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Pd cluster decorated free standing flexible cathode for high performance Li-oxygen batteries

Nano Research 2024年第4期17卷 2678-2686页

作者： Liang Guo Guoliang Zhang Ruonan Yang Dongmei Zhang Xiuqi Zhang Han Yu Xia Li feng dang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

As a promising candidate for the next generation energy storage system,rechargeable lithium-oxygen batteries(LOBs)still face substantial challenges caused by insulating discharge products that preclude their practical *** highly efficient cathode catalysts capable of facilitating formation/decomposition of discharge products is considered as an essential approach towards high performance ***,Pd decorated Te nanowires(Pd@Te NWs)were synthesized as advanced catalyst in LOBs to maximize Pd utilization and achieve synergistic effect,in which Pd clusters were uniformly grown on Te substrate though regulating the Pd:Te ***,Pd@Te nanowires assembled into an interpenetrating network-like structure by vacuum filtration and employed as flexible cathode,enabling LOBs achieved an ultralong 190 cycles stability and a superior specific capacity of 3.35 mAh·cm^(-2).Experimental studies and density functional theory(DFT)calculations reveal the excellent catalytic ability of Pd@Te and synergistic catalytic mechanism of Pd and Te,in which uniform electron distribution,extensive electron exchange,and large adsorption distance between Pd cluster and discharge products promote homogeneous adsorption/desorption of discharge products,while the high adsorption energy of Te substrate for Li species reduces the initial dynamical energy barrier during discharging *** current work provides viable strategy to design composite catalysts for flexible cathode of LOBs with synergistic catalytic effects.

关键词： flexible lithium-oxygen batteries Pd@Te synergistic catalysis cathode catalysts density functional theory(DFT)calculation

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Construction of MnS/MoS_(2) heterostructure on two-dimensional MoS_(2) surface to regulate the reaction pathways for high-performance Li-O_(2) batteries

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Journal of Energy Chemistry 2024年第6期93卷 443-452,I0012页

作者： Guoliang Zhang Han Yu Xia Li Xiuqi Zhang Chuanxin Hou Shuhui Sun Yong Du Zhanhu Guo feng dang Key Laboratory for Liquid-Solid Structure Evolution and.Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061ShandongChina School of Environmental and Material Engineering Yantai UniversityYantai 264005ShandongChina Institute National de la Recherche Scientifique CentreÉnergie Matériaux et TélécommunicationsVarennesQuébec J31S2Canada State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK

The inherent catalytic anisotropy of two-dimensional(2D) materials has limited the enhancement of LiO_(2) batteries(LOBs) performance due to the significantly different adsorption energies on 2D and edge *** the adsorption strength in 2D materials to the reaction intermediates is essential for achieving high-performance ***,a MnS/MoS_(2) heterostructure is designed as a cathode catalyst by adjusting the adsorption behavior at the *** from the toroidal-like discharge products on the MoS_(2) cathode,the MnS/MoS_(2) surface displays an improved adsorption energy to reaction species,thereby promoting the growth of the film-like discharge *** can disturb the layer growth of MoS_(2),in which the stack edge plane features a strong interaction with the intermediates and limits the growth of the discharge *** and theoretical results confirm that the MnS/MoS_(2) heterostructure possesses improved electron transfer kinetics at the interface and plays an important role in the adsorption process for reaction species,which finally affects the morphology of Li_2O_(2),In consequence,the MnS/MoS_(2) heterostructure exhibits a high specific capacity of 11696.0 mA h g^(-1) and good cycle stability over 1800 h with a fixed specific capacity of 600 mA h g^(-1) at current density of100 mA g^(-1) This work provides a novel interfacial engineering strategy to enhance the performance of LOBs by tuning the adsorption properties of 2D materials.

关键词： Li-O_(2)batteries Two-dimensional materials MnS/MoS_(2)heterostructure Edge plane Adsorption behavior

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高超声速火箭橇凿削磨损机理分析

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西安交通大学学报 2024年第8期58卷 136-144页

作者：陈科儒孙琨陈诚齐博毅党峰西安交通大学金属材料强度国家重点实验室西安710049 中国兵器工业试验测试研究院西华阴714200陕西安交通大学航天航空学院西安710049

针对高超声速下火箭橇运行过程中凿削磨损产生的机理模糊不清问题,基于有限元-光滑粒子流体动力学法(FEM-SPH法),利用有限元软件ABAQUS构建了三维火箭橇靴-轨模型,FEM-SPH法是一种既能保证计算精度,又能克服网格畸变的新型模拟方法。在... 详细信息

针对高超声速下火箭橇运行过程中凿削磨损产生的机理模糊不清问题,基于有限元-光滑粒子流体动力学法(FEM-SPH法),利用有限元软件ABAQUS构建了三维火箭橇靴-轨模型,FEM-SPH法是一种既能保证计算精度,又能克服网格畸变的新型模拟方法。在该模型中,滑靴和轨道所使用的材料分别为VascoMax 300钢、AISI 1080钢,并赋予各自材料属性,通过设定航向速度为2000 m/s,竖直速度为2.5 m/s以及温度为673 K,模拟了高超声速下靴-轨凿削磨损现象的演变过程。模拟结果表明:凿削磨损是在高温高应力作用下和靴-轨之间形成嵌入式结构后,经过持续地破坏滑靴底部所产生的,最终形成泪滴状蚀坑。进一步分析表明,竖直速度和温度的增加都会提高凿削发生的概率。在航向速度为2000 m/s、初始温度为673 K时,竖直速度超过1.50 m/s就会发生凿削现象;在航向速度为2000 m/s、竖直速度为2.5 m/s,温度超过293 K就会发生凿削现象。该研究成果不仅有助于高超声速下靴-轨凿削磨损的产生机理进一步完善,还为高超声速火箭橇试验的安全发射提供了新的理论支持。

关键词：火箭橇试验凿削现象有限元-光滑粒子流体动力学法竖直速度温度

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壳聚糖衍生碳包覆纳米硅复合材料锂离子电池性能研究

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材料导报 2024年第10期38卷 12-17页

作者：吴强李正伟周建华张冬梅党锋刘文平苗蕾桂林电子科技大学材料科学与工程学院广西电子信息材料构效关系重点实验室山东大学材料科学与工程学院中国有色桂林矿产地质研究院有限公司国家特种矿物材料工程技术研究中心广西超硬材料重点实验室

硅负极材料因具有较高的理论容量(Li22Si5合金相对应4 200 mAh/g)、较低的工作电压（0.2～0.3 V vs Li/Li+）和地球上丰富的原材料储备，成为代替石墨负极的理想材料之一。但是，低电导率及在循环过程中发生剧烈体积膨胀导致电极失效问... 详细信息

硅负极材料因具有较高的理论容量(Li22Si5合金相对应4 200 mAh/g)、较低的工作电压（0.2～0.3 V vs Li/Li+）和地球上丰富的原材料储备，成为代替石墨负极的理想材料之一。但是，低电导率及在循环过程中发生剧烈体积膨胀导致电极失效问题限制了硅负极材料的进一步发展。因此，本工作通过物理法利用壳聚糖和石墨对纳米硅实现碳包覆和复合，制备壳聚糖/石墨@纳米硅复合材料（C/G@Si复合材料）,对C/G@Si复合材料的结构、形貌和电化学性能进行研究。结果表明：随着石墨添加量的提高，C/G@Si复合材料的可逆比容量略微下降，循环性能和导电性能显著提高。当添加50%（质量分数）石墨时，在100 mA/g的电流密度下，C/G@Si复合材料的首次放电比容量为1 136.1 mAh/g,循环充放电100次后剩余容量保持在658.5 mAh/g,展示出优异的电化学性能，对进一步推广硅碳负极材料具有一定的参考价值。

关键词：锂离子电池硅碳负极材料壳聚糖石墨掺杂

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含水量对膨胀土高填方渠堤土体剪切特性的影响研究

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中国农村水利水电 2024年第4期 152-157,164页

作者：冯党王闯常兆广贾旺刘达中国南水北调集团中线有限公司渠首分公司河南南阳473000 华北水利水电大学河南郑州450046 江西省水利科学院江西南昌330029

通过不同含水量下南水北调中线工程高填方渠堤的改性土、膨胀土和渠基土的直剪试验,研究含水量对3种土体剪应力-剪切位移以及抗剪强度的影响规律。结果表明:3种土体的基质吸力随着含水量增加而显著减小;当含水量较低时,剪应力-剪切位移... 详细信息

通过不同含水量下南水北调中线工程高填方渠堤的改性土、膨胀土和渠基土的直剪试验,研究含水量对3种土体剪应力-剪切位移以及抗剪强度的影响规律。结果表明:3种土体的基质吸力随着含水量增加而显著减小;当含水量较低时,剪应力-剪切位移曲线呈剪切软化型;而随含水量的增加,剪应力-剪切位移曲线转化为剪切硬化型。不同土体的抗剪强度随含水量增加均呈现先增大后减小的变化规律,且含水量达到土体的塑性含水量以后,抗剪强度降低较小。含水量对改性土、回填膨胀土和渠基土的黏聚力及内摩擦角存在着显著影响,黏聚力与含水量满足二次多项式关系;土体的内摩擦角随着土体含水量的增加呈现出非线性减小的变化规律,且渠堤改性土内摩擦角随含水量的降低幅度较渠堤膨胀土和渠基土大。

关键词：高填方渠堤含水量抗剪强度剪应力-剪切位移关系直剪试验

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Abscisic acid-dependent PMT1 expression regulates salt tolerance by alleviating abscisic acid-mediated reactive oxygen species production in Arabidopsis

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Journal of Integrative Plant Biology 2022年第9期64卷 1803-1820页

作者： Qi Yu He Jian feng Jin He Qiang Lou feng feng dang Ji Ming Xu Shao Jian Zheng Jian Li Yang State Key Laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang UniversityHangzhou310058 China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou311300 China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou510642 China

Phosphocholine(PCho)is an intermediate metabolite of nonplastid plant membranes that is essential for salt ***,how PCho metabolism modulates response to salt stress remains ***,we characterize the role of phosphoethanolamine N-methyltransferase 1(PMT1)in salt stress tolerance in Arabidopsis thaliana using a T-DNA insertional mutant,geneediting alleles,and complemented *** pmt1 mutants showed a severe inhibition of root elongation when exposed to salt stress,but exogenous ChoCl or lecithin rescued this ***1 also displayed altered glycerolipid metabolism under salt stress,suggesting that glycerolipids contribute to salt ***,pmt1 mutants exhibited altered reactive oxygen species(ROS)accumulation and distribution,reduced cell division activity,and disturbed auxin distribution in the primary root compared with wild-type *** show that PMT1 expression is induced by salt stress and relies on the abscisic acid(ABA)signaling pathway,as this induction was abolished in the aba2-1 and pyl112458 ***,ABA aggravated the salt sensitivity of the pmt1 mutants by perturbing ROS distribution in the root *** together,we propose that PMT1 is an important phosphoethanolamine N-methyltransferase participating in root development of primary root elongation under salt stress conditions by balancing ROS production and distribution through ABA signaling.

关键词： abscisic acid(ABA) oxidative stress plasma membrane phosphoethanolamine N-methyltransferase phospholipid metabolism salt stress

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基于BIM和GIS的超前地质预报可视化方法

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地质灾害与环境保护 2024年第2期35卷 123-128页

作者：杨党锋王宇昀庞琦许墨陶西安理工大学水利水电学院西安710048 中国电建集团西北勘测设计研究院有限公司西安710065 同济大学土木工程学院上海200092

当前超前地质预报通常采用书面报告的形式呈现,直观性差,信息获取效率低。为了解决这一问题,提出了一种基于BIM和GIS的超前地质预报可视化方法。该方法以GIS和BIM模型为载体,结合现场施工进度数据,将超前地质预报数据在二维和三维视图... 详细信息

当前超前地质预报通常采用书面报告的形式呈现,直观性差,信息获取效率低。为了解决这一问题,提出了一种基于BIM和GIS的超前地质预报可视化方法。该方法以GIS和BIM模型为载体,结合现场施工进度数据,将超前地质预报数据在二维和三维视图中进行动态表达,提高了获取超前地质预报信息的效率。根据该方法基于微服务的基本框架,开发了超前地质预报可视化系统,该系统多角度、全方位地展示超前地质预报信息,可有效地辅助现场施工,保障施工安全。

关键词：地下工程 BIM GIS 超前地质预报可视化

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南水北调中线工程运行期膨胀土长期变形及稳定性分析

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水利水电快报 2024年第7期45卷 29-34页

作者：冯党吴庚张一楠何宜霖熊勇何佳林中国南水北调集团中线有限公司渠首分公司河南南阳473000 长江科学院水利部岩土力学与工程重点实验室湖北武汉430010

南水北调中线工程运行数年后,部分膨胀土边坡渠段出现了长期变形问题。为掌握膨胀土渠坡长期变形规律,利用南水北调中线膨胀土边坡运行期长期监测资料,分析了膨胀土渠坡深层变形的长期发展特征及其与降雨的关系,揭示了膨胀土边坡深层位... 详细信息

南水北调中线工程运行数年后,部分膨胀土边坡渠段出现了长期变形问题。为掌握膨胀土渠坡长期变形规律,利用南水北调中线膨胀土边坡运行期长期监测资料,分析了膨胀土渠坡深层变形的长期发展特征及其与降雨的关系,揭示了膨胀土边坡深层位移长期发展的内在机理。借鉴土力学流变原理中剪切蠕变的负幂时间函数,分析了幂指数与蠕变衰减速率之间的关系,确定了边坡长期变形收敛与发散的判别阈值,提出了用于深挖方膨胀土边坡长期稳定状态的幂次判别法。选取典型膨胀土深挖方边坡,基于实测数据开展膨胀土边坡长期稳定状态评价。与后续实际运行状态对比表明,幂次判别法具有有效性。研究成果为膨胀土边坡稳定状态评价和运行维护提供理论与技术支撑。

关键词：膨胀土长期变形幂次判别法南水北调中线工程

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Microstructure and Mechanical Behavior of Mg-Based Bimetal Plates with High Formability Sleeve by Co-extrusion

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 499-512页

作者： Yue-Hui dang Sheng-Lin Liu Xiao-Lei Ai Xiao-Wei feng Bo feng Zhuo Tian Ying-Fei Lin Huan-Tao Chen Kai-Hong Zheng School of Materials Science and Engineering Chang’an UniversityShaanxi 710064China Guangdong Key Laboratory of Metal Toughening Technology and Application Institute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China

In this study,microstructure and mechanical behavior of two types of Mg-based bimetal plates with a high formability sleeve were systematically studied,with a great emphasis on the effect of the interface characteristic and the sleeve fraction on the plasticity of composite *** rule of mixtures(ROM)for elongation was also *** results show that when there is no or thin diffusion layer with thickness of about 3μm,Mg-based bimetal plates have a good plasticity with elongation of about 19-24%,and the ROM predicted elongations are very close to the experimental *** contrast,with a diffusion layer about 95-155μm thick,Mg-based bimetal plates exhibit a poor plasticity with elongation of about 11-17%,and the experimental elongations largely deviate from the ROM *** plasticity of Mg-based bimetal plates increases with increasing sleeve *** study provides new insights on the plastic deformation of Mg-based bimetal composites with a high formability sleeve.

关键词： Mg-based composites Co-extrusion Microstructure Mechanical behavior Plastic deformation

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Effect of heat treatment on microstructural evolution,mechanical properties and tribological properties of H13 steel prepared using selective laser melting

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1246-1259页

作者： Li-xiong Han Yan Wang Shi-feng Liu Zhao-hui Zhang Wei Liu Xin Yang dang-shen Ma Jian Zhou Ying-kang Wei College of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Zhejiang University City College Hangzhou310015ZhejiangChina China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China

H13 tool steel was successfully prepared by selective laser melting(SLM)*** effects of heat treatment on the microstructure,mechanical properties,and tribological properties of SLMed H13 steel were *** heat treatment process involved a solution treatment and a double aging treatment of the deposited H13 tool steel prepared by *** aim is to optimize the microstructure and mechanical properties of SLMed H13 *** to the rapid heating and cooling effects of SLM,carbide precipitation in the deposited H13 steel was not uniform and residual stresses were *** purpose of the solution treatment is to dissolve the solution at a high temperature to eliminate the residual stresses and defects introduced by the SLM-forming *** solution treatment and first aging treatment produced the precipitation of small carbides at the grain boundaries and inside the crystals,which increased the hardness of SLMed H13 *** hardness increased from 538±4.0 HV of the as-deposited sample to 548±5.8 HV of samples after the first aging ***,the ultimate tensile strength and the elongation at break decreased from 1882 MPa and 11.5%in the as-deposited sample to 1697 MPa and 7.9%in those after the first aging treatment,***,the friction coefficient and wear rate in the as-deposited sample decreased from 0.5160 and 2.36×10^(–6)mm^(−3)N^(−1)m^(−1)to 0.4244 and 1.04×10^(–6)mm^(−3)N^(−1)m^(−1),***,the distribution of carbides inside the crystals was not *** second aging treatment adjusted the morphology of carbide precipitation and made it more uniform,but the precipitation of carbides grew and settled at the bottom of the grain *** hardness decreased to 533±6.7 HV compared with that with the first aging treatment,but the ultimate tensile strength and plasticity reached a balance(1807 MPa,14.05%).Accordingly,the friction coefficient and wear rate also showed a stable and decreasin

关键词： Selective laser melting H13 steel Solution aging Double aging Friction and wear Retained austenite

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