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Nanostructure designing and hybridizing of high-capacity silicon-based anode for lithium-ion batteries

Progress in Natural science:Materials International 2023年第1期33卷 16-36页

作者： Longzhi Li Yue Deng Kunkun Hu Bangqiang Xu Nana Wang Zhongchao Bai Xun Xu Jian Yang College of Mechanical and Electronic Engineering Shandong University of Science and Technology Institute for Superconducting and Electronic Materials University of Wollongong Innovation Campus Key Laboratory of Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shandong University

Lithium-ion batteries have long been used in electronic products and electric vehicles, but their energy density is slowly failing to keep up with demand. Because of its extraordinarily high theoretical specific capacity, silicon is regarded as the most potential next-generation anode material for practical lithium-ion batteries. However, its unavoidable volume expansion issue can cause electrode deformation and loss of electrical contact during cycling,resulting in significant performance reduction. This work reviews and evaluates the modification measures of Si,SiO, and SiO2as anode materials in order to address the challenges that silicon-based anode materials *** not only review their lithium storage mechanism, but also focus on nanostructure designing and hybridizing to improve the electrochemical performance of silicon-based anodes. The silicon-based anodes can exhibit exceptional capacity retention and excellent rate performance after structural optimization and hybridization,which will greatly facilitate their commercial application. Finally, we discuss our thoughts and recommendations for the future development of silicon-based materials.

关键词： Lithium-ion batteries Silicon-based anode Nanostructure designing Hybridizing

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Tailoring the microstructural characteristics and enhancing creep properties of as-cast Mg-5Bi-5Sn alloy through Mn addition

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Journal of Magnesium and Alloys 2023年第9期11卷 3350-3361页

作者： Yi-hao Luo Wei-li Cheng Hui Yu Hong-xia Wang Xiao-feng Niu Li-fei Wang Hang Li Zhi-yong You Hua Hou School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China

The creep properties, microstructural characteristics and creep mechanisms of as-cast Mg-5Bi-5Sn(BT55) alloy without and with Mn(BTM550) addition were investigated via creep at 423, 448, and 473 K as well as stresses of 30, 50 and 75 MPa. The results indicate that adding Mn can result in the formation of primary and the dynamic precipitated α-Mn phases. In addition, the morphology of the precipitated Mg_(3)Bi_(2) phase and the orientation relationship between Mg_(2)Sn precipitates and α-Mg can be effectively modified. Tailoring the microstructural characteristics is responsible for the improved creep performance of BTM550 alloy. The dominant creep mechanisms in BT55 and BTM550 alloys are dislocation cross-slip and climb, respectively. Furthermore, twinning and pyramidal slip play an assisting part in both alloys during creep process.

关键词： Mg alloy Microstructural characteristics Creep properties Precipitates Dislocation

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Biocompatible carbon nitride quantum dots nanozymes with high nitrogen vacancies enhance peroxidase-like activity for broadspectrum antibacterial

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Nano Research 2023年第5期16卷 7237-7247页

作者： Xiaohui Dai Huan Liu Wenxiao Du Jie Su Lingshuai Kong Shouqing Ni Jinhua Zhan Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Environmental Science and Engineering Shandong UniversityJinan 250100China Institute of Eco-Environmental Forensics Shandong UniversityQingdao 266237China

Nanozyme antibacterial agents with high enzyme-like catalytic activity and strong bacteria-binding ability have provided an alternative method to efficiently disinfect drug-resistance ***,the carbon nitride quantum dots(CNQDs)nanozymes with high nitrogen vacancies(NVs)were mass-productively prepared by a simple ultrasonic-crushing method assisted by propylene *** was found that the NVs of CNQDs were stemmed from the selective breaking of surface N-(C)_(2)sites,accounting for 6.2%.Experiments and density functional theory(DFT)simulations have demonstrated that the presence of NVs can alter the local electron distribution and extend theπ-electron delocalization to enhance the peroxidase-like *** CNQDs could enter inside microorganisms by diffusion and elevate the bacteria-binding ability,which enhanced the accurate and rapid attack of·OH to the *** sterilization rate of CNQDs against Gram-negative bacteria(***),Gram-positive bacteria(***,***),fungi(***)reaches more than 99%.Thus,this work showed great potential for engineered nanozymes for broad-spectrum antibacterial in biomedicine and environmental protection.

关键词： carbon nitride quantum dots(CNQDs) nitrogen vacancies(NVs) peroxidase-like activity biocompatible broad-spectrum antibacterial

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Heterogeneous β-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl bifunctional electrocatalyst for superior concurrent conversion of glycerol and nitrite

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Journal of Energy Chemistry 2025年第5期104卷 185-193页

作者： Mingdan Wang Pengzuo Chen Huigang Wang Yanying Zhao School of Chemistry and Chemical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231ZhejiangChina

The electrochemical biomass valorization of industrial by-products or pollutants using renewable electricity offers significant promise for carbon ***,the huge challenges still exist in the development of efficient bifunctional ***,we put forward a high-efficiency coelectrolysis system by coupling the nitrite reduction reaction(NO_(2)RR)and the glycerol oxidation reaction(GOR)over a novel heterogeneous β-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl ***β-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl shows excellent bifunctional performance with high Faradaic efficiencies of formate(90.1%)and NH_(3)(91.9%)at cell voltage of 1.5 V,high yield rate of formate(89.6 mg h^(-1)cm^(-2))and NH_(3)(36.07 mg h^(-1)cm^(-2))at cell voltage of 1.9 V,and superior stability in an anion exchange membrane *** in-situ Raman result confirms the unique Co/Cu-based bimetallic synergistic sites of β-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl towards superior GOR performance,while the operando Fourier transform infrared spectroscopy demonstrates the improved protonation kinetics of key intermediates and optimized water dissociation ability ofβ-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl for high NO_(2)RR *** work illuminates alternative avenues to exploit the innovative and energy-saving technology for the co-production of high-added chemicals.

关键词： Heterogeneous catalyst β-Co(OH)_(2)/Cu_(2)(OH)_(3)Cl Bifunctional performance Nitrite reduction reaction Glycerol oxidation reaction

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Interlayer engineering in 3D graphene skeleton realizing tunable electronic properties at a highly controllable level for piezoresistive sensors

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Nano Research 2023年第7期16卷 8512-8521页

作者： Xunxiang Hu Lingling Tan Xianzhang Wu Jinqing Wang College of Material Science and Engineering Hunan Province Key Laboratory of Materials Surface&Interface Science and TechnologyCentral South University of Forestry and TechnologyChangsha 410004China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Three-dimensional(3D)graphene is a promising active component for various engineering fields,but its performance is limited by the hidebound electrical conductivity levels and hindered electrical *** we present a novel approach based on interlayer engineering,in which graphene oxide(GO)nanosheets are covalently functionalized with varied molecular lengths of diamine *** has led to the creation of an unprecedented class of 3D graphene with highly adjustable electronic *** calculations and experimental results demonstrate that ethylenediamine,with its small diameter acting as a molecular bridge for facilitating electron transport,has the potential to significantly improve the electrical conductivity of 3D *** contrast,butylene diamine,with its larger diameter,has a reverse effect due to the enlarged spacing of the graphene interlayers,resulting in conductive *** importantly,the moderate conductive level of 3D graphene can be achieved by combining the interlayer spacing expansion effect and theπ-electronic donor ability of aromatic *** resulting 3D graphene exhibits highly tunable electronic properties,which can be easily adjusted in a wide range of 2.56-6.61 S·cm^(-1)compared to pristine GO foam(4.20 S·cm^(-1)).This opens up new possibilities for its use as an active material in a piezoresistive sensor,as it offers remarkable monitoring abilities.

关键词： graphene tunable electronic properties multifunctional composites piezoresistive sensor

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Probing the interlayer mechanical coupling of 2D layered materials-A review

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Progress in Natural science:Materials International 2022年第5期32卷 528-537页

作者： Yinghui Sun Yufei Sun Rongming Wang Kai Liu Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science School of Mathematics and Physics University of Science and Technology Beijing State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University

Two-dimensional(2D) layered materials are assembled through the intralayer covalent bonds and interlayer van der Waals(vdWs) interactions. The relatively weak interlayer vdWs interactions result in the weak interlayer mechanical coupling between layers, which strongly impacts the overall mechanical properties of multilayer 2D materials or heterostructures. Experimentally probing the interlayer mechanical coupling is of vital importance on the accumulation of fundamental parameters for their applications in flexible and stretchable devices, yet there are hardly comprehensive reviews in this research field. In this review, we firstly introduce the probing methods of interlayer mechanical coupling, including high-frequency and ultralow-frequency Raman characterizations,nanoindentation of multilayer 2D materials or heterostructures, surface indentation, pressurized blister test,characterization of spontaneously formed nanoblisters, and nano-friction tests. Based on the analysis and comparison of the existing methods and results, we also discuss the advantages and limitations of each ***, the challenges and opportunities in this promising field are discussed. This review summarizes the recent progress in the probing of interlayer mechanical coupling of 2D layered materials and will provide important reference for the rational design of flexible and stretchable devices.

关键词： van der Waals interaction Mechanical properties Indentation Heterostructures

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One-pot synthesis of a giant twisted double-layer chiral macrocycle via [4+8] imine condensation and its X-ray structure

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Chinese Chemical Letters 2024年第10期35卷 241-243页

作者： Yu Pang Min Wang Ning-Hua Yang Min Xue Yong Yang School of Science Department of PhysicsKey Laboratory of Optical Field Manipulation of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China School of Chemistry and Chemical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou310018China

Trifluoroacetic acid(TFA)catalyzed condensation reaction between tetraaminooxacalix[4]arene and N-alkylcarbazole-3,6-dicarbaldehyde in CH_(2)Cl2afforded a single product in 87%–89%***-defined yet undissolvable1H NMR spectra suggested formation of robust and discrete structures in solution.X-ray single crystal analysis further revealed a giant twisted double-layer chiral macrocycle in the solid state,which was formed from[4+8]condensation of the two reactants via 16 imine *** calculations discovered that only the[4+8]twisted product is thermodynamically favorable,which accounts for its highly selective and efficient formation out of a library of many other combinations.

关键词： One-pot synthesis Oxacalix[4]arene Dynamic covalent chemistry Chiral macrocycle X-ray single crystal

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Competition between strong and weak carbide-forming elements in monolayer mixed oxide formation on (TiZrNbMoAl)C: Experimental and first-principles study

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Ceramics International 2025年第18期51卷 26948-26959页

作者： Tang, Lin Pan, Qian Yan, Kangkai Wang, Junjun Gao, Zhongliang Wang, Linqing Huang, Weijiu College of Materials Science and Engineering Chongqing University of Technology Chongqing400054 China College of Science Chongqing University of Technology Chongqing400054 China Chongqing Key Laboratory of Materials Surface & Interface Science Chongqing University of Arts and Sciences Yongchuan Chongqing402160 China

High-entropy carbide coatings exhibit exceptional properties and have extensive applications. However, the mechanisms underlying surface oxidation and the microstructural evolution of oxide layers remain unclear. This study systematically investigates these aspects for the (TiZrNbMoAl)C (THC-1) coating through experimental approaches and first-principles calculations. The THC-1 coating, successfully deposited via magnetron sputtering, possesses a face-centered cubic (FCC) structure and demonstrates good adhesion to the substrate. After annealing for 30 min at 800 °C, a uniform monolayer of mixed metal oxides was observed, differing from the multilayer oxide structures typically found in traditional alloys. Theoretical results revealed that O atoms preferentially occupy the hollow FCC sites with higher concentrations of strong carbide-forming elements (Ti, Zr) to form stable oxides, followed by weak carbide-forming elements (Al, Mo). However, the stronger interactions between the weak carbide-forming elements and O resulted in the formation of more stable oxides. Therefore, the competition among carbide-forming elements promotes the formation of a monolayer mixed oxide on the surface of THC-1 coating. Additionally, Ti can weaken the Al-O interactions, with a more pronounced effect observed at higher Ti concentrations. Hence, an optimal Ti content should be considered to improve the oxidation resistance of THC-1. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Monolayers

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Cephalopods-inspired Repairable MWCNTs/PDMS Conductive Elastomers for Sensitive Strain Sensor

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Chinese Journal of Polymer science 2022年第4期40卷 384-393页

作者： Kaiming Zhang Zhe Wang Yuetao Liu Haoyu Zhao Chuanhui Gao Yumin Wu State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials(Ministry of Education) Shandong UniversityJinan 250100China

Flexible electronic devices based on reversible bonds for self-curing capabilities arouses extensive ***,most of the composite conductive elastomers have the problems of poor mechanical properties and slow recovery of mechanical properties during multiple stretching,which hinder their stability in continuous *** this study,hyperbranched-MWCNTs/hyperbranched-PDMS self-healable conductive elastomers inspired by cephalopods were successfully *** prepared conductive elastomer exhibited good self-healing ability(91%)at room temperature excited by multiple reversible *** prepared elastomer showed outstanding mechanical properties and anti-fatigue ability,so that it can cope with more arduous ***,the elastomer was sensitive to the change of stress states and can be used as a stable strain ***,the self-repairing conductive elastomer has potential practicability in the fields of human-computer interaction,motion monitoring,soft robot and so on.

关键词： Self-healable Reversible interactions Hyperbranched Anti-fatigue Strain sensor

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Effect of T6 Treatment on the Microstructure and Properties of Mg-Zn-Ce with Different Zn Contents 75

Effect of T6 Treatment on the Microstructure and Properties ...

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75th World Foundry Congress, WFC 2024

作者： Jiang, Aoxue You, Zhiyong Jin, Shuaishuai Sun, Chunle Wang, Kaiying Institute of Energy Innovation Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education College of Materials Science and Engineering Taiyuan University of Technology 030024 China

The alloy compositions and heat treatment processes of Mg-Zn-Ce were designed and formulated based on phase diagram calculations. Mg-5Zn-0.2Ce and Mg-7Zn-0.3Ce alloys with different Zn contents were prepared through rapid solidification and T6 treatment. The study showed that when the Zn content is less than its maximum solubility in Mg (6.2 wt.%), T6 heat treatment results in a coarse microstructure and the occurrence of secondary recrystallization. When the Zn content is greater than 6.2 wt.%, T6 heat treatment refines the grains and significantly improves the mechanical properties. However, T6 treatments will generally produce a large number of MgZn and Mg12Ce precipitates distributed within the MgZn-Ce alloy microstructure. These precipitates greatly enhance the comprehensive mechanical properties of the alloy. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Rapid solidification

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