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Excellent soft magnetic Fe-based nanocrystalline bulk toroidal cores via one-step low-heating-rate annealing

science China(Physics,Mechanics & Astronomy) 2025年第7期Mechanics & Astronomy) .卷 160-167页

作者： Yanan Chen Xing Tong Yuanfei Cai Yaocen Wang Meng Gao Haibo Ke Guangqiang Zhang Haiyang Bai Weihua Wang Juntao Huo Jun-Qiang Wang Yan Zhang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Songshan Lake Materials Laboratory School of Physical Science and Technology Northwestern Polytechnical University Jiangsu JITRI Advanced Energy Materials Research Institute Co. Ltd Institute of Physics Chinese Academy of Sciences

Soft magnetic materials are critical for bulk/large cores in transformers and motors,and yet achieving uniform properties in industrial-scale devices remains *** study develops a one-step,low heating rate annealing process to achieve uniform fine α-Fe nanocrystallization（grain size <20 nm） across the entire volume of Fe81.5Si0.5B4.5P11Cu0.5C2bulk toroidal *** proposed process effectively eliminates microstructural heterogeneity induced by crystallization dynamics and temperature *** the same time,it achieves a high magnetic flux density(B80) of～169 emu/g,low coercivity of～5.4 A/m,and low core loss of W1.0/50=0.12 W/kg and W1.5/50=0.31 W/*** permeability remains constant at a value greater than 4.5×10～3 up to a frequency of 4×10～4 *** research provides a scalable solution for the industrial-scale production of high-performance nanocrystalline magnetic cores,advancing the development of next-generation power electronic devices.

关键词： one-step annealing low heating rate nanocrystalline bulk toroidal core low core loss

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Bimagnetic metal constructed core-shell structure of Fe@Co nanowires for multi-band microwave absorption

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Progress in Natural science:materials International 2024年第2期34卷 354-361页

作者： Ping-an Yang Rui Cai Haibo Ruan Nanqing Zhang Xin Huang Rui Li Yuxin Zhang Yi Lu Zhihao Zhou School of Automation Chongqing University of Posts and Telecommunications Chongqing Key Laboratory of Materials Surface & Interface Science Chongqing University of Arts and Sciences College of Engineering and Technology Zunyi Normal College College of Material Science and Engineering Chongqing University

Controlled fabrication of materials by surface modification techniques has been a hot research topic. In this paper,one-dimensional(1D) core-shell structure Fe@Co nanowires(NWs) were successfully prepared by anchoring 0-dimensional(0D) Co nanoparticles on 1D Fe NWs based on the in situ reduction method. The electromagnetic parameters of the specimens at a filler mass fraction of 25 wt% were tested and the microwave loss mechanism was deeply analyzed. Binary magnetic metals in a core-shell structure have excellent multi-band microwave absorption capability(S-band, X-band and Ku-band). This is due to the heterogeneous interface and magnetic coupling effects tuning the dielectric and magnetic loss. This study offers a workable plan for creating effective multi-band magnetic metal-based microwave absorbers.

关键词： Microwave absorption One-dimensional nanowires Core-shell structure Magnetic coupling interface

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Zeolites for the separation of ethylene,ethane,and ethyne

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Frontiers of Chemical science and engineering 2024年第9期18卷 137-146页

作者： Binyu Wang Qiang Li Haoyang Zhang Jia-Nan Zhang Qinhe Pan Wenfu Yan State Key Laboratory of Inorganic Synthesis&Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Key Laboratory of Advanced Energy Catalytic and Functional Materials Preparation College of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450012China Key Laboratory of Advanced Materials of Tropical Island Resources(Ministry of Education) School of Chemistry and Chemical EngineeringHainan UniversityHaikou 570228China

The cost-effective separation of ethylene(C_(2)H_(4)),ethyne(C_(2)H_(2)),and ethane(C_(2)H_(6))poses a significant challenge in the contemporary chemical *** contrast to the energy-intensive high-pressure cryogenic distillation process,zeolite-based adsorptive separation offers a low-energy *** review provides a concise overview of recent advancements in the adsorptive separation of C_(2)H_(4),C_(2)H_(2),and C_(2)H_(6)using zeolites or zeolite-based *** commences with an examination of the industrial significance of these compounds and the associated separation ***,it systematically examines the utilization of various types of zeolites with diverse cationic species in such separation *** then it explores how different zeolitic structures impact adsorption and separation capabilities,considering principles such as cation-πinteraction,π-complexation,and steric separation concerning C_(2)H_(4),C_(2)H_(2),and C_(2)H_(6)***,it discusses methods to enhance the separation performance of zeolites and zeolite-based adsorbents,encompassing structural design,modifications,and ion exchange ***,it summarizes current research trends and future directions,highlighting the potential application value of zeolitic materials in the field of C_(2)H_(4),C_(2)H_(2),and C_(2)H_(6)separation and offering recommendations for further investigation.

关键词： zeolite ethylene ethane cation-πinteraction π-complexation

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Preparation and properties of chitosan-VC loaded nano-silver-doped natural latex

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Progress in Natural science:materials International 2022年第5期32卷 625-633页

作者： Liangzhi Jia Liqiao Wei Yanhong Zhang Hua Wang Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education College of Materials Science and Engineering Taiyuan University of Technology China Development Strategy Institute for Building Materials Industry College of Textile Engineering Taiyuan University of Technology

As one kind of the modern medical devices, various catheters are commonly used in interventional therapy, but they are prone to infection in the human body, which is a defect in clinical treatment. At present, the commonly used catheters are mostly treated with antibacterial coatings on the rubber catheters. However, there are some problems for their application, such as, easy peeling of the coating and poor durability of antibacterial *** order to solve the above problems, a kind of nano-silver antibacterial agent reduced and stabilized by Vitamin C modified chitosan was prepared, and then added into natural latex to produce an antibacterial latex with antibacterial properties from the inside to the outside. The chemical properties, mechanical properties and antibacterial properties of the samples were characterized, and the antibacterial mechanism of VC modified chitosan/nano silver was analyzed. The results showed that the antibacterial rates of the latex samples against E. coli and S. aureus reached 97.38% and 98.45%.

关键词： Chitosan Nano silver Antibacterial Natural latex

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Encapsulating perovskite quantum dots into 3D COF for visible light-driven CO_(2) reduction

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science China Chemistry 2025年第4期68卷 1478-1485页

作者： Xinxin Wang Yucheng Jin Xiya Yang Qingyu Luan Tianyu Wang Dongdong Qi Kang Wang Jianzhuang Jiang College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Lead halide perovskite quantum dots(LHP QDs)have been revealed to possess great potential in photocatalytic applications including CO_(2)reduction;which however suffer from poor ***;a high crystalline hydrazine-linked three-dimensional(3D)covalent organic framework;USTB-17;was fabricated from the reaction between 12-connected building block and 4-connected 3,5,7-tetrakis(4-aldophenyl)-***-modification with Ni^(2+) affords the metallic framework USTB-17(Ni)followed by sequential deposition of the CH_(3)NH_(2)PbI_(3)(MAPbI_(3))perovskite QDs into its pores;generating the USTB-17(Ni)@MAPbI_(3) *** X-ray diffraction analysis together with theoretical simulations and transmission electron microscopy discloses the crystalline nature of USTB-17;USTB-17(Ni);and USTB-17(Ni)@MAPbI_(3) with an unprecedented noninterpenetrated hpt *** close contact of QDs inside the COF pores with the Ni catalytic site locating at the pore surface of COF allows a rapid transfer of the photogenerated electrons in QDs to the Ni catalytic sites;enhancing the photocatalytic activity for CO_(2)*** endows USTB-17(Ni)@MAPbI_(3) with efficient photocatalysis performance for photocatalytic CO_(2)reduction with CO generation rate of 365μmol g^(-1)h^(-1)and CO selectivity up to 96%under visible-light irradiation;7 times higher than that of USTB-17(Ni).After four cycles of reactions;the photocatalytic CO generation rate remains almost unchanged;demonstrating its excellent cycle stability.

关键词： lead halide perovskite quantum dots 3D covalent organic frameworks hpt topology photocatalytic CO_(2)reduction

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Regulating photocatalytic overall water splitting of ferroelectric heterostructures by size effect

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Nano Research 2024年第9期17卷 8000-8006页

作者： Zixing Ye Daifu Yu Ruian Zhang Fei Qin Yiran Sun Jie Huang Zhanqi Zhou He Tian Gaorong Han Zhaohui Ren Gang Liu State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Center of Electron Microscopy School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

In the past decade,ferroelectric materials have been intensively explored as promising *** intriguing ability of ferroelectrics is to directly sperate the photogenerated electrons and holes,which is believed to arise from a spontaneous *** how polarization affects the photocatalytic performance is vital to design high-efficiency *** this work,we report a size effect of ferroelectric polarization on regulating the photocatalytic overall water splitting of SrTiO_(3)/PbTiO_(3)nanoplate heterostructures for the first *** was realized hydrothermally by controlling the thickness and thus spontaneous polarization strength of single-crystal and single-domain PbTiO_(3)nanoplates,which served as the substrate for selective heteroepitaxial growth of SrTiO_(3).An enhancement of 22 times in the photocatalytic overall water splitting performance of the heterostructures has been achieved when the average thickness of the nanoplate increases from 30 to 107 nm.A combined experimental investigation revealed that the incompletely compensated depolarization filed is the dominated driving force for the photogenerated carrier separation within heterostructures,and its increase with the thickness of the nanoplates accounts for the enhancement of photocatalytic ***,the concentration of oxygen vacancies for negative polarization compensation has been found to grow as the thickness of the nanoplates increases,which promotes oxygen evolution reaction and reduces the stoichiometric ratio of H_(2)/O_(2).These findings may provide the opportunity to design and develop high-efficiency ferroelectric photocatalysts.

关键词： single-domain nanoplates size effect ferroelectric polarization screening photocatalytic overall water splitting

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f-p-d coupling-induced bonding covalency boosts C–C coupling in electrocatalytic CO2 reduction over Er–O–Cu sites

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Journal of Energy Chemistry 2025年 108卷 239-245页

作者： Wang, Maoyin Huang, Yuhang Song, Lu Wei, Ruilin Hao, Shuya Liu, Zhengzheng Hu, Cejun Li, Bin Lv, Ximeng Yuan, Pei Zheng, Gengfeng Laboratory of Advanced Materials State Key Laboratory of Porous Materials for Separation and Conversion Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai Shanghai200438 China School of Materials Science and Engineering Fuzhou University Fujian Fuzhou350108 China College of Materials Science and Engineering Qingdao University of Science and Technology Shandong Qingdao266042 China

The copper-based electrocatalysts feature attractive potentials of converting CO2 into multi-carbon (C2+) products, while the instability of Cu–O often induces the reduction of Cu+/Cu0 catalytic sites at the cathode and refrains the capability of stable electrolysis especially at high powers. In this work, we developed an Erbium (Er) oxide-modified Cu (Er–O–Cu) catalyst with enhanced covalency of Cu–O and more stable active sites. The f-p-d coupling strengthens the covalency of Cu–O, and the stability of Cu+ sites under electroreduction condition is critical for promoting the C–C coupling and improving the C2+ product selectivity. As a result, the Er–O–Cu sites exhibited a high Faradaic efficiency of C2+ products (FEC2+) of 86 % at 2200 mA cm−2, and a peak partial current density of |jC2+| of 1900 mA cm−2, comparable to the best reported values for the CO2-to-C2+ electroreduction. The CO2 electrolysis by the Er–O–Cu sites was further scaled up to 100 cm2 to achieve high-power (∼200 W) electrolysis with ethylene production rate of 16 mL min−1. © 2025 science Press and Dalian Institute of Chemical Physics, Chinese Academy of sciences

关键词： Electrolytic reduction

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Nanofiber-based polymer electrolyte membranes for fuel cells

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Carbon Energy 2025年第4期7卷 1-35页

作者： Ning Liu Shuguang Bi Yi Zhang Ying Ou Chunli Gong Jianhua Ran Yihuang Chen Yingkui Yang State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhanChina School of Chemistry and Materials Science Hubei Engineering UniversityXiaoganChina College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouChina

Developing low-cost and high-performance nanofiber-based polyelectrolyte membranes for fuel cell applications is a promising solution to energy *** to the high specific surface area and one-dimensional longrange continuous structure of the nanofiber,ion-charged groups can be induced to form long-range continuous ion transfer channels in the nanofiber composite membrane,significantly increasing the ion conductivity of the *** review stands apart from previous endeavors by offering a comprehensive overview of the strategies employed over the past decade in utilizing both electrospun and natural nanofibers as key components of proton exchange membranes and anion exchange membranes for fuel *** nanofibers are categorized based on their material properties into two primary groups:(1)ionomer nanofibers,inherently endowed with the ability to conduct H+(such as perfluorosulfonic acid or sulfonated poly(ether ether ketone))or OH-(e.g.,FAA-3),and(2)nonionic polymer nanofibers,comprising inert polymers like polyvinylidene difluoride,polytetrafluoroethylene,and ***,the latter often necessitates surface modifications to impart ion transport channels,given their inherent proton ***,this review delves into the recent progress made with three natural nanofibers derived from biodegradable cellulose—cellulose nanocrystals,cellulose nanofibers,and bacterial nanofibers—as crucial elements in polyelectrolyte *** effect of the physical structure of such nanofibers on polyelectrolyte membrane properties is also briefly ***,the review emphasizes the challenges and outlines potential solutions for future research in the field of nanofiber-based polyelectrolyte membranes,aiming to propel the development of high-performance polymer electrolyte fuel cells.

关键词： anion exchange membranes fuel cells nanofibers proton exchange membranes

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Polymorphic signal responses of phase-change quantum dot string upon stochastic resonance

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Nano Research 2025年第2期18卷 717-724页

作者： Qin Wan Fei Zeng Ziao Lu Junwei Yu Feng Pan Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Center for Brain Inspired Computing Research(CBICR) Tsinghua UniversityBeijing 100084China

We successfully constructed phase-change quantum dots string(PCQDS)systems and studied their signal *** PCQDs actually is a cascaded structure consisted of several stochastic resonance(SR)two-state systems,in which inherent non-linearity,i.e.,phase-change of quantum dots(QDs),plays elementary and important roles to modulate signal *** established an SR model to simulate signal responses depending on stimulation *** know that some QDs will oscillate with input forcing frequency,while certain QDs will oscillate in their own frequency triggered by phase *** two effectscooperate togeneratepolymorphic response patterns,including action potential patterns exhibited by envelope of spike peak *** interesting and important simulation is that we replicate the memory effect in Nb-doped AINO,i.e.,a QDs dispersed *** result indicates that memory can occur in a system only constructed by volatile elementary units,implying memory existing in ***-term plasticity and spike-rate dependent plasticity can also be realized by using frequency and phase *** study provides a new scope to study signal handling and memory effect in quantum system.

关键词： quantum-dot string phase-change inherent nonlinearity signal modulation niobium oxide stochastic resonance

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Regulating the microenvironment of catalytic sites by atomically precise and charge tunable Au25 nanoclusters for efficient 5-hydroxymethylfurfural electro-oxidation

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science China Chemistry 2025年第6期68卷 2407-2414页

作者： Zhijuan Liu Sha-Sha Cui Lu-Yu Liu Fen Wang Guangjin Wang Zhijie Kong Xiao-Fei Liu Xin Zhang Haisong Feng Ren-Wu Huang Shuangyin Wang Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials Green Catalysis Center and College of ChemistryZhengzhou University School of Materials Science and Energy Engineering Foshan University State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical Technology State Key Laboratory of Chem/Bio-sensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

Electrochemical biomass oxidation has garnered considerable attention due to its low energy consumption and the production of high-value chemicals. Supported metal nanoparticle catalysts have been widely explored in electrochemical 2,5-hydroxymethylfurfural oxidation reaction（HMFOR） but limited by their inhomogeneity to build a clear structure-ability relationship at atomic level. Atomically precise metal nanoclusters with well-defined composition, high purity and unique physichemical property are one kind of ideal model electrocatalyst. In this work, we regulate the microenvironment of catalytic sites in Ni Se2utilizing atomically precise and charge tunnable Au25nanoclusters. The electrochemical results reveal that after the modification of Au25nanoclusters, the HMFOR ability of NiSe2could be enhanced. Among them, the NiSe2modified with Au25-clusters displayed the best electrocatalytic ability, in which the electrons were preferred to transfer from Au25-to NiSe2substrate resulting in the electrons accumulation at the electrocatalyst surface. The enhanced electrochemical performance of electrocatalyst can be attributed to two key factors:（1） enhanced adsorption ability towards HMF due to the strong interaction between electron enriched surface and electrophilic furan rings;（2） fast electron transfer at Au25-/NiSe2interface, resulting in the rapid structure evolution to form active Ni OOH sites. This study serves as a valuable reference for designing highly efficient, atomically precise metal nanocluster electrocatalysts for biomass upgrading.

关键词： microenvironment regulation interfacial electron transfer NiOOH species enhanced adsorption ability 2 5-hydroxymethylfurfural electro-oxidation

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