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Water molecules and oxygen-vacancy modulation of vanadium pentoxide with fast kinetics toward ultrahigh power density and durable flexible all-solid-state zinc ion battery

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Journal of Energy Chemistry 2023年第10期85卷 581-591,I0014页

作者： Wenda Qiu Yunlei Tian Shuting Lin Aihua Lei Zhangqi Geng Kaitao Huang Jiancong Chen Fuchun Huang Huajie Feng Xihong Lu Guangdong Industry Polytechnic College Guangzhou 510300GuangdongChina MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy ChemistrySchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Hainan Normal UniversityHaikou 571158HainanChina

Aqueous zinc ion battery(ZIB)with many virtues such as high safety,cost-effective,and good environmental compatibility is a large-scale energy storage technology with great application potential.Nevertheless,its application is severely hindered by the slow diffusion of zinc ions in desirable cathode materials.Herein,a technique of water-incorporation coupled with oxygen-vacancy modulation is exploited to improve the zinc ions diffusion kinetics in vanadium pentoxide(V_(2)O_5)cathode for ZIB.The incorporated water molecules replace lattice oxygen in V_(2)O_5,and function as pillars to expand interlayer distance.So the structural stability can be enhanced,and the zinc ions diffusion kinetics might also be promoted during the repeated intercalation/deintercalation.Meanwhile,the lattice water molecules can effectively enhance conductivity due to the electronic density modulation effect.Consequently,the modulated V_(2)O_5(H-V_(2)O_5)cathode behaves with superior rate capacity and stable durability,achieving 234 mA h g^(-1)over 9000 cycles even at 20 A g^(-1).Furthermore,a flexible all-solid-state(ASS)ZIB has been constructed,exhibiting an admirable energy density of 196.6 Wh kg^(-1)and impressive power density of 20.4 kW kg^(-1)as well as excellent long-term lifespan.Importantly,the assembled flexible ASS ZIB would be able to work in a large temperature span(from-20 to 70℃).Additionally,we also uncover the energy storage mechanism of the H-V_(2)O_5 electrode,offering a novel approach for creating high-kinetics cathodes for multivalent ion storage.

关键词： Interlayer engineering Water intercalation Vanadium pentoxide Ion diffusion kinetics Zinc ion battery

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High rate and ultralong life flexible all-solid-state zinc ion battery based on electron density modulated NiCo_(2)O_(4) nanosheets

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Journal of Energy Chemistry 2022年第7期31卷 283-291,I0008页

作者： Wenda Qiu Yunlei Tian Zhenchao Lin Shuting Lin Zhangqi Geng Kaitao Huang Aihua Lei Fuchun Huang Huajie Feng Fengze Ding Yu Li Xihong Lu Guangdong Industry Polytechnic College Guangzhou 510300GuangdongChina MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy ChemistrySchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Hainan Normal UniversityHaikou 571158HainanChina

The development of zinc ion batteries (ZIBs) with large capacity,high rate,and durable cathode material is a crucial and urgent task.Ni Co_(2)O_(4)(NCO) has received ever-growing interest as a potential cathode material for ZIBs,owing to the high theoretical capacity,rich source,cost-effective,and versatile redox nature.However,due to the slow dynamics of the NCO electrodes,its practical application in highperformance systems is severely limited.Herein,we report an electron density modulated NCO nanosheets (N-NCO NSs) with high-kinetics Zn^(2+)-storage capability as an additive-free cathode for flexible all-solid-state (ASS) ZIBs.By virtue of the enhanced electronic conductivity,improved reaction kinetics,and increased active sites,the optimized N-NCO NSs electrode delivers a high capacity of 357.7 m Ah g^(-1)at 1.0 A g^(-1)and a superior rate capacity of 201.4 m Ah g^(-1)at 20 A g^(-1).More importantly,a flexible ASS ZIBs device is manufactured using a solid polymer electrolyte of a poly (vinylidene fluoride hexafluoropropylene)(PVDF-HFP) film.The flexible ASS ZIBs device shows superb durability with 80.2%capacity retention after 20,000 cycles and works well in the range of-20–70℃.Furthermore,the flexible ASS ZIBs achieves an impressive energy density as high as 578.1 W h kg^(-1)with a peak power density of 33.6 k W kg^(-1),substantially outperforming those latest ZIBs.This work could provide valuable insights for constructing high-kinetics and high-capability cathodes with long-term stability for flexible ASS ZIBs.

关键词： Electron densities modulation NiCo_(2)O_(4)nanosheets All-solid-state Flexible Zinc ion batteries

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Constitutive modelling of idealised granular materials using machine learning method

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 1038-1051页

作者： Mengmeng Wu zhangqi Xia Jianfeng Wang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Shenzhen Research Institute of City University of Hong Kong ShenzhenChina

Predicting the constitutive response of granular soils is a fundamental goal in geomechanics.This paper presents a machine learning(ML)framework for the prediction of the stress-strain behaviour and shearinduced contact fabric evolution of an idealised granular material subject to triaxial shearing.The MLbased framework is comprised of a set of mini-triaxial tests which provide a benchmark for the setup and validation of the discrete element method(DEM)model of the granular materials,a parametric DEM simulation programme of virtual triaxial tests which provides datasets of micro-and macro-mechanical information,as well as a multi-layer perceptron(MLP)neural network which is trained and tested using the DEM-based datasets.The ML model only requires the initial void ratio of the granular sample as the input for predicting its constitutive response.The excellent agreement between the ML model prediction and experimental test and DEM simulation results indicates that the MLebased modelling approach is capable of capturing accurately the effects of initial void ratio on the constitutive behaviour of idealised granular materials,bypassing the need to incorporate the complex micromechanics underlying the macroscopic mechanical behaviour of granular materials.Lastly,a detailed comparison between the used MLP model and long short-term memory(LSTM)model was made from the perspective of technical algorithm,prediction accuracy,and computational efficiency.

关键词： Machine learning(ML) Multi-layer perceptron(MLP) Contact fabric Granular material Discrete element method(DEM)

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Why quantum adiabatic computation and D-Wave computers are so attractive?

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Science Bulletin 2017年第11期62卷 741-742页

作者： zhangqi Yin Zhaohui Wei Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua University Centre for Quantum Technologies National University of Singapore School of Physical and Mathematical Sciences Nanyang Technological University

Because of the possibility that improves our computational capability dramatically,in the past two decades quantum computation has been attracting more and more attentions.Particularly,in recent years remarkable progresses have been made for theoretical researches and experimental implementations in this area,which will probably bring us quantum computer able to beat

关键词：量子计算机绝热计算吸引力计算能力实验实现

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钢管塔结构强度的有限元分析及试验研究

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华北电力大学学报（自然科学版） 2020年第5期47卷 102-110页

作者：王孟耿景都苏志钢王璋奇华北电力大学能源动力与机械工程学院河北保定071003 中国电力科学研究院北京102401

研究了特高压钢管塔的主材、斜材、横隔材及辅助材等的受力特点,将特高压钢管塔简化成桁梁混合有限元建模,分析了钢管塔结构有限元建模原则和方法。建立了某1000 kV特高压钢管塔的桁梁混合有限元模型,通过施加特定载荷工况,验证了所建... 详细信息

研究了特高压钢管塔的主材、斜材、横隔材及辅助材等的受力特点,将特高压钢管塔简化成桁梁混合有限元建模,分析了钢管塔结构有限元建模原则和方法。建立了某1000 kV特高压钢管塔的桁梁混合有限元模型,通过施加特定载荷工况,验证了所建有限元模型的合理性。分析计算了大风工况、覆冰组合工况等典型加载工况下的钢管塔载荷-变形规律,得到特高压钢管塔关键受力塔材的应力及重要节点的位移等随试验加载的变化规律,并将模型的计算结果与该塔的真型塔实验结果进行了对比分析。结果表明,所建立的特高压钢管塔的桁梁混合模型是有效的,模型计算结果和真型塔的实验结果符合很好。

关键词：特高压钢管塔真型试验有限元分析

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High thermal conductivity of graphene and structure defects:Prospects for thermal applications in graphene sheets

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Chinese Chemical Letters 2021年第4期32卷 1293-1298页

作者： Chenglong Cai Ting Wang Guanwen Qu zhangqi Feng State Key Laboratory of Bioelectronics National Demonstration Centre for Experimental Biomedical Engineering EducationSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Southeast University Jiangbei New Area Innovation Institute Nanjing 210096China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The utilization of thermal energy from different sources is an important development direction for conserving energy.With the development of technology,refined and rapid utilization of thermal energy is required.Traditional thermal conductive materials cannot meet the growing needs of human beings.Therefore,people pay attention to two-dimensional graphene film materials for their thermal conductivity.This review collects current modeling group of thermal transport on graphene,including non-equilibrium Green function(NEGF)theory,molecular dynamics(MD)simulations modeling and Boltzmann transport equation method.These models can well explain several phenomena of phonon transport in graphene.Furthe r,structural de fects were discussed and expounded the effect for graphene thermal conductivity,including doping,grain bounda ry and defects.Deeply understanding of defects on graphene,we can better grasp the thermal conductivity of graphene from the microscopic point of view.

关键词： Graphene Phonon Thermal transport Modeling Two-dimensional

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反馈压缩冷却光力学振子突破精度极限

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中国科学：物理学、力学、天文学 2024年第2期54卷 146-148页

作者：尹璋琦北京理工大学物理学院量子技术研究中心先进光电量子结构设计与测量教育部重点实验室北京100081

近年来光力学反馈冷却技术对于提升光力学的测量精度以及实现宏观量子叠加均发挥了重要的推动作用.但是传统测量反馈冷却技术受限于测量噪声.最近的研究结合并同时优化了矢量探测反馈冷却与参量压缩技术,不仅突破了传统反馈冷却技术的极... 详细信息

近年来光力学反馈冷却技术对于提升光力学的测量精度以及实现宏观量子叠加均发挥了重要的推动作用.但是传统测量反馈冷却技术受限于测量噪声.最近的研究结合并同时优化了矢量探测反馈冷却与参量压缩技术,不仅突破了传统反馈冷却技术的极限,也突破了参量压缩的3 d B极限,实现了超过30 d B的热噪声抑制.

关键词：光力学压缩态反馈冷却

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In situ wound sprayable double-network hydrogel: Preparation and characterization

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Chinese Chemical Letters 2022年第4期33卷 1963-1969页

作者： Chenglong Cai Ting Wang Xu Han Shaoqiang Yang Chengteng Lai Tao Yuan zhangqi Feng Nongyue He State Key Laboratory of Bioelectronics National Demonstration Centre for Experimental Biomedical Engineering EducationSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Southeast University Jiangbei New Area Innovation Institute Nanjing 210096China Nanjing Jinling Hosp Dept OrthopedNanjing 210002China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China

In clinical settings the wound-dressing was required easy to use and can match the wound area immediately, at the same time they need to have the properties of hemostats, anti-inflammation and promoting wound healing. To get an ideal wound dressing, we developed a type of gel-like wound adhesive patch from spraying double-network hydrogel, which own the properties of self-antibacterial and can promote wound healing. By spraying, the gel-like wound adhesive patch can match the wound area immediately and form a gel-film in 10 s. Sodium carboxymethyl cellulose as p H sensitive materials accelerated the speed to form the gel-film and enhanced ductility of the wound adhesive patch. In vitro experiments show that, this gel-like wound adhesive patch can promote cell proliferation and reduce cell apoptosis.In vivo studies show that, compared with commercialized wound dressings in clinic using, the spraying gel-like wound adhesive patch from our work has a better effect on wound healing. In conclusion, the spraying gel-like wound patch in our work is easy to use and can form a gel-film match on wound area in a short time, also it has the properties of hemostats, anti-inflammation and promoting wound healing.Its feasibility for mass production shows a good potential for commercial use.

关键词： Hydrogel Sodium alginate Chitosan Spray method Sodium carboxymethyl cellulose

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APM线路不中断运营桥梁支座更换技术

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城市轨道交通研究 2022年第S01期25卷 106-109页

作者：蒋章琪上海申凯公共交通运营管理有限公司上海200070

目前,国内尚无APM(旅客自动运输)线路桥梁支座更换施工案例。地铁等钢轮钢轨城市轨道交通线路不中断运营桥梁支座更换技术较为成熟,但APM线路为胶轮导轨,其上部设施有其特殊性,不能完全采用地铁等的施工技术。以上海轨道交通浦江线为实... 详细信息

目前,国内尚无APM(旅客自动运输)线路桥梁支座更换施工案例。地铁等钢轮钢轨城市轨道交通线路不中断运营桥梁支座更换技术较为成熟,但APM线路为胶轮导轨,其上部设施有其特殊性,不能完全采用地铁等的施工技术。以上海轨道交通浦江线为实际案例,分析了APM线路桥梁病害治理的难点,介绍了不中断运营情况下桥梁支座更换的施工技术。实测数据表明,该施工技术对APM线路上部轨旁等重要设施设备影响小,施工期间不影响线路正常运营。

关键词：城市轨道交通 APM 桥梁病害治理支座更换

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Randomized difference-based gradient-free algorithm for distributed resource allocation

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Science China(Information Sciences) 2022年第4期65卷 212-228页

作者： Xiaoxue geng Wenxiao ZHAO Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences

This paper considers a distributed resource allocation problem over time-varying networks. The objective of each agent in the network is to optimize the sum of separable convex functions subjected to resource constraints by observing its local objective function and the information exchanged with its adjacent neighbors. Thus, the problem lies in a distributed framework. In existing literature dealing with similar problems, the measurement of the gradients/subgradients of the objective functions has been applied in the algorithm design. In this paper, by adding stochastic dithers to the local objective functions and constructing randomized differences, we propose a distributed gradient-free algorithm for solving the problem, and show that the algorithm is strongly convergent; that is, the estimates generated from each agent almost certainly converge to the optimal resource allocation solution of the network. Finally, the effectiveness of the algorithm is validated by conducting numerical experiments.

关键词： resource allocation distributed algorithm randomized difference

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