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Aligning nano-scale crystals in bulk materials

science China(Physics,Mechanics & Astronomy) 2025年第4期68卷 211-218页

作者： Xiangyi Zhang Yingxin Hua Xiaohong Li Center for Extreme Deformation Research State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao066004China

Crystal orientation determines various material performances including magnetic,electrical,and mechanical ***,achieving the alignment of nano-grains along a specific crystallographic orientation in bulk materials remains a formidable *** from conventional approaches using polycrystalline materials,we report a strategy to overcome this challenge by deliberately introducing strain-energy anisotropy to select oriented nucleation/growth of crystals in amorphous *** demonstrate its efficacy,we employed ferromagnetic materials as a proof of *** our approach,a range of previously inaccessible bulk ferromagnetic nanomaterials with strong c-axis orientation have been *** resulting bulk oriented nano-grained magnets exhibit a high energy density,168 kJ m^(-3)for Sm Co_(7)and 235.2 kJ m^(-3)for Pr Co_(5)ferromagnets,greatly surpassing that of their state-of-the-art counterparts with 23%-62%*** strategy is general and applicable to other material systems,including thermoelectric,piezoelectric,and ferroelectric materials,to achieve the desired oriented nano-grains for technological applications.

关键词： ferromagnetic materials permanent magnets magnetic properties oriented nano-grains nanocrystalline materials

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Asymmetric charge distribution boosts hydrogen evolution performance in two-dimensional MoO_(2)/MoS_(2)step heterostructure

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Carbon Energy 2025年第2期7卷 172-182页

作者： Mengke Kang Xiang Zhang Jingyi Wang Wen Li Tianyu Xue Kun Zhai Jianyong Xiang Anmin Nie Yingchun Cheng Zhongyuan Liu Center for High Pressure Science State Key Lab of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdaoChina Key Laboratory of Flexible Electronics&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjingChina Department of Chemistry Illinois Institute of TechnologyChicagoIllinoisUSA

Step heterostructures are predicted to hold a profound catalytic performance because of the rearranged electronic structure at their ***,limitations in the morphology of heterostructures prepared by hydrothermal reactions or molten salt-assisted strategies make it challenging to directly assess charge distribution and evaluate a single interface's hydrogen evolution reaction(HER)***,we prepared two-dimensional MoO_(2)/MoS_(2) step heterostructures with a large specific surface area by the chemical vapor deposition *** Kelvin probe force microscopy and electrical transport measurement verified the asymmetric charge distribution at a single *** fabricating a series of micro on-chip electrocatalytic devices,we investigate the HER performance for a single interface and confirm that the interface is essential for superior catalytic *** experimentally confirmed that the enhancement of the HER performance of step heterostructure is attributed to the asymmetric charge distribution at the *** work lays a foundation for designing highly efficient catalytic systems based on step heterostructures.

关键词： charge distribution chemical vapor deposition hydrogen evolution reaction interface step heterostructure

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Dual Parameter SPR Optical Fiber Sensor Based on TiO2 Coating Modulation for Detecting pH-Temperature with Low Crosstalk

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Journal of Lightwave technology 2025年第11期43卷 5320-5328页

作者： Song, Mingshi Jing, Xili Yin, Zhiyong Li, Shuguang Yanshan University State Key Laboratory of Metastable Materials Science & Technology Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Qinhuangdao066004 China

This paper designed a based on surface plasmon resonance (SPR) optical fiber type low crosstalk pH value and temperature sensor. The sensor has the ability to detect pH value and temperature simultaneously, and can overcome the error factor caused by temperature changes in the pH value detection process of optical fiber sensors. Sensor is based on a multimode fiber (MMF) fused with a coreless fiber (NCF) to build the sensing substrate. Ag was used as SPR excitation material and polyacrylic acid (PAA)/ chitosan (CS) composite membrane was used for pH detection. Compared with previous research on temperature compensation, the SPR cascade sensing method treated by TiO2/PDMS composite membrane significantly improved the temperature sensitivity of SPR signals and reduced crosstalk. This ensures that the SPR signal has a sufficient working range. In the range of -10°C ∼ 100°C, the maximum temperature sensitivity can reach -4.1301 nm/°C, and the detection limit (DL) is 0.1542°C. In the pH range of 4.08 ∼ 9.85, the sensor's pH sensitivity can reach up to -17.9359 nm/pH, and the resolution is 0.1272pH. Excellent sensing performance. The sensor is important for advancing future applications of high-precision temperature compensation detection, high-sensitivity pH biodetection, and SPR modulation technology. © 2025 IEEE. All rights reserved.

关键词： Crosstalk

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Microstructure and mechanical properties of high-pressure sintered B6O-SiC nanocomposites

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材料科学技术（英文版） 2025年第1期204卷 238-244页

作者： Bin Zhang Rongxin Sun Pan Ying Song Zhao Yitong Zou Lei Sun Zihe Li Yufei Gao Mengdong Ma Lingyu Liu Chao Liu Bo Xu Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of Education Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Materials and Surface Technology(Ministry of Education) School of Materials Science and EngineeringXihua UniversityChengdu 610039China School of Materials Science and Engineering Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China

Boron suboxide(B6O)is recognized as a superhard material with a low mass density,high resistance to chemical wear,and excellent wear *** its desirable properties,the limited fracture tough-ness of B6O restricts its application in industrial *** study presents the structural and me-chanical characterization of B6O-SiC nanocomposites,which were synthesized via a high-pressure high-temperature sintering process of B6O powders and SiC *** sintering process induced fragmen-tation of SiC whiskers,resulting in the homogenous distribution of SiC fragments within the B6O *** increase in SiC content was observed to decrease the composite's hardness,while initially reducing then enhancing its *** nanocomposites containing 20 wt％and 30 wt％SiC whiskers exhibited significant improvements in fracture toughness,averaging 6.5 MPa m1/2 and 7.0 MPa m1/2,respectively-approximately threefold the toughness of polycrystalline B6O-while sustaining high hardness values of 36.3 GPa and 35.6 GPa on *** analyses revealed that the composites'superior me-chanical performance is due to the presence of strong grain boundaries,as well as a high density of nan-otwins and stacking *** findings demonstrate a viable method for producing B6O-based nanocom-posites with enhanced hardness and toughness,potentially expanding their industrial applicability.

关键词： B6O Ceramic nanocomposite Mechanical properties Microstructure

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Cooperation-doping cobalt and boron on MOF with double cone microrods structure to boost efficient nitrogen fixation in Zn-N_(2)batteries

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Journal of Energy Chemistry 2025年第4期103卷 465-475页

作者： Xin Xu Zaihang Zheng Meili Zheng Songquan Pan Yixin Li Hao Huang Jie Hu State Key Laboratory of Metastable Materials Science&Technology Hebei Key Laboratory of Heavy Metal Deep Remediation in Water and Resource ReuseHebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004HebeiChina

Zn-N_(2)batteries,which are comprised of nitrogen reduction reaction(NRR)and oxygen evolution reaction(OER),represent an emerging technology for efficient ammonia production and simultaneous power ***,the intrinsic limitations of NRR and OER currently preclude its *** this paper,Co and B co-doped Lavoisier framework series materials(MIL)are *** mass transfer is rendered feasible with B_(0.25)-MIL-88-Fe_(4)Co_1 by the distinctive double cone microrods *** addition of soft acid metal node Co^(2+)and B with defective electronic structure modifies the electronic configuration of *** the same time,doping causes defects in the metal-organic frameworks,expands effectively the pore size,and increases the specific surface area,thereby expediting the adsorption of N_(2)and the release of O_(2).The electrocatalysis results show that the dual-doping scheme increases the NH_(3)yield(127.27μg^(-1)h^(-1)mg_(cat)^(-1))and Faraday efficiency(25.81%)while reducing the overpotential of OER(330 mV),achieving a power density of 8.30 mW cm^(-2)for Zn-N_(2)*** discovery implements another avenue for the exploration of Zn-N_(2)battery materials and holds broader significance for advancing the field of energy storage and conversion.

关键词： Nitrogen reduction reaction Oxygen evolution reaction Zn-N_(2)battery Dual doping MOF

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Diamond: cubic to hexagonal

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science China materials 2025年 1-2页

作者： Tian, Yongjun State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

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Influences of Process Parameters and Addition Elements on the Fabrication of TiC-Ti3SiC2 Composites by Spark Sintering

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materials Transactions 2025年第5期66卷 608-615页

作者： Qu, Jing Matsugi, Kazuhiro Choi, Yongbum Xu, Zhefeng Yu, Jinku Department of Mechanical Materials Engineering Hiroshima University Higashihiroshima739-8527 Japan State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

In TiC-Ti3SiC2 composites, the introduction of the TiC hard phase could improve the hardness of the Ti3SiC2 phase and prepare high hardness, high toughness and self-lubricating materials. In this study, elementary Ti, Si and graphite powders in the molar ratio of 3:1+x:2 were used as starting powders, a small amount of Al powder was added as a sintering aid, and spark sintering technology was used to sinter in the temperature range of 1373 to 1673 K at 50 MPa in vacuum. The reacted phases were identified by X-ray diffraction, and microstructure characteristics were observed. The formation mechanism of TiC-Ti3SiC2 composites was investigated based on the sintering behavior of the elemental powders during spark sintering. Pure TiC-Ti3SiC2 composites could be prepared from Ti, Si, graphite powders and Al at a molar ratio of 3:1.1:2:0.3 at 1573 K with a holding time of 0.9 ks. In conclusion, dual phase consist of TiC and Ti3SiC2 composite could be synthesized through in-situ reaction by adjusting process parameters such as sintering temperature, holding time and the content of Si and Al in element blending method. [doi:10.2320/***-MC2024008] ©2025 The Japan Institute of Metals and materials.

关键词： Titanium carbide

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Insights into the effect of Y substitution on superlattice structure and electrochemical performance of A5B19-type La-Mg-Ni-based hydrogen storage alloy for nickel metal hydride battery

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材料科学技术（英文版） 2025年第4期207卷 60-69页

作者： Yanan Guo Wenfeng Wang Huanhuan Su Hang Lu Yuan Li Qiuming Peng Shumin Han Lu Zhang College of Environmental and Chemical Engineering Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China College of Environmental and Chemical Engineering Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Baotou Zhongke Xuanda New Energy Technology Co.Ltd. Baotou 014030China

La-Mg-Ni-based hydrogen storage alloys with superlattice structures are the new generation anode mate-rial for nickel metal hydride(Ni-MH)batteries owing to the advantages of high capacity and exceptional activation ***,the cycling stability is not currently satisfactory enough which plagues its ***,a strategy of partially substituting La with the Y element is proposed to boost the capacity durability of La-Mg-Ni-based ***,phase structure regulation is implemented simultaneously to obtain the A5B19-type alloy with good crystal stability *** is found that Y promotes the phase formation of the Pr5Co19-type phase after annealing at 985 ℃.The alloy containing Y contributes to the superior rate capability resulting from the promoted hydrogen diffusion ***,Y substitution enables strengthening the anti-pulverization ability of the alloy in terms of increasing the volume match between[A2B4]and[AB5]subunits,and effectively enhances the anti-corrosion ability of the alloy due to high electronegativity,realizing improved long-term cycling stability of the alloy from 74.2％to 78.5％after cycling 300 *** work is expected to shed light on the composition and structure design of the La-Mg-Ni-based hydrogen storage alloy for Ni-MH batteries.

关键词： Nickel metal hydride battery Y element La-Mg-Ni-based alloy A5B19-type superlattice structure Electrochemical performance

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Characterization of the interfacial structure and fracture behavior of in situ synthesized ceramics to reinforce Ni-based composite coatings

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材料科学技术（英文版） 2025年第5期208卷 11-25页

作者： Yuxin Wang Yanchun Dong Yun Tian Jianing Liu Dongyao Zhang Chunli Qiu Yanqi Zhao Yong Yang School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300132China

This work used the in-situ synthesis of molten-state nitride ceramic phase-reinforced Ni-based alloy coat-ings,aiming to improve the phase-interface bonding through the interdependent co-solidification be-tween molten *** XRD was used to analyze the physical phases of the composite *** microstructure and phase-interface structure were characterized in detail by combining SEM,TEM,HRTEM,FFT,and SAED *** tester and microforce microhardness tester were em-ployed to measure the surface hardness and elastic modulus of the composite *** fracture be-havior of the composite coatings was characterized by observing the fracture morphology of the coatings using SEM combined with the EDS *** was found that the formation mechanisms of inter-facial misfit dislocation assistance,lattice distortion,aggregation of stacking faults,and specific growth orientation between the y-Ni matrix phase and each ceramic phase in NiCrBSi-TiCrN composite coat-ings improved the lattice matching between the two-phase interface,which resulted in the formation of atomically corresponding coherent lattice relations and stepped interfacial semi-coherent lattice relations,and enhanced the degree of phase-interface *** this basis,the composite coatings with high Cr content further inhibited the expansion of interphase penetration cracks due to the existence of Cr-rich zones at the phase interface,thus exhibiting high fracture *** work provides new opinions on the improvement of phase-interface bonding and composition design of Ni-based composite coatings.

关键词： In situ synthesis NiCrBSi-TiCrN composite coating Phase interface Fracture behavior

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Modulating the Switching Performance of Fulgimide-Based Molecular Junctions through Atomic Substituents

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Journal of Physical Chemistry C 2025年第19期129卷 9114-9119页

作者： Fang, Zhihang Liu, Yang Ma, Ziwei Tian, Guangjun Ma, Liang State Key Laboratory of Metastable Materials Science & Technology Key Laboratory for Microstructural Material Physics of Hebei Province School of Science Yanshan University Qinhuangdao066004 China

The development of molecular switches with high stability and performance continues to be a focal point in the field of molecular electronics. Among these, fulgimide, a representative photochromic molecule, holds significant promise as a photoswitch due to its capability to undergo reversible conformational changes. In this study, the nonequilibrium Green’s function (NEGF) method, combined with density functional theory (DFT), is employed to investigate the transport properties of fulgimide-based molecular junctions derived from the furan (O), thiophene (S), and indole (N) classes. key calculations, including current-voltage (I-V) characteristics, transmission spectra, and switching ratios, demonstrate that fulgimide-based molecular junctions exhibit pronounced switching behavior and negative differential resistance effects. The observed switching ratio (O > S > N) suggests that modifying the central molecular unit enables effective tuning of the junction’s properties. Furthermore, detailed analyses using the molecular projected self-consistent Hamiltonian (MPSH) and real-space eigenchannels provide valuable insights into the underlying mechanisms driving the observed transport phenomena. © 2025 American Chemical Society.

关键词： Density functional theory

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