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Octylamine-Supporting Interlayer Expanded Molybdenum Diselenide as a High-power Cathode for Rechargeable Mg batteries

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Energy & Environmental Materials 2023年第6期6卷 191-198页

作者： Dong Chen xin Ren Ting li Zhongxue Chen Yu liang Cao Fei Xu key laboratory of Hydraulic Machinery transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072China key laboratory of Catalysis and Materials science of the State Ethnic Affairs Commission&Ministry of Education College of Chemistry and Materials ScienceSouth-Central University for NationalitiesWuhan 430074China Hubei key Lab of Electrochemical power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072China

Rechargeable Mg batteries(RMbs)are a promising large-scale energy-storage technology with low cost and high safety,but the performance is limited by the inferior kinetics of Mg-intercalation *** the present study,an octylamine-supporting interlayer expanded molybdenum diselenide(e-MoSe_(2))is synthesized and used as cathode for RMbs,in comparison with ordinary crystalline MoSe_(2).The octylamine molecules introduced show a strong interaction with the MoSe_(2)layers and increase the layer spacing significantly from 6.46 to 11.5Å.e-MoSe_(2)shows a high Mg-storage capacity of 238 mAh g^(-1)at 50 mA g^(-1)and a superior rate performance of 39 mAh g^(-1)at 10 A g1,far advantageous over crystalline MoSe_(2).e-MoSe_(2)also shows a considerably high structure stability during repeated magnesiation/demagnesiation,providing an outstanding cycling stability for 1000 *** electrochemical tests demonstrate the high Mg^(2+)diffusion coefficients in e-MoSe_(2).Theoretical computation indicates the interlayer expansion changes the Mg^(2+)diffusion paths from"hollow site→hollow site"to"hollow site→Se atom site→hollow site",largely decreasing the energy barrier and improving the Mg^(2+)diffusion *** present work highlights an efficient strategy for the improvement of Mg-storage performance for RMb cathodes.

关键词： batteries electrodes nanomaterials

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地下水库真实水压环境下坝体试件力学响应与破坏特征

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岩石力学与工程学报 2024年第9期43卷 2214-2224页

作者：吕鑫何祥杨科方珏静张寨男安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室安徽淮南232001 合肥综合性国家科学中心能源研究院(安徽省能源实验室) 安徽合肥230031 阿德莱德大学土木、环境和采矿工程学院澳大利亚阿德莱德5005

地下水库坝体在水压环境下的稳定性是废弃矿井抽水蓄能电站长期安全运行的关键。针对地下水库真实水压环境,自主设计、研制伺服轴-水压联合试验装置,分析环境水影响方式,阐明轴-水压联合作用结构演化过程,判断坝体理论强度变化趋势,开... 详细信息

地下水库坝体在水压环境下的稳定性是废弃矿井抽水蓄能电站长期安全运行的关键。针对地下水库真实水压环境,自主设计、研制伺服轴-水压联合试验装置,分析环境水影响方式,阐明轴-水压联合作用结构演化过程,判断坝体理论强度变化趋势,开展不同水压力环境坝体力学试验,确定水压对坝体试件力学性能影响规律,探讨细观断口形貌特征与宏观破坏形态。结果表明:真实水压环境对坝体试件产生水化学与水压力影响,涵盖7个方面的增强与弱化作用;试件水环境由外界围压水、贯通孔隙水、封闭孔隙水3个部分组成,在试件饱和及加载过程中水介质交互与裂纹扩展相互影响,水压力越大渗入量与影响越大;真实水压环境改变试件损伤量与有效孔隙,进而影响侧向有效应力与试件强度;随着真实水压环境的水压力增大,应力-应变曲线具有明显的屈服波动、强度先减小后增大、轴向应变则持续降低,试验机对试件的耗能逐渐减少,但耗散能占比增速加快;水压力增大后断口形貌处裂纹核数量减少,主裂纹依次为沿晶断裂-穿晶断裂-剪切破坏,细微裂纹数量增大,试件破坏形态经历张拉-张剪-剪切转变,且破坏愈加复杂,伴随崩脆声响。研究成果可提高地下水库监测评估准确性,并为废弃矿井抽水蓄能电站建设提供理论与试验依据。

关键词：采矿工程废弃矿井地下水库坝体试件真实水压环境破裂断口水压破坏机制

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A promising method to recover spent V_(2)O_(5)-WO_(3)/TiO_(2) catalyst: treatment by vanadium-titanium magnetite sintering process

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Journal of Iron and Steel Research International 2022年第8期29卷 1176-1184页

作者： Hong-ming Long Yu-dong Zhang Tao Yang li-xin Qian Zheng-wei Yu school of Metallurgical engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina Anhui Province key laboratory of Metallurgy engineering and Resources Recycling Anhui University of TechnologyMa’anshan 243002AnhuiChina

A large number of spent selective catalytic reduction(SCR)denitration catalysts are produced after the ultra-low emission transformation of coal-fired power plants in *** to the china’s“Directory of national Hazardous Wastes(Version 2021)”,these spent vanadium-tungsten-titanium catalysts are classified as“HW50”hazardous waste,and their disposal and utilization processes have been strictly ***,an effective and low-cost technique was developed to treat and utilize these spent SCR catalysts by the vanadium-titanium magnetite sintering *** of adding spent SCR catalysts on the sintering production process and product quality indexes of sinter were *** results showed that adding spent SCR catalysts can improve the sintering granulation and green feed permeability,thereby increasing the productivity and flame front *** the addition proportion of spent SCR catalysts is less than 1 wt.%,the performance indexes of the finished sinter are basically equal to those of the finished sinter without adding spent SCR *** increasing the proportion of spent SCR catalysts to 2.0 wt.%results in a decrease in product quality indexes,which could be attributed to the increase in perovskite content in the finished sinter.

关键词： Spent selective catalytic reduction catalyst Hazardous waste Vanadium-titanium magnetite sintering Recovery Utilization

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Evaluating effectiveness of multiple tuned mass dampers for vibration control of jacket offshore wind turbines under onshore and seafloor earthquakes

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Earthquake engineering and engineering Vibration 2023年第4期22卷 1045-1063页

作者： Pan Zuxing liu Yingzhou Wang Wenhua li xin Zhao Shengxiao Jiang Zhenqiang Shang Jin Renewable Energy engineering Institute Power China Huadong Engineering Corporation LimitedHangzhou 311122China State key laboratory of Coastal and Offshore engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China Institute of Earthquake engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China school of Civil engineering and Architecture Guangxi University for NationalitiesNanning 530006China

The dynamic characteristics and structural responses of operation and grid loss offshore wind turbines(OWTs)under onshore and seafloor earthquakes are analyzed based on the established coupled seismic analysis *** addition to the remarkable influence of the rotor system on the responses of the operation OWT under earthquakes,interactions among the natural modes of the grid loss OWT in the fore-aft and side-to-side directions are *** comparing with the onshore earthquakes,the more significant differences of structural response are observed under the selected seafloor earthquakes,due to the longer duration and more abundant energy distribution around the natural frequencies of ***,a multiple tuned mass damper(MTMD)is designed and applied to the operation and grid loss ***,the comparisons of the mitigation effects under onshore and seafloor ground motions are carried out,and the necessity of applying seafloor ground motions to OWTs are ***,in comparison to the operation OWT,more effective reductions are observed for the grid loss OWT under onshore and seafloor earthquakes using the designed ***,the combined shutdown procedures and MTMD vibration control strategy is suggested for OWTs under earthquakes.

关键词： offshore wind turbine earthquake vibration control coupled analysis MTMD

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Carbon nanofibers membrane bridged with graphene nanosheet and hyperbranched polymer for high-performance osmotic energy harvesting

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Nano Research 2023年第1期16卷 1205-1211页

作者： Weijie Wang Jinlin Hao Qian Sun Minqi Zhao Huiyi liu Chao li xin Sui College of Materials science and engineering Qingdao UniversityQingdao 266071China laboratory of bio-Inspired Smart Interfacial science and technology of Ministry of Education Key Laboratory of Beijing EnergySchool of Chemistry and EnvironmentBeihang UniversityBeijing 100191China

Reverse electrodialysis(RED),based on ion-selective membranes,is one of the most promising technologies for capturing osmotic *** key elements of the RED system,ion-selective membranes must meet the crucial demands of mechanical stability,anti-fouling characteristics,easy fabrication,and high power density;however,this still remains a *** this study,we demonstrated a large-scale,mechanically stable,and high-porosity membrane obtained by combining carbon nanomaterials and hyperbranched polyethyleneimine(h-PEI),thereby achieving a high power density of 5.0 W·m−2 with seawater and river *** nanofibers(CNFs)were subsequently bridged with graphene and h-PEI to strengthen the interaction between the CNFs,reduce the channel size and increase the space charge density,mechanical strength,and *** large-scale and mechanically stable membrane fabricated using the modified CNFs exhibited anion selectivity and high ionic conductivity,thereby achieving a high-performance osmotic energy ***,the anti-fouling property of the membrane was confirmed by the stability of the osmotic energy conversion in a solution with algae,which can be attributed to the high porosity of carbon *** economic and convenient method for the ion-selective membrane preparation is believed to be promising for large-scale osmotic energy harvesting.

关键词： carbon nanofibers graphene nanosheet bridged structure hyperbranched polymer osmotic energy harvesting

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A novel low-complexity power allocation algorithm based on the NOMA system in a low-speed environment

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Digital Communications and Networks 2021年第4期7卷 580-588页

作者： Guangfu Wu Wenyi Zheng Wei Xiong Yun li Hongcheng Zhuang xin Tan school of Communication and Information engineering Chongqing University of Posts and TelecommunicationsChongqing400065China Chongqing Municipal Housing Provident Fund Administration Center Chongqing401121China Chongqing key laboratory of Mobile Communications technology Chongqing University of Posts and TelecommunicationsChongqing400065China Huawei Technologies Co Ltd.Shenzhen518129China

For future wireless communication systems,power Domain Non-Orthogonal Multiple Access(PD-NOMA)using an advanced receiver has been considered as a promising radio access technology *** allocation plays an important role in the PD-NOMA system because it considerably affects the total throughput and Geometric Mean User Throughput(GMUT)***,most existing studies have not completely accounted for the computational complexity of the power allocation process when the User Terminals(UTs)move in a slow fading channel *** resolve such problems,a power allocation method is proposed to considerably reduce the search space of a Full Search power(FSP)allocation *** initial power reallocation coefficients will be set to start with former optimal values by the proposed Lemma before searching for optimal power reallocation coefficients based on total throughput *** size and correction granularity will be adjusted within a much narrower power search range while invalid power combinations may be reasonably discarded during the search *** simulation results show that the proposed power reallocation scheme can greatly reduce computational complexity while the total throughput and GMUT performance loss are not greater than 1.5%compared with the FSP algorithm.

关键词： NOMA power allocation Slow fading channel Low computational complexity

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Influence of High-Pressure Induced Lattice Dislocations and Distortions on Thermoelectric Performance of Pristine SnTe

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Chinese physics Letters 2024年第5期41卷 61-68页

作者：郑博文陈涛孙海瑞杨曼曼杨兵超陈欣张永胜刘晓兵 laboratory of High-Pressure physics and Materials science School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Advanced Research Institute of Multidisciplinary sciences Qufu Normal UniversityQufu 273165China key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State physics HFIPSChinese Academy of SciencesHefei 230031China university of science and technology of china Hefei 230026China school of Electronic engineering Huainan Normal university Huainan 232038China

As a sister compound of PbTe, SnTe possesses the environmentally friendly elements. However, the pristine SnTe compounds suffer from the high carrier concentration, the large valence band offset between the L and Σpositions and high thermal conductivity. Using high-pressure and high-temperature technology, we synthesized the pristine SnTe samples at different pressures and systemically investigated their thermoelectric *** pressure induces rich microstructures, including the high-density dislocations and lattice distortions, which serve as the strong phonon scattering centers, thereby reducing the lattice thermal conductivity. For the electrical properties, pressure reduces the harmful high carrier concentration, due to the depression of Sn ***, pressure induces the valence band convergence, reducing the energy separation between the L and Σpositions. The band convergence and suppressed carrier concentration increase the Seebeck coefficient. Thus, the power factors of pressure-sintered compounds do not deteriorate significantly under the condition of decreasing electrical conductivity. Ultimately, for a pristine SnTe compound synthesized at 5 GPa, a higher ZT value of 0.51 is achieved at 750 K, representing a 140% improvement compared to the value of 0.21 obtained using SPS. Therefore, the high-pressure and high-temperature technology is demonstrated as an effectively approach to optimize thermoelectric performance.

关键词： coefficient properties positions

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Temperature-dependent partial discharge characteristics of high temperature materials at DC voltage for hybrid propulsion systems

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High Voltage 2021年第4期6卷 590-598页

作者： Tohid Shahsavarian xin Wu Charles Lents Di Zhang Chuanyang li Yang Cao Electrical Insulation Research Center Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA Electrical and Computer engineering University of ConnecticutStorrsConnecticutUSA Raytheon Technologies Research Center Raytheon TechnologiesEast HartfordConnecticutUSA Naval Postgraduate school MontereyCaliforniaUSA

The safe and reliable operation of insulation material used in key high voltage compo-nents under extreme environmental conditions represents the major concerns for man-ufacturers and operators of More Electric Aircrafts(MEA).Surface discharge occurring in high current carrying components in DC power system diminishes the insulation material’s performance and life,especially at high-temperature ***,the surface discharge behaviour of two commonly used high-temperature insulation materials,ethylene-tetrafluoroethylene(ETFE)and polyetheretherketone(PEEK)is studied at different temperatures under ramp and DC *** partial discharge(PD)features are presented and the impact of voltage polarity on surface discharge propagation is *** studies reveal that,while both materials exhibit non-linear PD behaviour with respect to their electrical conductivity,ETFE generally shows PDs with higher in-tensity at high temperature above 100°C with a higher possibility of surface discharge due to its lower ***,the PD mechanism in high-temperature,DC voltage applications is explored,and a basis for the selection of high-temperature PD suppressing materials is developed.

关键词： insulation high behaviour

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Single-material-substrated triboelectric–electromagnetic hybrid generator for self-powered multifunctional sensing in intelligent greenhouse

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Nano Research 2023年第2期16卷 3149-3155页

作者： baosen Zhang Wenbo li Jianwei Ge Chenggen Chen xin Yu Zhong lin Wang Tinghai Cheng beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China school of Nanoscience and technology University of Chinese Academy of SciencesBeijing 100049China school of Materials science and engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

The environmental micro-energy harvested by the triboelectric–electromagnetic hybrid generator(TEHG)can power sensors and Internet of Things(IoT)nodes in smart ***,the separation structure of traditional TEHG raises the complexity of form and material,which is harmful to the miniaturization of the ***,a single-material-substrated triboelectric–electromagnetic hybrid generator(SMS-TEHG)based on the flexible magnets is designed to achieve the structural integration of triboelectric nanogenerator(TENG)and electromagnetic generator(EMG).The flexible magnets serve as the electropositive triboelectric materials for TENG and the magnetic materials for EMG,simplifying the structural complexity of *** open-circuit voltage(VOC)of the TENG and EMG are 187.2 and 9.0 V at 300 rpm,*** 30,000 cycles of stability testing,the VOC of the TENG and EMG retain about 95.6%and 99.3%,***,the self-powered applications driven by SMS-TEHG in intelligent greenhouse have been successfully demonstrated,such as crop light supplementation,rain monitoring,and wireless temperature and humidity *** work provides a new design for TEHG and possibilities for applying TEHG and IoT in smart agriculture.

关键词： triboelectric–electromagnetic hybrid generator single-material-substrated wind energy harvesting self-powered smart agriculture

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Role of oxygen vacancy in rare-earth-free liCa_(3)Mg(VO_(4))_(3) phosphor: Enhancing photoluminescence by heat-treatment in oxygen flow

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Journal of Materials science & technology 2021年第20期79卷 123-132页

作者： Yixuan Lv Yijun Zhang Le Shi Jian-Wen Shi Jun li Zhihui li xin Ji Dandan Ma Yonghong Cheng Chunming Niu State key laboratory of Electrical Insulation and power Equipment Center of Nanomaterials for Renewable EnergySchool of Electrical EngineeringXi’an Jiaotong UniversityXi’an710049China key laboratory of Electronic Ceramics and Devices of Ministry of Education Department of Electronics and InformationXi’an Jiaotong UniversityXi’an710049China

As a kind of white light emitting diode(w-LED)with many advantages,rare-earth-free vanadate phosphor has attracted more and more *** oxygen vacancies and other surface defects in vanadate oxide have obvious effects on its structure and *** order to reveal the specific effects,we heat-treat the original liCa_(3)Mg(VO_(4))_(3)(LCMV)in an oxygen flow with different time to decrease oxygen vacancies,and find that the lattice distortion of[VO_(4)]tetrahedron caused by oxygen vacancy is effectively ***,the crystallinity of the treated samples increases,the surface defects decreases,and the fluorescence intensity *** variation of photoluminescence quantum yield(PLQY)with oxygen treatment time is as follows:the enhancement effect firstly reaches the strongest(69.34%)within one hour,then begins to decline after two hours,and finally reaches the platform after three hours and remains basically *** reason for the enhancement of PLQY is the decrease of oxygen vacancy after one-hour treatment,and the reason for the decrease of PLQY after a further increased treatment time is that the absorption of oxygen and water in air caused by excessive surface defects introduced by oxygen treatment.

关键词： Phosphor Oxygen vacancy Surface defect Rare-earth-free White light emitting diode

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