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Preparation and magnetic hardening of low Ti content(Sm,Zr)(Fe,Co,Ti)_(12) magnets by rapid solidification non-equilibrium method

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Chinese Physics B 2024年第9期33卷 576-580页

作者： Xing-Feng Zhang Li-Bin Liu Yu-Qing Li Dong-Tao Zhang Wei-Qiang Liu Ming Yue College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China

The Sm–Zr–Fe–Co–Ti quinary-alloys with ThMn12 structure has attracted wide attention for ultra-high intrinsic magnetic properties,showing potentiality to be developed into rare-earth permanent *** Ti element in alloys is crucial for phase stability and magnetic properties,and lower Ti content can increase intrinsic magnetic properties but reduce phase *** this study,the 1:12 single-phase melt-spun ribbons with low Ti content was successfully prepared using a rapid solidification non-equilibrium method for the Sm1.1Zr_(0.2)Fe_(9.2)Co_(2.3)Ti_(0.5) ***,this non-equilibrium ribbon did not achieve good magnetic hardening due to the uneven microstructure and ***,annealing was carried out to eliminate micro-strain and homogenize microstructure,therefore,remanence and coercivity were significantly improved even the precipitation of a small amount of a-Fe phase which were not conducive to *** remanence of 86.1 emu/g and coercivity of 151 kA/m was achieved when annealing at 850℃ for 45 *** hot pressing,under the action of high temperature and pressure,a small portion of ThMn12 phases in the magnet decompose into Sm-rich phases and a-Fe,while remanence of 4.02 kGs(1 Gs=10^(-4) T),and coercivity of 1.12 kOe(1 Oe=79.5775 A·m^(-1))were still *** findings can provide reference for exploring practical permanent magnets made of 1:12 type quinary-alloys.

关键词： magnetic materials (Sm Zr)(Fe Co Ti)_(12) magnets nanocrystalline magnet microstructure

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A hierarchical NiFeOOH@CeO_(2−x)nanosheets array boosts electrocatalytic activity and durability at high current densities for water oxidation

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Nano Research 2025年第3期18卷 204-214页

作者： Wei Zhang Liyang Xiao Xiaorui Huang Chunyan Han Ying Liu Jingtong Zhang Haiwen Tan Rui Zhang Pengfei Yin Cunku Dong Hui Liu Xiwen Du Jing Yang Institute of New Energy Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The oxygen evolution reaction(OER)reaction kinetics of nickel-iron(oxy)hydroxides(NiFeOOH)is limited by their weak adsorption of OER ***,a hierarchical NiFeOOH@CeO_(2−x)nanosheets array was in situ grown on a nickel foam by a facile laser direct writing method,which exhibits superior OER activity and durability at high current densities in alkaline *** hierarchical nanosheets array exposes abundant catalytic active sites,which greatly promote OER reaction *** strong electronic interaction at the NiFeOOH/CeO_(2−x)interface leads to favorable electron transfer from Ni^(2+)/^(3+)and Fe^(3+)to Ce^(3+)/^(4+).The Ni sites with high valences show enhanced OH−adsorption and also promote the formation of*OOH intermediate,thereby greatly improving OER intrinsic *** oxygen deficient CeO_(2−x)primary sheets guarantee good electrical *** a well-designed catalytic electrode requires overpotentials of only 229 and 287 mV to achieve current densities of 50 and 500 mA·cm^(−2),respectively,and sustains superior stability at 500 mA·cm^(−2)and 1 A·cm^(−2).

关键词： hierarchical nanosheets transition metal(oxy)hydroxides oxygen evolution reaction laser direct writing water splitting

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Microstructure and Mechanical Properties of Al_(2)O_(3p)/AZ91 Magnesium Matrix Laminated Material Adjusted by Freezing Temperature

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1819-1829页

作者： Ze-Xin Bai Kun-Kun Deng Ze-Qi Du Kai-Bo Nie Chao Xu Quan-Xin Shi Shanxi Key Laboratory of Advanced Magnesium-based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The Al_(2)O_(3)laminated preforms with different layers thickness were prepared by freezing casting in present ***,the Al_(2)O_(3p)/AZ91 magnesium matrix laminated materials were obtained by infiltrating the AZ91 alloy melt into the Al_(2)O_(3)laminated preform based on pressure infiltration ***,the influence of freezing temperature on the microstructure,mechanical properties and fracture behavior of magnesium-based laminates was *** results indicated that with the decrease of freezing temperature,the thickness of Al_(2)O_(3)layers decreases gradually,the number of layers increases obviously,and the interlayers spacing *** with the decrease of interlayers spacing,the size of Mg17Al12 phase precipitated in the AZ91 alloy layers was refined,and the compression strength and strain were both improved *** micro-cracks initiated in Al_(2)O_(3)layers during loading process,while the AZ91 layers could effectively suppress the initiation and propagation of ***,the changing layers structure influenced by the decrease of freezing temperature had significant inhibiting effect on the initiation and propagation of micro-cracks,which endowed the Al_(2)O_(3p)/AZ91 magnesium matrix laminated materials with better strength and ***,the best compression properties of Al_(2)O_(3p)/AZ91 magnesium matrix laminated materials could be obtained at the freezing temperature of−50℃,the compression strength and elastic modulus of which were the 160%and 250%of monolithic AZ91 alloy,respectively.

关键词： Bio-inspired composites Freeze-casting Mechanical properties Metal matrix composites

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Redox Couple Modulation in NASICON Phosphates toward High-Performance Cathodes for Na-Ion Batteries

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Energy Material Advances 2024年第1期5卷 570-586页

作者： Dashan Fan Qiuyu Shen Han Li Xuanhui Qu Lifang Jiao Yongchang Liu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Natrium superionic conductor(NASICON)-type phosphates have aroused a great interest as cathode materials for sodium-ion batteries(SIBs)by virtue of their stable 3-dimensional frameworks,flexible molecular formula tunability,and superior ionic ***,the intrinsic low electronic conductivity and relatively low theoretical specific capacity place obstacles in their way toward achieving higher electrochemical *** addition,only 2-electron reactions in most NASICON cathodes and poor reversibility of high-voltage redox couples severely limit their energy *** address the above tough issues,an in-depth understanding of transition metal selection,elements ratio optimization,and Na-storage mechanism is of paramount ***,this mini review summarizes the latest progresses on the NASICON-type phosphate cathodes for SIBs from the perspective of redox couple *** cathodes featuring high operating voltage and multielectron reactions are discussed in ***,the remaining challenges and personal outlooks based on redox couple regulation are put forward,shedding light on the designing rules for high-energy and long-durability NASICON-type phosphate cathodes for SIBs in the future.

关键词： theoretical specific capacity ionic conductivityneverthelessthe cathode materials electronic conductivity high performance cathodes redox couple modulation sodium ion batteries electrochemical performance

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Real-time fluorescent detection of food spoilage with doped quantum dots-anchored hydrogel sensor

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Nano Research 2024年第12期17卷 10467-10475页

作者： Chenying Li Jianzhong Li Lei Ji Yibin Zhu Jiajia Liu Jiatao Zhang School of Materials Science and Engineering Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsBeijing Institute of TechnologyBeijing 100081China School of Chemistry and Chemical Engineering MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical EngineeringMOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

Spermine assumes a pivotal role in assessing food safety due to its potential to induce a spectrum of diseases upon excessive ***,contemporary spermine detection methodologies,exemplified by high-performance liquid chromatography(HPLC),demand costly instrumentation and the expertise of skilled *** address this challenge,the study introduces a portable fluorescence sensing *** fluorescent probes were realized through the utilization of CdS quantum dots deeply doped with Ag^(+)(CdS:Ag QDs)and nitrogen-doped carbon quantum dots(N-CQDs).Hydrogen bonds formed between CdS:Ag QDs and spermine result in the formation of the assembly and the decreasing of the fluorescence *** an effort to broaden the applicative scope and streamline deployment processes,fluorescent sensing hydrogels were meticulously engineered,capitalizing on the swelling properties inherent in polyvinyl alcohol(PVA)*** systematic delineation of the correlation between 1-R/B and spermine concentration facilitates the quantitative determination of spermine *** incorporation of this composite construct serves to alleviate environmental influences on the probes,thereby augmenting their *** portable fluorescent sensing platform proves pivotal in expeditiously measuring spermine concentration within the fluorescent sensing hydrogel,enabling a quantitative assessment of pork *** utilization of this platform for food freshness evaluation imparts the benefits of convenience,cost-effectiveness,and intuitive operation.

关键词： Ag^(+)doped CdS quantum dots nitrogen-doped carbon quantum dots ratiometric fluorescent sensing hydrogel portable platform spermine detection

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An epitaxial surface heterostructure anchoring approach for high-performance Ni-rich layered cathodes

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Journal of Energy Chemistry 2025年第6期105卷 158-169页

作者： Weili Sun Qingqing Zhang Xiao-Guang Sun Cheng Li Yongsheng Huang Wenyu Mu Junbin Tan Jianlin Li Kai Liu Shijian Zheng Sheng Dai Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and Engineering Hebei University of Technology Chemical Sciences Division Oak Ridge National Laboratory Neutron Scattering Division Oak Ridge National Laboratory Applied Materials Division Argonne National Laboratory School of Materials Science and Engineering Tianjin University of Technology Department of Chemistry University of Tennessee

Nickel-rich（Ni≥90%） layered oxides materials have emerged as a promising candidate for nextgeneration high-energy-density lithium-ion batteries（LIBs）.However,their widespread application is hindered by structural fatigue and lattice oxygen *** this work,an epitaxial surface rock-salt nanolayer is successfully developed on the LiNi0.9Co0.1O2sub-surface via heteroatom anchoring utilizing high-valence element molybdenum *** in-situ formed conformal buffer phase with a thickness of 1.2 nm effectively suppresses the continuous interphase side-reactions,and thus maintains the excellent structure integrity at high ***,theoretical calculations indicate that the lattice oxygen reversibility in the anion framework of the optimized sample is obviously enhanced due to the higher content of O 2p states near the Fermi level than that of the pristine ***,the stronger Mo-O bond further reduces cell volume alteration,which improves the bulk structure stability of modified ***,the detailed charge compensation mechanism suggests that the average oxidation state of Ni is reduced,which induces more active Li+participating in the redox reactions,boosting the cell energy *** a result,the uniquely designed cathode materials exhibit an extraordinary discharge capacity of 245.4 mAh g-1at 0.1 C,remarkable rate performance of 169.3 mAh g-1at 10 C at4.5 V,and a high capacity retention of 70.5% after 1000 cycles in full cells at a high cut-off voltage of 4.4 *** strategy provides an valuable insight into constructing distinctive heterostructure on highperformance Ni-rich layered cathodes for LIBs.

关键词： Heteroatom anchoring Lattice oxygen reversibility Lithium-ion batteries Ni-rich layered oxides Rock-salt nanolayer

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Electronic structural engineering of bimetallic Bi-Cu alloying nanosheet for highly-efficient CO_(2) electroreduction and Zn-CO_(2) batteries

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Nano Research 2024年第5期17卷 3684-3692页

作者： Wenbo Wu Jiaye Zhu Yun Tong Shuangfei Xiang Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface and Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China

Regulating the electronic structure of Bi-based materials by alloying engineering is promising to promote the electrocatalytic activity,but it remains some challenges to be *** this study,a facile electrochemical co-deposition strategy is developed to synthesize the bimetallic Bi_(9)Cu_(1) alloy nanosheet on carbon cloth(Bi_(9)Cu_(1)/CC),which represents a novel self-supporting electrode for the electrocatalytic carbon dioxide(CO_(2))reduction reaction(CO_(2)RR).The Bi_(9)Cu_(1)/CC catalyst has achieved a remarkable catalytic performance with high Faradaic efficiencies(FE)of over 90%for formate at wide potentials from-0.7 to-1.2 V *** hydrogen electrode(RHE).Moreover,the reversible Zn-CO_(2) battery can be driven by Bi_(9)Cu_(1)/CC cathode with a largest power density of 1.4 mW·cm^(-2),and superior operating *** systematic characterizations and electrochemical results confirm that the improved catalytic active sites,the enhanced mass/charge transport and the optimal reaction kinetics of Bi nanosheet are realized for CO_(2)RR by Cu *** situ attenuated total reflection infrared(ATR-IR)result confirms the bimetallic Bi-Cu active sites prefer to follow the^(*)OCHO conversion *** density functional theory(DFT)calculations suggest that the Cu alloying contributes to the increased density of states near the Fermi surface of Bi and the optimized adsorption of^(*)OCHO intermediates on the Bi sites,resulting in the excellent catalytic performance.

关键词： electronic regulation bismuth nanosheet copper alloying CO_(2)electroreduction Zn-CO_(2)batteries

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High photoluminescence Ag-In-Ga-S quantum dots based on ZnX_(2)-treated surface passivation

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Nano Research 2024年第8期17卷 7533-7541页

作者： Danni Yan Yuhui Dong Naiwei Wei Shuai Yang Hong Zhu Wanzhong Gu Yousheng Zou Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

Quaternary Ag-In-Ga-S(AIGS)quantum dot(QD)is considered a promising,spectral-tunable,and environmentally friendly luminescent display ***,the more complex surface defect states of AIGS QDs resulting from the coexistence of multiple elements lead to a low(<60%)photoluminescence quantum yield(PLQY).Here,we develop a novel convenient method to introduce Z-type ligands ZnX_(2)(X=Cl,Br,I)for passivating the surface defects of AIGS QDs to dramatically enhance the PLQY and stability without affecting the crystalline structure and *** show that the addition of ZnCl_(2) during the purified process of AIGS QDs leads to a 3-fold increase of PLQY(from 28.5% to 87%).Impressively,the highest PLQY is up to a recorded value of 92%,which is comparable to typical heavy metal *** dynamics studies have shown that the rapid annihilation process of excitons in treated QDs is *** also confirm that the improvement in PLQY is a result of the effective passivation of the non-coordinating atom on the QD surface by building a new bonding between sulfur dangling and Zn2+.The realization of high PLQY will further promote the application of AIGS QDs in luminescent displays.

关键词： I-III-VI quantum dots Ag-In-Ga-S surface defect passivation Z-type ligand photoluminescence quantum yield

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An unexpected vortex field by twist

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science China materials 2025年第5期68卷 1680-1681页

作者： Yunhao Lu School of Physics Zhejiang University State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science & EngineeringZhejiang University

Due to their reduced dimensionality and strong quantum confinement, two-dimensional (2D) materials have emerged as a versatile platform for exploring quantum phenomena absent in their bulk counterparts. Stacking 2D materials to form bilayer heterostructures or homostructures introduces additional degrees of freedom to tune or even create novel quantum properties [1].

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Flexible electrochemical fiber sensor for intracranial nitric oxide monitoring

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science China Chemistry 2024年第8期67卷 2431-2433页

作者： Ziwei Liu Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceInstitute of Fiber Materials and Devicesand Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China

Real-time and accurate monitoring of vital biomarkers in vivo forms a crucial foundation for health assessment,early intervention,and disease ***,continuous monitoring of intracranial nitric oxide(NO)levels plays a pivotal role in promptly assessing immune responses,neurovirulence,and cerebrovascular diseases[1].Differing from non-real-time monitoring methods like chemiluminescence[2]and fluorescent probes[3],implantable electrochemical sensors excel in simultaneously high temporal resolution,sensitivity,and cost-effectiveness[4].

关键词： prompt electrochemical monitoring

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