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Rational design and synergistic effect of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves for highly selective electrochemical CO_(2)reduction

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Nano Research 2023年第7期16卷 8910-8918页

作者： Songyuan Yang Minghang Jiang Miao Wang Lei Wang Xinmei Song Yaoda Wang Zuoxiu Tie Zhong Jin State key laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Chemistry School of ScienceXihua UniversityChengdu 610039China Suzhou Tierui New Energy Technology Co. Ltd.Suzhou 215228China Nanjing Tieming Energy Technology Co. Ltd.Nanjing 210093China

The electrocatalytic CO_(2)reduction reaction(CO_(2)RR)is regarded as a promising route for renewable energy conversion and storage,but its development is limited by the high overpotential and low stability and selectivity of ***,it is complicated to accurately adjust the nanostructure of electrocatalysts,which impacts ***,we propose the rational design and controlled preparation of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves(Ag-NDs/Zn-NLs)for highly selective electrocatalytic CO_(2)*** Ag-NDs/Zn-NLs can be in-situ grown on copper foil with simple electrodeposition and replacement *** from the coordination and synergistic effect of Zn and Ag species,the reconstruction of Zn surface and the agglomeration of Ag-NDs are efficiently prevented,bringing high activity and durable electrocatalytic stability for CO_(2)-to-CO *** Faradaic efficiency for CO production reaches 85.2%at a moderate applied potential of-1.0 V *** hydrogen electrode(RHE).This study provides a promising approach for controlling the catalytic activity and selectivity of CO_(2)RR through the structural adjustment and decoration of transition metal based nanocatalysts.

关键词： electrochemical CO_(2)reduction electrodeposited nanoleaf structure silver nanodot transition metal heterostructure electrocatalytic selectivity and durability

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Porous carbon/Fe composites from waste fabric for high-efficiency electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第31期126卷 266-274页

作者： Jin-Bo Cheng Hai-Bo Zhao Ai-Ning Zhang Yan-Qin Wang Yu-Zhong Wang Collaborative Innovation Center for Eco-Friendly and Fire-safety Polymeric Materials(moe) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco-Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064China

Nowadays,a large amount of waste fabrics has brought huge environmental and resource problems,while the traditional recycling routes are downcycling with low efficiency and complex separation ***,we demonstrate a green and facile route to up-recycle waste fabrics(cotton-polyester blending or cotton fabrics)into a high-performance microwave *** this design,an assistant coating was deposited onto the fiber surface of the waste fabric through the assembly of tannic acid-Fe^(2+)(TA-Fe^(2+)),which effectively catalyzed the polymer fiber into highly graphitized porous carbon fiber at high ***,the Fe nanoparticles from the reduction of Fe^(2+)ions were evenly embedded on the surface of porous carbon ***,the resultant porous carbon/Fe composites with hierarchi-cal microstructures displayed excellent microwave absorption ***,the microwave ab-sorber from waste polyester-cotton blended fabric could reach a minimum reflection loss(RL)of-50.5 dB at a thin coating thickness of 1.7 mm,and the minimum RL from waste cotton fabric absorber reached-47.1 dB at a thickness of 2.5 *** work provides a new idea to convert waste fabrics into high value-added microwave absorbing materials in a simple and environmentally friendly way,which will help reuse resources and protect the environment.

关键词： Up recycling Microwave absorption Waste fabrics Thin thickness

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Thermotolerant and fireproof gel polymer electrolyte toward high-performance and safe lithium-ion battery

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Journal of Energy Chemistry 2022年第2期31卷 9-18页

作者： Man-Cheng Long Ting Wang Ping-Hui Duan You Gao Xiu-Li Wang Gang Wu Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-safety Polymeric Materials(moe) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Poly(ethylene oxide)(PEO)and its derivatives based gel polymer electrolytes(GPEs)are severely limited in advanced and safe lithium-ion batteries(LIBs)owing to the intrinsically high flammability of liquid electrolytes and *** adding flame retardants to the GPEs can suppress their flammability and thus improve the safety of LIBs,but results in deteriorative electrochemical ***,a novel GPE with chemically bonded flame retardant(*** vinylphosphonate)in cross-linked polyethylene glycol diacrylate matrix,featuring both high-safety and high-performance,is *** as-prepared GPE storing the commercial 1 mol L^(-1) LiPF6 electrolyte resists high temperature of 200℃and cannot be ignited as well as possesses a high ionic conductivity(0.60 m S cm^(-1))and good compatibility with ***,the LiFePO_(4)/Li battery with this GPE delivers a satisfactory capacity of 142.2 m A h g^(-1) and a superior cycling performance with a capacity retention of 96.3%and a coulombic efficiency of close to 100%for 350 cycles at 0.2 C under ambient ***,the battery can achieve steady charge–discharge for 100 cycles with a coulombic efficiency of 99.5%at 1 C under 80℃and run normally even at a high temperature of 150℃or under the exposure to butane *** scanning calorimetry manifests significantly improved battery safety compared to commercial battery *** work provides a new pathway for developing next-generation advanced LIBs with enhanced performance and high safety.

关键词： Gel polymer electrolyte Poly(ethylene oxide) Flame retardant Vinylphosphonate Lithium-ion batteries

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Chemically recyclable copolyesters from bio-renewable monomers:controlled synthesis and composition-dependent applicable properties

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Science China Chemistry 2023年第7期66卷 2062-2069页

作者： Wan-Ting Xiong Gang Wu Si-Chong Chen Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-safety Polymeric Materials(moe) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

The development of chemically recyclable polymers is a promising solution to address the dual challenges of the environment and resources caused by petroleum-based *** recent advancements,it is highly desirable for developing recyclable polymers to meet the requirements of both practical uses and well-performed ***-renewable monomers have been paid great attention recently as promising potential candidates for establishing a sustainable circular polymer ***,a sequential copolymerization of various bio-renewable n-alkyl substituted δ-valerolactone((R)VLs)and p-dioxanone(PDO)is conducted to synthesize novel chemically recyclable diblock copolymers poly(p-dioxanone)-block-poly(n-alkyl-valerolactones)(PPDO-b-P(R)VLs)with well-defined and controlled *** properties of copolymers including thermal property,crystallization,mechanical property,hydrophilicity and transport property can be tuned effectively to meet the requirements of practical uses by alternating the alkyl substituents(R)and the P(R)VLs *** addition,the high-efficiency and facile chemical recycling of copolymers to PDO and(R)VL comonomers is realized with a high yield of>96.5%and a high purity of 99%.

关键词： bio-renewable monomers ring-opening polymerization block copolyester tunable properties chemical recyclability

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Moiré-superlattice MXenes enabled ultra-stable K-ion storage in neutral electrolyte

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Nano Research 2023年第4期16卷 5006-5017页

作者： Qiong Wu Yanhui Xue Shaofei Chao Fufa Wu Muhammad Sufyan Javed Lu Li Wei Zhang School of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China key laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China key laboratory of Automobile Materials moe School of Materials Science&EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China

Ti_(3)C_(2)MXene is an auspicious energy storage material due to its metallic conductivity and layered ***,in the real working condition of electrochemical energy storage with long cycle charging-discharging,a structural collapse is usually caused by the stacking of its layers creating a large attenuation of specific *** by the superlattice effect of magic angle graphene,we conducted microscopical regulation of rotation mismatch on the Ti_(3)C_(2)lattice;consequently,a hexagonal fewlayered Ti_(3)C_(2)free-standing film constructed with Moiré-*** finding not only solves the problem of Ti_(3)C_(2)structural collapse but also dramatically improves the specific capacitance of Ti_(3)C_(2)as a supercapacitor electrode under long cycle charging and *** ultra-stable energy storage of this electrode material in a neutral aqueous electrolyte was ***,the formation mechanism of rotating Moirépattern is revealed through microscopy and microanalysis of the produced Moirépattern,assisted with modeling and analyzing the underlying mechanism between the Moirépattern and the rotation *** work provides experimental and theoretical support for future construction of Moiré-superlattice structure for a wide range of MXene phases and is undoubtedly promoting the development of MXene materials in the field of energy storage.

关键词： Ti_(3)C_(2)MXene Moiré-superlattice microwave-assisted etching specific capacitance

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Electrode-compatible fluorine-free multifunctional additive regulating solid electrolyte interphase and solvation structure for high-performance lithium-ion batteries

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能源化学:英文版 2023年第8期83卷 239-246,I0008页

作者： Qing-Song Liu Yi-Zhou Quan Mei-Chen Liu Guo-Rui Zhu Xiu-Li Wang Gang Wu Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-safety Polymeric Materials(moe) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064SichuanChina

The rapid development and widespread application of lithium-ion batteries(LIBs) have increased demand for high-safety and high-performance LIBs. Accordingly, various additives have been used in commercial liquid electrolytes to severally adjust the solvation structure of lithium ions, control the components of solid electrolyte interphase, or reduce flammability. While it is highly desirable to develop low-cost multifunctional electrolyte additives integrally that address both safety and performance on LIBs, significant challenges remain. Herein, a novel phosphorus-containing organic small molecule, bis(2-methoxyethyl) methylphosphonate(BMOP), was rationally designed to serve as a fluorine-free and multifunctional additive in commercial electrolytes. This novel electrolyte additive is low-toxicity,high-efficiency, low-cost, and electrode-compatible, which shows the significant improvement to both electrochemical performance and fire safety for LIBs through regulating the electrolyte solvation structure, constructing the stable electrode-electrolyte interphase, and suppressing the electrolyte combustion. This work provides a new avenue for developing safer and high-performance LIBs.

关键词： Multifunctional additives Electrode compatibility Solid electrolyte interface Solvation structure Lithium-ion batteries

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Adaptive Change Detection for Long-Term Machinery Monitoring Using Incremental Sliding-Window

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Chinese Journal of Mechanical Engineering 2017年第6期30卷 1338-1346页

作者： Teng Wang Guo-Liang Lu Jie Liu Peng Yan key laboratory of high-efficiency and Clean Mechanical Manufacture of moe School of Mechanical EngineeringShandong University Department of Mechanical and Aerospace Engineering Carleton University

Detection of structural changes from an opera- tional process is a major goal in machine condition moni- toring. Existing methods for this purpose are mainly based on retrospective analysis, resulting in a large detection delay that limits their usages in real applications. This paper presents a new adaptive real-time change detection algorithm, an extension of the recent research by combin- ing with an incremental sliding-window strategy, to handle the multi-change detection in long-term monitoring of machine operations. In particular, in the framework, Hil- bert space embedding of distribution is used to map the original data into the Re-producing Kernel Hilbert Space （RK_HS） for change detection; then, a new adaptive threshold strategy can be developed when making change decision, in which a global factor （used to control the coarse-to-fine level of detection） is introduced to replace the fixed value of threshold. Through experiments on a range of real testing data which was collected from an experimental rotating machinery system, the excellent detection performances of the algorithm for engineering applications were demonstrated. Compared with state-of- the-art methods, the proposed algorithm can be more suitable for long-term machinery condition monitoring without any manual re-calibration, thus is promising in modern industries.

关键词： Machine monitoring Change detection Long-term monitoring Adaptive threshold

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Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer

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Frontiers of Information Technology & Electronic Engineering 2019年第9期20卷 1221-1233页

作者： Mingjie LI Jian-hua WEI Jin-hui FANG Wen-zhuo SHI Kai GUO State key laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China moe key laboratory of high efficiency and Clean Mechanical Manufacture Shandong UniversityJinan 250061China

In this paper,we deal with both velocity control and force control of a single-rod electro-hydraulic actuator subject to external disturbances and parameter *** some implementations,both velocity control and force control are *** control and an extended disturbance observer are combined to solve this *** control is applied to regulate the dynamic relationship between the velocity and output force of the actuator,which can help avoid impact and keep a proper contact force on the environment or *** of impedance rules are regulated by a fuzzy *** extended disturbance observer is employed to account for external disturbances and parameter uncertainties to achieve an accurate velocity tracking.A detailed model of load force dynamics is presented for the development of the extended disturbance *** stability of the whole system is *** results demonstrate that the proposed control strategy has not only a high velocity tracking performance,but also a good force adjustment performance,and that it should be widely applied in construction and assembly.

关键词： Fuzzy control Impedance control Disturbance observer Parameter uncertainties Electro-hydraulic actuator

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Progress in densification and toughening of high entropy carbide ceramics

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Journal of Materials Science & Technology 2023年第30期161卷 10-43页

作者： Zhennan Cao Jialin Sun Lingtao Meng Keguo Zhang Jun Zhao Zhifu Huang Xialun Yun School of Mechanical Electrical&Information EngineeringShandong University(Weihai)Weihai 264209China State key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shenzhen Research Institute of Shandong University Shenzhen 518057China key laboratory of high efficiency and Clean Mechanical Manufacture of moe School of Mechanical EngineeringShandong UniversityJinan 250061China State key laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China State key laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China

high entropy carbide ceramics(HECC)are solid solution of inorganic compounds with five or more prin-cipal metal *** interests in HECC are dramatically sparked by the enormous possibilities in composition-microstructure-property *** widely acknowledged,HECCs enjoy higher hardness and oxidation/corrosion/wear resistance,as well as lower thermal conductivity than conventional engi-neering carbide ceramics,making them the most potential candidates for state-of-the-art structural and functional applications in extreme service *** the advantages,however,the poor den-sification coupled with low fracture toughness significantly limited the practical applications of *** to the difficulty,the literature available for toughening HECC is woefully *** considera-tion of this insufficiency,we apply towards offer a comprehensive,critical review of the mechanical be-havior of HECC,highlighting the densification enhancing strategies(carbon content,sintering techniques,grain size,sintering aids,etc.)as well as toughening methods including particle toughening,whisker/fiber toughening,synergistic toughening,graphene-carbon nanotube toughening,to further the service reliabil-ity of HECC in practical industrial ***,despite some significant successes,important directions for further development of HECC are given as multi-dimensional gradient HECC,additive man-ufacturing of HECC,processing-composition-microstructure-property relationship prediction and genomes of HECC based on machine learning,and high-throughput computing,etc.

关键词： high entropy carbide ceramic Densification Toughening Mechanical properties

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Increased Oxygen Evolution Activity in pH-Universal Electrocatalyst: Urea-Modified NiFeCoCN Medium-Entropy Alloy

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Chinese Journal of Chemistry 2023年第23期41卷 3290-3298页

作者： Hongwei Lv Zhiguo Ye Feng Pei Xinyuan Peng Juntong Huang Duosheng Li Zhong Jin School of Material Science and Engineering Nanchang Hangkong University696#FengHeNan RoadNanchangJiangxi330063 China State Grid Jiangxi Electric Power Research Institute NanchangJiangxi330096 China moe key laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China

The kinetic process of a slow oxygen evolution reaction (OER) always constrains the efficiency of overall water electrolysis for H2 *** particular,nonprecious metal electrodes for the OER have difficulty in possessing excellent electrocatalytic activity and stability in pH-universal media *** this work,urea is first used as a pore-forming agent and active C/N source to fabricate a nanoporous NiFeCoCN medium-entropy alloy (MEA) by high-temperature sintering based on the nanoscale Kirkendall *** NiFeCoCN MEA achieves an overpotential of 432 mV at a current density of 10 mA·cm^(-2) and a lower Tafel slope of 52.4 mV·dec^(-1) compared to the IrO_(2)/Ti electrode (58.6 mV·dec^(-1)) in a 0.5 mol/L H_(2)SO_(4) *** a 1 mol/L KOH solution,the NiFeCoCN MEA obtains an overpotential of 175 mV for 10 mA·cm^(-2) and a Tafel slope of 40.8 mV·dec^(-1),which is better than IrO_(2)/Ni *** work proves a novel strategy to design and prepare nanoporous MEA materials with desirable C/N species,which provides promising prospects for the industrial production of H2 energy.

关键词： Oxygen evolution reaction Medium-entropy alloy Urea Electrocatalytic activity Stability

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