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Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

Nano Research 2024年第8期17卷 7153-7162页

作者： Yunmeng Li Yinze Zuo Xiang Li Yongzheng Zhang cheng Ma xiaomin cheng Jian Wang Jitong Wang Hongzhen Lin Licheng Ling State Key Laboratory of Chemical Engineering Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education)East China University of Science and TechnologyShanghai 200237China Institute of New Energy Materials and Engineering College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education) School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China i-Lab&CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Helmholtz Institute Ulm(HIU) D89081 UlmGermany

Lithium-sulfur(Li-S)batteries mainly rely on the reversible electrochemical reaction of between lithium ions(Li^(+))and sulfur species to achieve energy storage and conversion,therefore,increasing the number of free Li^(+)and improving the Li^(+)diffusion kinetics will effectively enhance the cell ***,Mo-based MXene heterostructure(MoS_(2)@Mo_(2)C)was developed by partial vulcanization of Mo_(2)C MXene,in which the introduction of similar valence S into Mo-based MXene(Mo_(2)C)can create an electron delocalization *** theoretical simulations and electrochemical characterisation,it is demonstrated that the MoS_(2)@Mo_(2)C heterojunction can effectively promote ion desolvation,increase the amount of free Li^(+),and accelerate Li^(+)transport for more efficient polysulfide *** addition,the MoS_(2)@Mo_(2)C material is also capable of accelerating the oxidation and reduction of polysulfides through its sufficient defects and vacancies to further enhance the catalytic ***,the Li-S battery with the designed MoS_(2)@Mo_(2)C electrocatalyst performed for 500 cycles at 1 C and still maintained the ideal capacity(664.7 mAh·g^(−1)),and excellent rate performance(567.6 mAh·g^(−1)at 5 C).Under the extreme conditions of high loading,the cell maintained an excellent capacity of 775.6 mAh·g^(−1)after 100 *** also retained 838.4 mAh·g^(−1)for 70 cycles at a low temperature of 0℃,and demonstrated a low decay rate(0.063%).These results indicate that the delocalized electrons effectively accelerate the catalytic conversion of lithium polysulfide,which is more practical for enhancing the behaviour of Li-S batteries.

关键词： delocalized electron lithium sulfur batteries MXene-based heterostructures catalytic desolvation multi-catalytic sites

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纳米TiO_(2)微球的制备及光催化降解气相苯特性

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功能材料 2024年第7期55卷 7231-7236页

作者：杜晶晶赵军伟施飞程晓民宁波工程学院机械工程学院浙江宁波315016

以四氯化钛和尿素为原料,通过溶剂热法制备了纳米TiO_(2)微球。利用XRD、FE-SEM、TEM、UV-Vis、BET测试手段对样品的组成、结构、形貌、光学性能、比表面特性进行分析,以气相苯为目标降解物,研究不同溶剂热时间所制备的微球对光催化活... 详细信息

以四氯化钛和尿素为原料,通过溶剂热法制备了纳米TiO_(2)微球。利用XRD、FE-SEM、TEM、UV-Vis、BET测试手段对样品的组成、结构、形貌、光学性能、比表面特性进行分析,以气相苯为目标降解物,研究不同溶剂热时间所制备的微球对光催化活性的影响。结果表明,随溶剂热时间的延长,TiO_(2)微球结构经历了实心-核壳-空心的演变过程,但均由20 nm以下的颗粒组成。此类微球的光吸收带边出现明显“蓝移”现象,且光吸收性能较P25 TiO_(2)要高,比表面积是其3~5倍。其中溶剂热时间为6 h所制备的核壳结构微球光催化活性最佳,降解气相苯的矿化率高达93%,高于P25 TiO_(2)近3倍,分析表明,该优异性能得益于核壳结构对光的充分反射吸收和高比表面积导致的吸附协同光催化特性。

关键词：纳米TiO_(2)微球溶剂热法中空核壳结构光催化气相苯

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SSD/PAM-SA双网络复合相变水凝胶的制备及热性能研究

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储能科学与技术 2024年第10期13卷 3369-3375页

作者：闫博康李林峰李元元程晓敏武汉理工大学材料科学与工程学院湖北武汉430070 黄冈师范学院机电与智能制造学院湖北黄冈438000

为解决无机水合盐相变材料在实际应用中稳定性差的问题,拓宽无机水合盐相变材料在中低温热能存储领域的应用范围,本研究通过聚丙烯酰胺(polyacrylamide,PAM)和海藻酸钠(sodium alginate,SA)双网络水凝胶包覆Na_(2)SO_(4)·10H_(2)O(sodi... 详细信息

为解决无机水合盐相变材料在实际应用中稳定性差的问题,拓宽无机水合盐相变材料在中低温热能存储领域的应用范围,本研究通过聚丙烯酰胺(polyacrylamide,PAM)和海藻酸钠(sodium alginate,SA)双网络水凝胶包覆Na_(2)SO_(4)·10H_(2)O(sodium sulfate decahydrate,SSD)制备了一种相变温度范围为30~45℃的无机水合盐复合相变材料。实验通过SEM、FT-IR、XRD和DSC等方法对相变水凝胶的微观结构、化学成分、晶体结构和热物理性能进行测试分析。结果表明,SSD能够有效地被双网络水凝胶包覆形成复合相变水凝胶,相变水凝胶具有较高的热导率、良好的形状稳定性和出色的控温性能。当SSD质量分数为70%时,相变水凝胶的熔融焓达到123.91 J/g。相变水凝胶在经历500次热循环后,相变水凝胶的相变潜热和温度均保持稳定,显示出良好的热循环稳定性。本研究有效解决了无机水合盐相变材料稳定性差的问题,为后续无机水合盐在中低温热能储存领域的应用提供了新的思路和理论数据支撑。

关键词：十水硫酸钠双网络水凝胶相变材料热性能

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等离子体增强原子层沉积二氧化硅对多晶硅的损伤机理及防范工艺研究

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真空科学与技术学报 2024年第6期44卷 552-558页

作者：何亚东袁刚李拓周毅程晓敏霍宗亮长江存储科技有限责任公司武汉430078 华中科技大学集成电路学院武汉430074 华中科技大学化学与化工学院武汉430074

文章通过电子束检测(EBI)手段研究了等离子体增强原子层沉积(PEALD) SiO_(2)过程中硅烷基酰胺类前驱体副产物对多晶硅产生不可逆损伤的机理。提出用单胺基硅烷基酰胺替代多胺基硅烷基酰胺作为前驱体,来减轻对多晶硅材料的损伤。在不损... 详细信息

文章通过电子束检测(EBI)手段研究了等离子体增强原子层沉积(PEALD) SiO_(2)过程中硅烷基酰胺类前驱体副产物对多晶硅产生不可逆损伤的机理。提出用单胺基硅烷基酰胺替代多胺基硅烷基酰胺作为前驱体,来减轻对多晶硅材料的损伤。在不损伤多晶硅前提下,进一步研究化学位阻较小的单胺基前驱体二异丙胺硅烷(DIPAS)对反应速率的影响。

关键词：等离子体增强原子层沉积硅烷基酰胺氧化硅二异丙胺硅烷(DIPAS)

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基于激光测振技术的铣床电主轴振动特性研究

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中国工程机械学报 2024年第2期22卷 191-195页

作者：肖天祥施飞易新华程晓民宁波工程学院机械与汽车工程学院浙江宁波315211 长安大学工程机械学院陕西西安710064

采用激光测振技术获取了机床不同转速下的振动信号,并分析研究了其振动特性。使用激光测振仪采集机床电主轴的振动速度信号,避免了传统传感器带来的附加质量问题,提高了测量的准确性。完成电主轴在不同位置测点和不同转速运转状态下的... 详细信息

采用激光测振技术获取了机床不同转速下的振动信号,并分析研究了其振动特性。使用激光测振仪采集机床电主轴的振动速度信号,避免了传统传感器带来的附加质量问题,提高了测量的准确性。完成电主轴在不同位置测点和不同转速运转状态下的振动信号采集实验,对采集到的原始振动速度信号和原始振动速度信号,经积分得到的振动位移信号,并进行时域分析。结果表明:在所测转速范围内机床电主轴的振动位移平均幅值稳定在1μm范围内;在所测转速范围内,随着转速的增加,电主轴各个测点的振动烈度是先缓慢增加再减小再快速增加的趋势,在14 000 r/min振动烈度局部最小,该结果可指导实际加工过程中的加工参数选择;电主轴上测点轴向方向位置距离主轴端部越近,振动烈度越大,检测主轴振动状况是否异常时应选取靠近主轴端部的测点来代表电主轴的振动状况。

关键词：电主轴性能检测激光测振技术振动特性

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The effect of multilayer structure on magnetic properties of FePt thin films

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 22-26页

作者： Kaifeng DONG Xiaofei YANG Junbing YAN Weiming cheng xiaomin cheng Department of Electronic Science ＆： Technology Huazhong University of Science ＆ TechnologyWuhan 430074 China

The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.

关键词： L10-FePt thin films Multilayer structure Coercivity Ordering temperature

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Preparation and Properties of 1-octadecanol/1,3:2,4-di-(3,4-dimethyl) Benzylidene Sorbitol/Expanded Graphite Form-stable Composite Phase Change Material

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Journal of Wuhan University of Technology(Materials Science) 2019年第3期34卷 728-735页

作者： XU Jun cheng xiaomin School of Mechanical and Electrical Engineering Huanggang Normal UniversityHuanggang438000China

A 1-octadecanol（OD）/1,3:2,4-di-（3,4-dimethyl） benzylidene sorbitol（DMDBS）/expander graphite（EG） composite was prepared as a form-stable phase change material（PCM） by vacuum melting method. The results of field emission-scanning electron microscopy（FE-SEM） showed that 1-octadecanol was restricted in the three-dimensional network formed by DMDBS and the honeycomb network formed by EG. X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR） results showed that no chemical reaction occurred among the components of composite PCM in the preparation process. The gel-to-sol transition temperature of the composite PCMs containing DMDBS was much higher than the melting point of pure 1-octadecanol. The improvements in preventing leakage and thermal stability limits were mainly attributed to the synergistic effect of the three-dimensional network formed by DMDBS and the honeycomb network formed by EG. Differential scanning calorimeter（DSC） was used to determine the latent heat and phase change temperature of the composite PCMs. During melting and freezing process the latent heat values of the PCM with the composition of 91% OD/3% DMDBS/6% EG were 214.9 and 185.9 kJ·kg-1, respectively. Its degree of supercooling was only 0.1 ℃. Thermal constant analyzer results showed that its thermal conductivity（κ） changed up to roughly 10 times over that of OD/DMDBS matrix.

关键词： 1-octadecanol 1,3,4-di-(3,4-dimethyl) benzylidene sorbitol expander graphite composite phase change materials synergistic effect gelator

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Effect of Ni doping on the microstructure and magnetic properties of FePt films

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Rare Metals 2009年第3期28卷 257-260页

作者： DONG Kaifeng cheng xiaomin YAN Junbing cheng Weiming LI Peng YANG Xiaofei Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

FePtNi films with different Ni contents were deposited on glass substrates by RF magnetron sputtering, and the L10-FePtNi films were obtained after the asdeposited samples were subjected to vacuum annealing. The magnetic properties, structures, and orientations of the L10-FePt films with Ni doping were studied. The results show that with increasing Ni content, the （001） peak position of the FePtNi films shifts to a higher angle in comparison with FePt, which suggests that there is partial Ni substitution in the L10 lattice. The perpendicular coercivity decreases from 661 to 142 kA/m and magnetization decreases from 512 to 433 kA/m with increasing Ni content. In comparison with FePt films, the FePtNi films can effectively reduce the Curie temperature, which makes FePtNi films promising media candidates in thermally assisted recording （TAR）.

关键词： FePtNi films Curie temperature magnetization coercivity

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A review of internally heat integrated distillation column

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1272-1281页

作者： Jing Fang xiaomin cheng Zhongyang Li Hao Li Chunli Li School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization Tianjin 300130China

The energy consumption of distillation operation determines the amount of energy consumption throughout the chemical separation process. A heat integrated distillation column(HIDiC) could greatly reduce the irreversibility of the distillation process, so it gradually becomes a research hotspot. There are two major techniques for heat integration in HIDiC: internally and externally. This review paper describes the major research aspects of an internally heat integrated distillation column(IHIDiC), including the heat transfer models, various design structures(including the two-column HIDiC, Concentric HIDiC, Shell and tube HIDiC, Plate-fin HIDiC and the Super HIDiC, etc.), experimental research, simulation and optimization, process control research, as well as industrial plants and potential industrial applications. Among them, the heat transfer performance of various structures was analyzed of the various design structures based on experimental research, the effects of different factors(including relative volatility, reflux ratio, compression ratio, etc.) on HIDiC energy consumption or TAC is summarized in the simulation part. The calculation methods of the overall heat transfer coefficient and heat transfer models are summarized. The various optimization algorithms and optimization results of simplified HIDiC are summarized in the optimization part. The research status and the key technical issues in various aspects of HIDiC are summarized in this paper. In order to meet the requirements of industrial energy efficiency,the selection of multi-component separation distillation configurations needs to be considered more diversified,and internal complex coupling relationship of HIDiC needs to be further studied.

关键词： HIDIC Distillation Heat integrated Energy consumption Energy conservation

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Numerical Simulation on Heat Transfer Enhancement of Phase Change Thermal Storage Devices for Low-middle Temperature

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Journal of Wuhan University of Technology(Materials Science) 2016年第4期31卷 799-804页

作者：孙正朱教群 zhou weibing cheng xiaomin zhu jinrong School of Materials Scienceand Engineering Wuhan University of Technology Wuhan 430070 China

Using Ba（OH）2·8H2O as phase change material（PCM） and water as heat transfer fluid（HTF）,we numerically simulated annular finned-tube heat *** order to measure and analyze the impact of parameters in the heating/cooling process,temperature changes of different monitoring points,fin widths,and fin pitches as key parameters were considered and *** experimental results show that the heat exchange process can be divided into three stages within a certain *** faster heat transfer rate is associated with the greater temperature difference between PCM and ***,fins width and pitch affect dramatically the heat charging/discharging *** large fins width or small fins pitch is beneficial for extending the heat exchange surface,leading to improve heat transfer efficiency.

关键词： heating pitch faster charging annular melting numerically dramatically vertically encapsulation

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