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Preparation of high-rate anode materials based on porous highly conductive carbon coating and SiOx disproportionation reaction

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Progress in Natural science:materials International 2024年第4期34卷 739-746页

作者： Haihui Liu Qiang Xu Xiao Zhang Shuliang Lv Chang Ma State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Advanced Fibers and Energy Storage School of Materials Science and Engineering Tiangong University

Silicon monoxide（SiOx） has garnered considerable attention as an anode material owing to its high ***, its commercial viability is hampered by the low conductivity and inadequate cycling stability. In this study, a micrometer-scale silicon oxide/carbon composite（1000-SiOx/NC） was developed based on the porous and high electrical conductivity of pyrolyzed polydopamine（PDA） and the high-temperature disproportionation of SiOx. Electrochemical impedance spectroscopy（EIS） and X-ray photoelectron spectroscopy（XPS）analyses confirmed that the pyrolysis of polydopamine（PDA） not only improves electrode conductivity but also contributes to the formation of a stable solid electrolyte interface（SEI）. Additionally, SiOxundergoes disproportionation reactions during the pyrolysis of PDA, further the improves the cyclic stability of the ***, the 1000-SiOx/NC composite electrode exhibited an impressive specific capacity of 783.4 mAh·g-1after 500 cycles at 1 A g-1, maintaining 80.1 % of its initial capacity. Additionally, at a high rate of 3 C, its capacity reached 607.3 mAh·g-1The synthesis approach is both straightforward and economical, offering a fresh avenue for the widespread commercial deployment of SiOx.

关键词： Lithium-ion batteries Nitrogen doping 1000-SiO_x/NC anode Porous structure

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Co@C-N as an electronic mediator anchored with Cu2O nanoparticles enables efficient photoreduction of CO2 to CO with nearly 100% selectivity

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science China Chemistry 2025年第5期68卷 2160-2169页

作者： Xingbin Pan Xiuzheng Deng Jingshan Fan Jiangchuan Liu Changhai Liu Zhongyu Li Qian Liang Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou University School of Materials Science & Engineering Changzhou University

Solar-driven CO2conversion into value-added chemical provides an attractive strategy for sustainable ***,the enhanced CO2photoreduction performance with target product selectivity remains a major ***,we develop a novel strategy involving Cu2O nanoparticles in situ grown on the surface of ZIF-67-derived Co@C-N nanocages（CC） to create abundant active sites and appropriate heterointerfaces.A remarkable CO selectivity of 95.7% with a yield of 117.39 μmol g-1h-1and an apparent quantum efficiency as high as 1.88% at 420 nm was obtained over CC-60 catalyst in pure water,which was 87.6 times higher than that of pure *** calculations and experiments indicated that Co@C-N nanocages as charge mediator not only rapidly trap photogenerated electrons to promote charge separation efficiency,but also regulate the d-band center of Cu atoms to move to the Fermi energy level,thereby optimizing the reaction kinetics to facilitate the highly selective conversion of the key intermediate*CO desorption to CO.

关键词： Co nanocage electronic mediator interface regulation photocatalytic CO2 reduction high selectivity

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New strategy for efficient manufacturing of bulk anisotropic nanocrystalline Nd-Fe-B permanent magnets

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Journal of materials science & Technology 2024年第34期201卷 119-129页

作者： Qian Li Lingqi Liu Yuqing Li Ming Yue Yuan Teng Weiqiang Liu Dongtao Zhang School of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China

The application of bulk nanocrystalline Nd-Fe-B permanent magnets manufactured by hot deformation methods was severely limited by production ***,this work proposed an efficient prepa-ration method combining hot rolling and *** the melt-spun Nd-Fe-B magnetic powders as original materials,dense,large-sized,and well-uniform precursors for deformation can be obtained through cold pressing and hot *** large-sized hot-rolled magnet can be cut into small pieces and subjected to hot *** deformed magnet exhibits obvious crystallographic anisotropy,and the optimal maximum energy product can reach 35.7 ***,the mechanism of defor-mation and texture formation has been systematically studied,according to the microstructure and tex-ture characterization of different height reduction *** results indicated that there was a typical heterogeneous structure in the hot-rolled and hot-deformed Nd-Fe-B *** precipitation,grain growth,and regular grain arrangement were the main reasons for deformation and texture forma-tion during the deformation *** strategy of replacing traditional hot-pressing with large-sized hot-rolling can produce massively deformed precursors at once,greatly improving production efficiency,which is crucial for promoting the application of bulk nanocrystalline anisotropic Nd-Fe-B permanent magnets.

关键词： Anisotropic Nd-Fe-B magnet Hot rolling Hot deformation Deformation behavior Magnetic properties

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Plasticity dependence on amorphous continuity in Fe-SiOC dual-phase nanocomposites

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Journal of materials science & Technology 2024年第6期173卷 80-85页

作者： Weiming Li Lichen Bai Kaisheng Ming Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China

*** High strength and large deformability are greatly desirable for advanced structural metallic *** strengthening methods in crystalline materials rely on controlling the generation,propagation,and intersection of di... 详细信息

关键词： strengthening amorphous phase

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Research progress of carbon-based particle electrodes in three-dimensional electrode reactors for wastewater treatment

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新型炭材料(中英文) 2024年

作者： LU Hua-yu LIU Wei-feng QIN Lei LIU Xu-guang Institute of New Carbon Materials College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Ministry of Education Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering

Three-dimensional(3D) electrode technology is a competitive water treatment technology owing to its high catalytic efficiency, low energy consumption, and promising development. The introduction of a third electrode on the basis of a 2D electrode system forms a 3D electrode system, and the introduced third electrode is also known as the particle electrode. Particle electrodes in3D electrode system are generally in the form of particles or crumbs that be filled in between the cathode and anode. The core of the3D electrode system is the particle electrode, so the selection of particle electrode materials is the focus of the research of 3D electrode technology. Carbon-based materials are widely used as particle electrodes in 3D electrode technology because of their advantages of large specific surface area, good adsorption performance, high chemical stability, and low price. In this review, the research progress of carbon-based materials as particle electrodes for degrading organic pollutants in recent years is collected, the principle of3D electrode technology is introduced, along with the classification of particle electrodes and the current research status of carbonbased particle electrodes, and the challenges and future development of carbon-based particle electrodes in wastewater treatment are summarized.

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Atomic simulations of primary irradiation damage in U–Mo–Xe system

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Chinese Physics B 2023年第3期32卷 370-377页

作者：欧阳文泓刘剑波赖文生李家好柳百新 The Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

To shed a light on Xe bubble nucleation in U–Mo fuel from the view of primary irradiation damage,a reported U–Mo–Xe potential under the framework of embedded atom method has been modified within the range of short and intermediate atomic *** modified potential can better describe the interactions between energetic particles,and can accurately reproduce the threshold displacement energy surface calculated by the first-principles ***,molecular dynamics simulations of primary irradiation damage in U–Mo–Xe system have been conducted under different *** raise of Xe concentration brings about a remarkable promotion in residual defect quantity and generates bubbles in more overpressured state,which suggests an acceleration of irradiation damage under the accumulation of the fission ***,the addition of Mo considerably reduces the residual defect count and hinders irradiation-induced Xe diffusion especially at high contents of Xe,corroborating the importance of high Mo content in mitigation of irradiation damage and swelling behavior in U–Mo *** particular,the variation of irradiation damage with respect to contents suggests a necessity of taking into account the influence of local components on defect evolution in mesoscale simulations.

关键词： irradiation damage metallic fuel uranium alloy interatomic potential

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Excellent high-temperature strength of(HfZrTiTaNb)C high-entropy carbide diffusion-bonded joint via in-situ alloying of Ni/Nb/Ni composite interlayer

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Journal of advanced Ceramics 2025年第1期14卷 127-133,136-139页

作者： Ruijie Mu Ying Wang Shiyu Niu Kongbo Sun Zhenwen Yang Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300350China

To obtain high-entropy carbide(HEC)joints with excellent high-temperature performance,a(HfZrTiTaNb)C HEC joint featuring a direct diffusion-bonded interface with a Nb-based interlayer was successfully fabricated at relatively low temperatures of 1150–1250℃for 60 min under 10 *** from a modified Ni/Nb/Ni composite interlayer with a Nb content of>64 at%,an alloyed Nb_(2)Ni layer was constructed in situ by accelerating the directional diffusion of Ni atoms from the high-entropy interface into the remaining pure Nb through the Ni‒Nb eutectic ***,the excess liquid phase was squeezed out of the bonding region,ensuring the absence of Ni-based *** the intrinsic interfacial stability and sluggish diffusion effect,the HEC with its original lattice structure,was capable of developing diffusion bonding with the Nb_(2)Ni layer instead of interacting with the liquid *** high reliability of the HEC/Nb_(2)Ni bonded interface was confirmed by the coherence of(11¯3)_(HEC)//(141)_(Nb_(2))Ni and a calculated lattice misfit of *** HEC joint had a high room-temperature strength of 174 MPa because of the homogenous Nb_(2)Ni layer,which exhibited nanohardness(15.2±1.5 GPa)and an elastic modulus of 219.9±17.5 ***,the strength of the HEC joint did not decrease at 1000℃,increasing by~49%over that of HEC/Ni/HEC diffusion-bonded joints,which have stringent surface flatness *** suggested that the HEC/Nb_(2)Ni interface had excellent resistance to high-temperature softening,even though it was invariably the initial failure *** work is informative for designing bonding structures and preparing HEC components.

关键词： high-entropyceramic diffusion bonding in situ alloyed interlayer mechanical properties

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Tandem catalysis in electrocatalytic nitrate reduction:Unlocking efficiency and mechanism

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Interdisciplinary materials 2024年第2期3卷 245-269页

作者： Ziyang Wu Yanhui Song Haocheng Guo Fengting Xie Yuting Cong Min Kuang Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghaiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuanChina Helmholtz-Institute Ulm(HIU) UlmGermany

The electrochemical nitrate reduction reaction(NO_(3)RR)holds promise for ecofriendly nitrate ***,the challenge of achieving high selectivity and efficiency in electrocatalyst systems still significantly hampers the mechanism understanding and the large-scale *** catalysts,comprising multiple catalytic components working synergistically,offer promising potential for improving the efficiency and selectivity of the *** review highlights recent progress in designing tandem catalysts for electrochemical NO_(3)RR,including the noble metal-related system,transition metal electrocatalysts,and pulsed electrocatalysis ***,the optimization of active sites,interface engineering,synergistic effects between catalyst components,various in situ technologies,and theory simulations are discussed in *** and opportunities in the development of tandem catalysts for scaling up electrochemical NO_(3)RR are further discussed,such as stability,durability,and reaction *** outlining possible solutions for future tandem catalyst design,this review aims to open avenues for efficient nitrate reduction and comprehensive insights into the mechanisms for energy sustainability and environmental safety.

关键词： efficiency electrocatalytic nitrate reduction mechanism selectivity tandem catalysts

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The dynamic surface evolution of halide perovskites induced by external energy stimulation

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National science Review 2024年第4期11卷 185-194页

作者： Feiyu Cheng Pengdong Wang Chenzhe Xu Qingliang Liao Suicai Zhang Haochun Sun Wenqiang Fan Guodong Liu Zhiyun Li Yaping Kong Li Wang Fangsen Li Zhuo Kang Yue Zhang Academy for Advanced Interdisciplinary Science and Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Key Laboratory for Advanced Energy Materials and Technologies Key Laboratory of Advanced Materials and Devices for Post-Moore ChipsMinistry of EducationBeijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology Beijing Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Tracking the dynamic surface evolution of metal halide perovskite is crucial for understanding the corresponding fundamental principles of photoelectric properties and intrinsic instability. However, due to the volatility elements and soft lattice nature of perovskites, several important dynamic behaviors remain unclear. Here, an ultra-high vacuum（UHV） interconnection system integrated by surface-sensitive probing techniques has been developed to investigate the freshly cleaved surface of CH3NH3PbBr3in situ under given energy stimulation. On this basis, the detailed three-step chemical decomposition pathway of perovskites has been clarified. Meanwhile, the evolution of crystal structure from cubic phase to tetragonal phase on the perovskite surface has been revealed under energy stimulation. Accompanied by chemical composition and crystal structure evolution, electronic structure changes including energy level position,hole effective mass, and Rashba splitting have also been accurately determined. These findings provide a clear perspective on the physical origin of optoelectronic properties and the decomposition mechanism of perovskites.

关键词： metal halide perovskite external energy stimulation surface dynamic evolution surface electronic structure ultra-high vacuum interconnection system

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Micelle-directed self-assembly of single-crystal-like mesoporous stoichiometric oxides for high-performance lithium storage

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National science Review 2024年第4期11卷 195-205页

作者： Yanhua Wan Changyao Wang Xingmiao Zhang Yang Yin Mengmeng Liu Bing Ma Linlin Duan Yuzhu Ma Wei Zhang Changlin Zheng Dongliang Chao Fei Wang Yongyao Xia Wei Li Department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers College of Chemistry and Materials ScienceFudan University State Key Laboratory of Surface Physics and Department of Physics Fudan University

Due to their uncontrollable assembly and crystallization process,the synthesis of mesoporous metal oxide single crystals remains a formidable ***,we report the synthesis of single-crystal-like mesoporous Li2TiSiO5by using soft micelles as *** key lies in the atomic-scale self-assembly and step-crystallization processes,which ensure the formation of single-crystal-like mesoporous Li2TiSiO5microparticles via an oriented attachment growth mechanism under the confinement of an in-situ formed carbon *** mesoporous Li2TiSiO5anode achieves a superior rate capability(148 mAh g-1at5.0 A g-1) and outstanding long-term cycling stability(138 mAh g-1after 3000 cycles at 2.0 A g-1) for lithium storage as a result of the ultrafast Li+diffusion caused by penetrating mesochannels and nanosized crystal frameworks（5-10 nm）.In comparison,bulk Li2TiSiO5exhibits poor rate capability and cycle performance due to micron-scale diffusion *** method is very simple and reproducible,heralding a new way of designing and synthesizing mesoporous single crystals with controllable frameworks and chemical functionalities.

关键词： mesoporous materials micelles single-crystal-like Li2TiSiO5 lithium-ion batteries

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