys of Mg-Al5.5-Si9.5-Cax(x=0,0.05,0.1,0.15,wt.%)and Mg-Al5.5-Si9.5-Yx(x=0,0.3,0.6,0.9,wt.%)were designed based on the CALPHAD(CALculations of PHAse Diagram)calculations and literature data.With the experimentally determined optimal individual addition of 0.1 wt.%Ca and 0.9 wt.%Y respectively,a crossexperiment involving simultaneous addition of Ca and Y for the refinement of Mg2Si was carried out.The alloy composition with the optimal refinement effect and mechanical properties was identified as Mg-Al5.5-Si9.5-Ca0.1-Y0.6(wt.%).In Y-containing alloys,a novel coreshell structure evolution mechanism of MgSi2Y2//Al4MgY//Mg2Si was proposed based on experimental observation and first principles calculations,revealing MgSi2Y2as the core for the heterogeneous nucleation of Mg2Si. 展开更多
关键词 Mg2Si Core-shell structure Mechanical properties Adsorption Heterogeneous nucleation
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One-Step Core-Shell Structuring of Silicon Graphene Composite Anode Materials by Aqueous Reduced Graphene Oxide:Toward Practical Use of High-Performance Lithium-Ion Battery 认领 引用
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作者 Byeong Guk Kim Jihyeon Ryu +7 位作者 Ki-Hun Nam Sooyeon Jeong Hye Jung Lee Jungmo Kim Dong Gyun Hong Oh Sung Kwon Sunhye Yang Seung Yol Jeong 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第1期34-45,共12页
Carbon coatings for silicon(Si)-based anode materials are essential for designing high-performance Li-ion batteries(LIBs).The coatings prevent direct contact with the electrolyte and enhance anode performance.However,... Carbon coatings for silicon(Si)-based anode materials are essential for designing high-performance Li-ion batteries(LIBs).The coatings prevent direct contact with the electrolyte and enhance anode performance.However,conventional carbon coatings are limited by their volume expansion and structural degradation,which lead to capacity fading and reduced durability.This study introduces a scalable and practical one-step carbon-coating strategy for directly coating silicon suboxide(SiOx)-based materials using aqueous quasi-defect-free reduced graphene oxide(QrGO)without post-treatment,unlike conventional graphene oxide(GO)-based coating methods.This simple process enables uniform encapsulation with QrGO for a highly adhesive and conductive coating.The QrGO-based composite anode material has several advantages,including reduced cracking due to volume expansion and enhanced charge carrier transport,as well as an increased Si content of 20 wt.%compared to the 5 wt.%in typical commercial Si-based active materials.In particular,the capacity retention of the QrGO-coated Si electrodes dramatically increases at high C-rate.The full cell exhibited long-term stability and capacity that were twice that of commercial SiOx-based cells.Therefore,the QrGO-based one-step coating process represents a scalable,transformative,and commercially viable strategy for developing high-performance LIBs. 展开更多
关键词 anode material core-shell structure lithium-ion battery reduced graphene oxide silicon
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Ultrahigh capacitive energy storage in BNT-based polymorphic relaxor ceramics with dense microstructure and core-shell structure 认领 引用
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作者 Changbai Long Ziqian Su +9 位作者 Yang Zhang Zhengwang He Xiaoyang Jiao Kuntong Zhang Fenglong Li Wei Ren Fei Li Laijun Liu Haijun Wu Xiangdong Ding 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期832-842,I0020,共11页
The exploration of eco-friendly dielectric ceramics for electric energy storage has drawn increasing interest due to their wide applications in high/pulsed power electronic systems.However,achieving ultrahigh recovera... The exploration of eco-friendly dielectric ceramics for electric energy storage has drawn increasing interest due to their wide applications in high/pulsed power electronic systems.However,achieving ultrahigh recoverable energy storage density(Wrec≥8 J/cm3)with ultrahigh efficiency(η≥90%)is still a huge challenge for them,restricting the development of ceramic-based energy storage capacitors.Here,comprehensive outstanding energy storage performance is realized in lead-free Bi0.5Na0.5TiO3(BNT)-based ceramics due to collaborative optimization of complex ion doping and viscous polymer process(VPP).Highly dynamic polar nanoregions(PNRs)with the coexistence of rhombohedral(R)+tetragonal(T)phases are formed by Nd3+/Hf4+/Mg2+co-doping at both A and B sites of(Bi0.05Na0.05)0.94Ba0.06TiO3.This,together with the construction of a core-shell structure,ensures a large polarization difference under moderate external electric fields.Furthermore,the optimum composition prepared by VPP exhibits a significant enhancement in dielectric breakdown strength due to its dense microstructure with ultrafine grains and low-concentration defects(e.g.,oxygen vacancies).As a result,excellent energy storage performance with ultrahigh Wrec≈9.38 J/cm3andη≈94.4%is realized in highly dense polymorphic relaxor ceramics under a large electric field of 480 kV/cm.This work provides a two-step cooperative optimization strategy to design advanced ceramic-based dielectric capacitors with great potential for practical energy storage applications. 展开更多
关键词 Lead-free energy storage ceramic capacitors Polar nanoregions(PNRs) Multiphase coexistence Core-shell structure Viscous polymer process(VPP)
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Optimizing the size and electronic effects of core-shell heterostructures via well-constructed Ru clusters encapsulated in N-doped carbon layers 认领 引用
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作者 Min Jie Wang Jiao Yang +10 位作者 Lishan Peng Yongjie Bai Zehui Liu Xiaoliang Yang Huijuan Lu Bingjie Zhou Ningtao Jiang Guoxu He Han-Ming Zhang Liwei Mi Yonghui Deng 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第12期484-489,共6页
The design and development of high-performance electrocatalysts for the hydrogen evolution reaction(HER)are essential for advancing the hydrogen economy.The electronic structure and core size of an electrocatalyst are... The design and development of high-performance electrocatalysts for the hydrogen evolution reaction(HER)are essential for advancing the hydrogen economy.The electronic structure and core size of an electrocatalyst are pivotal for determining the intrinsic activity of the catalytic sites.Interfacial engineering,particularly the formation of well-controlled core-shell heterostructures,has emerged as a promising strategy,although significant challenges remain.Here,we present a series of Ru@NC heterostructures with size-controlled Ru cores encapsulated in N-doped graphene layers.Among these,Ru@NC-3h,with the best holistic effects,has superior durability and mass activity 7.03 times that of Pt/C.This high performance is attributed to the open porous structure,which enhances active site exposure and mass transfer,and the optimized adsorption and desorption of reaction intermediates by the strengthened heterointerfacial interaction between the smaller Ru cores and thin N-doped shells.Attenuated total reflectance surface-enhanced infrared absorption spectroscopy(ATR-SEIRAS)reveals reinforced interfacial water interaction and reduced hydrogen adsorption.Density functional theory(DFT)calculations indicate that the size effect promotes interfacial H2O adsorption,whereas the electronic effect governs *H adsorption to collectively accelerate the HER kinetics.This novel strategy,introduced to regulate heterostructures through size and electronic effects,offers significant potential for various energy material applications. 展开更多
关键词 Hydrogen evolution reaction Interfacial engineering Core-shell heterostructures Holistic effects Density functional theory
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Synergistic Enhancement of Mechanical and Tribological Properties in TiB2/Mo Composites via Core-Shell Structure Mediated Dislocations Migration 认领 引用
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作者 Dongting Li Liyu Zhou +6 位作者 Jie Yu Wanjie Sun Kaiqiang Wang Lu Wang Renquan Wang Chang Liu Ying Liu 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期729-743,共15页
Ceramic reinforcement is crucial for crafting ultrastrong and wear-resistant metallic components.However,pronounced stress concentration and strain incompatibility at ceramic-metal interfaces often trigger microcrack ... Ceramic reinforcement is crucial for crafting ultrastrong and wear-resistant metallic components.However,pronounced stress concentration and strain incompatibility at ceramic-metal interfaces often trigger microcrack initiation and ceramic spalling exacerbating friction under sliding conditions.This study presents a heavily reinforced TiB2/Mo composite(20 vol%TiB2)that exhibits remarkably reduced friction-wear and enhanced strength-ductility synergy.Relying on a"borrowing-dislocations"strategy,the TiB2/Mo composite enables ultrahigh strength and excellent wear resistance-lubrication simultaneously,it provides a gigapascal compressive strength of 1987±45 MPa with an engineering strain of about 19.7%and a high hardness of680±28 HV5 combining the low friction coefficient of 0.332 and wear rate of 3.38×10-5 mm3 N-1 m-1 under 30 N(contact stress 3.1 GPa).These outstanding properties stem from the formation of a Mo-Mo2B-(Mo,Ti)B2 dislocation-slip channel,such a self-assembled core-shell structure with coherent interfacial bonding facilitates dislocation transfer from the metal matrix into the ceramic phase during deformation.The unique core-shell structure effectively mitigates interfacial stress concentration enabling an exceptional combination of strength and ductility.The significant friction reduction is attributed to the in situ formation of a wear-induced oxide film,high damage tolerance,and effective load support during repetitive sliding.This study provides new insights to overcome the strength-ductility trade-off and enhance wear resistance in metal matrix composites via the"borrowing-dislocations"strategy. 展开更多
关键词 core‑shell structure mechanical properties Mo composites tribological properties
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ZIF-Derived Co@Fe-P Electrocatalyst With Core-Shell Structure for Efficient Oxygen Evolution Reaction 认领 引用
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作者 Hongyu Gong Henghui Chen +6 位作者 Wanghuan Duan Yandi Rao Ailing Song Xiaorui Wang Jing Wang Yaru Zhang Tifeng Jiao 《Carbon Energy》 SCIE EI CAS CSCD 2026年第2期34-43,共10页
Rational design of non-noble electrocatalysts with high performance for oxygen evolution reaction(OER)still remains a challenge.In this study,a ZIF-derived electrocatalyst(Co@Fe-P)with a core-shell structure is design... Rational design of non-noble electrocatalysts with high performance for oxygen evolution reaction(OER)still remains a challenge.In this study,a ZIF-derived electrocatalyst(Co@Fe-P)with a core-shell structure is designed by using Co-compounds as the core and PO43-decorated Fe-compounds as the shell.The inner Co-core and outer Fe-shell are connected through Co-O-Fe and Fe-O-P linkage.The Co@Fe-P electrocatalyst exhibits an enhanced performance for OER with a low overpotential(280 mV),low Tafel slope(41.9 mV dec-1)at 10 mA cm-2,and a 60-h durability.The electron transfer from the CoOOH-core to the FeOOH-shell is greatly facilitated,which improves the OER activity of Co@Fe-P kinetically.Theoretical calculations indicate that the interaction of Co-O-Fe and Fe-O-P in Co@Fe-P reduces the overlap between the O 2p and Fe 3d orbitals,which greatly facilitates the transformation from*OH to*O during the OER process via the adsorbate evolution mechanism(AEM)pathway.This finding provides insight for the design of efficient electrocatalysts for OER. 展开更多
关键词 Co@Fe‐P core‐shell structure OER ZIF‐derived electrocatalyst
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