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A pH-universal ORR catalyst with atomic Fe-heteroatom(N,S)sites for high-performance Zn-air batteries

Nano Research 2023年第7期16卷 9416-9425页

作者： Le Li Na Li Jia-Wei Xia Shi-Long Zhou Xing-Yue Qian Feng-Xiang Yin Guo-Hong Dai Guang-Yu He Hai-Qun Chen Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterSchool of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Jiangsu Urban and Rural Construction Vocational College Changzhou 213147China

Developing innovative,easy-to-manufacture,and non-Pt-group-metal(non-PGM)electrocatalysts is essential for the highly efficient oxygen reduction reaction(ORR).Herein,we report a self-sacrificing post-synthetic strategy to synthesize highly loaded Fe-isolated single atoms anchored on the hierarchical porous N,S co-doped carbon matrix(Fe-SAs/S,N-C/rGO).The optimized Fe-SAs/S,N-C/rGO exhibits excellent ORR activity in the pH-universal range with half-wave potentials of 0.89,0.80,and 0.60 V in alkaline,acidic,and neutral media,comparable to the commercial Pt/C(0.85,0.81,and 0.64 V,respectively).The homemade liquid Zn-air battery(ZAB)with Fe-SAs/S,N-C/rGO as the cathode catalyst displays an open-circuit voltage(OCV)of~1.61 V,discharging specific capacity of 817.23 mAh·g^(-1),and long-term durability of~1865 cycles,outperforming those of the device with commercial Pt/C+RuO_(2)(1.49 V,657.32 mAh·g^(-1),and~120 cycles,respectively).Intriguingly,the corresponding flexible solidstate ZAB delivers satisfactory OCV,peak power density,foldability,and cycling stability at room temperature,as well as adaptability at a low temperature of -10℃.Besides,density functional theory(DFT)calculation reveals that the atomic FeN_(3)S moieties in Fe-SAs/S,N-C/rGO can cause charge redistribution and lower the binding strength of oxygen-containing intermediates,resulting in accelerated ORR kinetics and optimized catalytic *** work provides insights into experimental and theoretical guidance towards non-PGM electrocatalysts for efficient energy conversion.

关键词： heteroatom dopant single-atom electrocatalyst FeN_(3)S sites Zn-air battery density functional theory(DFT)study

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Causal reasoning in typical computer vision tasks

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Science China(Technological Sciences) 2024年第1期67卷 105-120页

作者： ZHANG KeXuan SUN QiYu ZHAO ChaoQiang TANG Yang Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China National Key Laboratory of Air based Information Perception and Fusion Luoyang 471000China Luoyang Institute of Electro Optical Equipment of Avic Luoyang 471000China

Deep learning has revolutionized the field of artificial *** on the statistical correlations uncovered by deep learning-based methods,computer vision tasks,such as autonomous driving and robotics,are growing *** being the basis of deep learning,such correlation strongly depends on the distribution of the original data and is susceptible to uncontrolled *** the guidance of prior knowledge,statistical correlations alone cannot correctly reflect the essential causal relations and may even introduce spurious *** a result,researchers are now trying to enhance deep learningbased methods with causal *** theory can model the intrinsic causal structure unaffected by data bias and effectively avoids spurious *** paper aims to comprehensively review the existing causal methods in typical vision and visionlanguage tasks such as semantic segmentation,object detection,and image *** advantages of causality and the approaches for building causal paradigms will be *** roadmaps are also proposed,including facilitating the development of causal theory and its application in other complex scenarios and systems.

关键词： causal reasoning computer vision tasks vision-language tasks semantic segmentation object detection

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Organopolysulfides as high-performance cathode materials for rechargeable aluminum-ion batteries

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Journal of Materials Science & technology 2023年第23期154卷 159-165页

作者： Weiqin Chu Xu Zhang Fulong Zhu Shuaixia Li Yongzhu Fu Haijun Yu Institute of Advanced Battery Materials and Devices Faculty of Materials and Manufacturing Beijing University of Technology Beijing 100124 China Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of Technology Beijing 100124 China College of Chemistry Zhengzhou University Zhengzhou 450001 China

The development of aluminum-ion batteries(AIBs)is significantly confined by the limited high-performance cathode ***,organopolysulfides are investigated as active cathode materials to fabricate AIBs.A liquid-phase phenyl tetrasulfide(PTS)can deliver a capacity above 600 mAh g−1 after activation,with the maintenance of 253 mAh g−1 after 100 *** to the different S locations,PTS shows several voltage plateaus and an average voltage of∼0.7 V ***3+/Al with no decay upon *** importantly,the liquid PTS can serve as a high-Coulombic-efficiency cathode(∼99.88%±0.57%after stabilization),enlighting the design of high-efficiency and low-resistance conversion-type cathode materials for *** experimental characterizations accompanied by theoretical calculations,it is found that PTS undergoes stepwise reaction procedures during discharge with final products of Al2S3 and AlCl2-coordinated phenyl sulfide,and partially reforms with elemental S and other organopolysulfides during *** study demonstrates new opportunities for the design of high-efficiency conversion-type cathode materials for advanced AIBs.

关键词： Aluminum-ion batteries Cathode materials Organopolysulfides High coulombic efficiency

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From ultra-low friction to superlubricity state of black phosphorus:Enabled by the critical oxidation and load

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Friction 2023年第10期11卷 1829-1844页

作者： Qiang LI Fenghua SU Yanjun CHEN Jianfang SUN School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou 510640China

Based on the density functional theory(DFT),we investigate the friction properties of inevitable oxidized black phosphorus(o-BP).o-BP with the weaker interlayer adhesion exhibits their great potential as a solid *** the zero load,the friction property of o-BP is adjusted by its oxidation ***,ultra-low friction of P4O2(50%oxidation,O:P=2:4=50%)is obtained,which is attributed to the upper O atoms with lower sliding resistance in the O channel formed by lower layer O *** attractive,we observe superlubricity behavior of o-BP at the critical load/distance due to the flattening potential energy surface(PES).The flattening PES is controlled by the electrostatic role for the high-load(P4O3,O:P=3:4=75%),and by the electrostatic and dispersion roles for the low-load(P4O2).Distinctly,the transform from ultra-low friction to superlubricity state of black phosphorus(BP)can be achieved by critical oxidation and load,which shows an important significance in engineering *** addition,negative friction behavior of o-BP is a general phenomenon(Z>Z_(min),Z_(min)is the interlayer distances between the outermost P atoms of minimum load.),while its surface-surface model is different from the fold mechanism of the tip-surface model(Z_(0)Z_(min)).In summary,o-BP improves the friction performance and reduces the application limitation,comparing to graphene(Gr),MoS2,and their oxides.

关键词： oxidized black phosphorus(o-BP) ultra-low friction superlubricity critical load/distance first-principles

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States of graphene oxide and surface functional groups amid adsorption of dyes and heavy metal ions

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Chinese Journal of Chemical Engineering 2023年第11期63卷 197-208页

作者： Zhaoyang Han Ling Sun Yingying Chu Jing Wang Chenyu Wei Qianlei Jiang Changbao Han Hui Yan Xuemei Song Institute of Advanced Energy Materials and Devices Faculty of Materials and ManufacturingKey Laboratory of Advanced Functional Materials of Education Ministry of ChinaBeijing University of TechnologyBeijing 100124China Beijing Guyue New Materials Research Institute Beijing University of TechnologyBeijing 100124China

Water pollution regarding dyes and heavy metal ions is crucial facing the *** to effectively separate these contaminants from water has been a key *** oxide(GO)promises the greenwater world as a long-lasting spotlight adsorbent material and therefore,harnessing GO has been the research hotspot for over a *** state of GO as well as its surface functional groups plays an important role in *** the way of preparation and structural modification matters to the performance of *** this review,the significance of the state of existence of stock GO and surface functional groups is explored in terms of preparation,structural modification,and ***,various adsorbates for GO adsorption are also involved,the discussion of which is rarely established elsewhere.

关键词： Stock graphene oxide Surface functional groups Existence state Adsorbates Enhanced adsorption Dyes

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Hybrid Dynamic Variables-Dependent Event-Triggered Fuzzy Model Predictive control

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 723-733页

作者： Xiongbo Wan Chaoling Zhang Fan Wei Chuan-Ke Zhang Min Wu IEEE the School of Automation China University of Geosciencesthe Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systemsand the Engineering Research Center of Intelligent Technology for Geo-ExplorationMinistry of EducationWuhan 430074China

This article focuses on dynamic event-triggered mechanism(DETM)-based model predictive control(MPC) for T-S fuzzy systems.A hybrid dynamic variables-dependent DETM is carefully devised,which includes a multiplicative dynamic variable and an additive dynamic *** addressed DETM-based fuzzy MPC issue is described as a “min-max” optimization problem(OP).To facilitate the co-design of the MPC controller and the weighting matrix of the DETM,an auxiliary OP is proposed based on a new Lyapunov function and a new robust positive invariant(RPI) set that contain the membership functions and the hybrid dynamic variables.A dynamic event-triggered fuzzy MPC algorithm is developed accordingly,whose recursive feasibility is analysed by employing the RPI *** the designed controller,the involved fuzzy system is ensured to be asymptotically *** examples show that the new DETM and DETM-based MPC algorithm have the advantages of reducing resource consumption while yielding the anticipated performance.

关键词： Dynamic event-triggered mechanism(DETM) hybrid dynamic variables model predictive control(MPC) robust positive invariant(RPI)set T-S fuzzy systems

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Cl-terminated decoration to modulate the permittivity of MXene for enhanced electromagnetic-absorbing performance

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Journal of Materials Science & technology 2024年第12期179卷 187-197页

作者： Yunfei He Dongdong Liu Qiang Su Bo Zhong Long Xia Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264009China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China

The explosive growth of communication technology has given rise to a large number of high-quality electromagnetic wave(EMW)absorbing materials,and single-component materials are often difficult to satisfy the *** this study,we propose an etching method of molten chlorine salts under vac-uum to prepare Cl-terminated MXene(MX-Cl)which can meet the requirements of"thin,light,wide and strong"and realize the application of single-component absorbing *** the X and Ku bands,MX-Cl achieves a strong reflection loss of-42.99 dB and an effective absorption bandwidth of 3.44 GHz with the 1.2 mm matching *** presence of Cl groups restricts the free electron movement of surface-Ti,which controls the conductivity of the MX-Cl and optimizes its *** polarization induced by Ti-Cl,interfacial polarization between MXene layers and multiple scattering effects inside the layers all significantly increase the dielectric loss of the MX-Cl *** study provides a new approach to investigating the effect of single atoms on the dielectric properties of *** work also offers a simple and low-cost process for the preparation of single-component MXene EMW-absorbing materials.

关键词： Cl-terminated MXene Conductivity mechanism Multi-polarization effect Electromagnetic wave absorption

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Thickness Measurement of Single-Mode Fiber Coating Layer Based on Forward Brillouin Scattering

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IEEE Sensors Journal 2025年第11期25卷 19332-19340页

作者： Zhang, Yongqi Wang, Tao Liu, Yijia Liu, Li Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronic Engineering Taiyuan030024 China Taiyuan University of Technology Shanxi Key Laboratory of Precision Measurement Physics The College of Physics and Optoelectronic Engineering Taiyuan030024 China

The coating layer is essential for protecting and applying optical fibers. Nowadays, the thickness measurement of the coating layer relies on point measurement schemes, such as the side-looking light distribution method and mechanical method. However, there are some problems with the above methods, such as the tradeoff between resolution and field of view (FOV), the cutting of the measurement position, and the long measurement time. To overcome these problems, we propose a new method based on forward Brillouin scattering (FBS), which measures the coating layer thickness of single mode fibers (SMFs). The physical properties of the transverse acoustic field involved in FBS make it possible to measure the thickness of the fiber coating. The corresponding relationship between the transverse acoustic mode frequency and the diameter of the coating layer can be calculated. The coating layer thickness can be measured with high precision by measuring the frequency spectrum of FBS corresponding to multiple transverse acoustic modes at a given temperature. In the verification experiment, three types of SMF coated with polyimide are used as the sensing fiber to measure the thickness of the coating layer at multiple temperatures. The experimental results show that the error in the coating layer thickness obtained is less than 0.05 μm. To the best of our knowledge, this is the first demonstration of nondestructive, high-precision monitoring of fiber coating thickness. © 2025 IEEE.

关键词： Acoustic field measurement

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A Kinematic Errors Prediction and Accuracy Improvement Method of Guide Rail Based on Assembly and manufacturing Analysis 9

A Kinematic Errors Prediction and Accuracy Improvement Metho...

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9th International Conference on Mechanical Engineering, Materials, and Automation technology, MMEAT 2023

作者： Niu, Peng Cheng, Qiang Chen, Kui Yang, Congbin Institute of Advanced Manufacturing and Intelligent Technology Beijing University of Technology Beijing100124 China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing100124 China

ISBN: (纸本)9781510668584

At the design stage of a machine tool, how to accurately predict and analyze the motion error of linear axis system is a difficult problem for designers. This research is of great significance to optimize the initial design scheme of the machine tool and improve the geometric accuracy. A kinematic errors prediction and accuracy improvement method of guide rail based on assembly and manufacturing analysis was proposed. Firstly, the distribution law of bolt preload under a specific assembly sequence was revealed by finite element analysis (FEA). Based on a probability analysis of assembly parameters, the statically indeterminate mechanical model of guide rail assembly deformation was established. Secondly, a Fourier function with tolerance as amplitude was established to characterize the surface topography of the guide rail installation base surface satisfying Dirichlet boundary conditions. Based on the influence of manufacturing and assembly, the final profile curve function of the guide rail is obtained, and the straightness and angular kinematics error (SAEs) are accurately predicted. The prediction accuracy of the straightness error is 98.5%. Referring to the prediction results, the targeted accuracy improvement measures for the linear axis platform are proposed. The straightness kinematics error of the guide rail is reduced from 9.11um to 4.28um. The proposed method can accurately predict the motion error of the guide rail and guide the precision improvement of the linear axis. © 2023 SPIE.

关键词： Machine tools

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Superior piezoelectric performance with high operating temperature in bismuth ferrite-based ternary ceramics

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Journal of Materials Science & technology 2024年第2期169卷 172-181页

作者： Yunyao Huang Leiyang Zhang Ruiyi Jing Yang Yang Vladimir Shur Xiaoyong Wei Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia

Due to the thermal depolarization effect,adequate piezoelectric performance with high operating temperature is regarded to be challenging to accomplish concurrently in piezoceramics for applications in specific piezoelectric *** this work,we synthesized(0.8−x)BiFeO_(3)-x PbTi_(3)-0.2Ba(Zr_(0.25)Ti_(0.75))O_(3)(abbreviated as BFO-x PT-BZT)ternary solid solutions with 0.15≤x≤0.30 by conventional solid-state reaction *** MPB composition with a coexisting state of rhombohedral-tetragonal phases exhibits enhanced electromechanical properties,including Curie temperature of 380℃,large-signal equivalent piezoelectric coefficient d^(∗)_(33)of 395 pm V^(-1),small-signal piezoelectric coefficient d_(33)of 302 pC N^(-1),and electromechanical coupling factor k_(p)of 50.2%,which is comparable to commercial PZT-5A ceramics,indicating potential in high-temperature ***,in-situ X-ray diffraction(XRD)and piezoelectric force microscopic(PFM)techniques demonstrate that multiphase coexistence and complex nanodomains promote piezoelectric response via *** x=0.24 composition exhibits the highest in-situ d_(33)of 577 pC N^(-1)and good temperature stability in 30−280℃,indicating that BZT-modified BFO-PT ceramics are promising candidates for high-temperature piezoelectric devices.

关键词： High-temperature piezoelectrics Morphotropic phase boundary In-situ technique Domain structure BFO

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