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Phase-separated bimetal enhanced sodium storage:Dimer-like Sn-Bi@C heterostructures with high capacity and long cycle life

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Journal of Energy Chemistry 2023年第4期79卷 468-476页

作者： Xiaoxiao Hou Yansong Zhu Qian Yao Jinmei Song Chunsheng Wang Yanli Zhou Suyuan Zeng Jian Yang Yitai Qian Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100ShandongChina Department of Environmental and Material Engineering Yantai UniversityYantai 264005ShandongChina Department of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252059ShandongChina Hefei National Laboratory for Physical Science at Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Phase boundaries facilitate the charge transportation and alleviate the intrinsic stress upon ***,how to achieve regular phase boundaries is very ***,dimer-like Sn-Bi@C nanostructures,where is a well-defined phase boundary between Sn and Bi,have been prepared by a two-step process for the first *** phase boundary not only provides additional and fast transportation for Na+,but also mitigates the structure stress/strain upon ***,Sn-Bi@C exhibits a high capacity(472.1 m A h g^(-1)at 2 A g^(-1)for 200 cycles),an ultra-long cyclic life(355.6 mA h g^(-1)at 5 A g^(-1)for 4500cycles)and an excellent rate performance(372 mA h g^(-1)at 10 A g^(-1))for sodium storage,much higher than those of Sn@C,Bi@C,and Sn@C+Bi@***,the full cells of Sn-Bi@C//Na_(3)V_(2)(PO_(4))_(3)/rGO(SnBi@C//NVP/rGO)demonstrate impressive performance(323 mA h g^(-1)at 2 A g^(-1)for 300 cycles).The underlying mechanism for such an excellent performance is elucidated by in-situ X-ray diffraction,exsitu scanning electron microscopy/high-resolution transmission electron microscopy and atomic force microscopy,revealing the good electrode stability and improved mechanical properties of Sn-Bi@*** synthetic method is extended to dimer-like Sn-Pb@C and Sn-Ag@C heterostructures,which also exhibit the good cycle stability for sodium storage.

关键词： Bi Sn Alloy-type anodes Sodium-ion batteries Phase boundaries

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基于蒽和三苯胺基D-π-A结构的蓝色荧光材料在有机发光和紫外探测集成器件中的应用

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science China Materials 2024年第1期67卷 197-204页

作者：董文健白雲水王雅婷赵松许慧侠苗艳勤罗巧王华于军胜 Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯... 详细信息

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯胺(2mTPA)分别为给体,设计并合成了两种可用于OLED-UVOPD器件的蓝色发光分子,TPA-AN和2mTPA-AN.它们的发光峰分别位于474和488 nm处,荧光量子产率为51.1%和46.6%.通过单载流子器件计算得到其电子迁移率分别为3.96×10^(-5)和6.63×10^(-7)cm^(2)V^(-1)s^(-1).基于TPA-AN的OLED器件表现出强的蓝光发射,最大亮度为43,110 cd m^(-2),最大外量子效率(EQE)为8.1%.它们在OLED-UVOPD集成器件中表现出优异的性能,紫外探测率分别为7.18×10^(11)和2.85×10^(12)Jones,最大EQE分别为8.7%和5.9%.

关键词：紫外探测集成器件有机光电材料电子迁移率光电子器件最大亮度蓝色发光 OLED

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Digital interpretation of Tai Chi basic skills based on surface electromyography feature analysis 4

Digital interpretation of Tai Chi basic skills based on surf...

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4th International Conference on Biomedicine and Bioinformatics engineering, ICBBE 2024

作者： Li, Mengmeng Gu, Zhiyuan Wan, Hong School of Electrical and Information Engineering Zhengzhou University Zhengzhou450001 China Henan Key Laboratory of Brain Science and Brain-Computer Interface Technology Zhengzhou450001 China

ISBN: (纸本)9781510682443

Basic Tai Chi exercises serve as the foundation and core of Tai Chi practice. A deep understanding of the movement principles and essential characteristics is crucial to ensuring the effectiveness of training. However, practitioners often struggle to grasp the essentials, resulting in minimal progress or even injuries that may lead them to abandon the practice. To achieve a digital interpretation of the movement transitions and force application principles in basic Tai Chi exercises, we introduced surface electromyography (sEMG) detection into basic Tai Chi in this study. Eight Tai Chi experts were invited to construct an expert subject dataset. Then we extracted and analyzed the integral whole electric value and contribution rates of relevant muscles in basic Kai He Gong (KHG) exercise, as well as the dynamic changes on both sides of the body. An improved Teager-Kaiser Energy (TKE) algorithm was used to accurately identify the muscle force sequencing in expert-level and trainee-level basic movement. The results revealed that the cooperated relationship the left and right body sides and the crucial role of the erector spinae in the waist connecting the upper and lower limbs in the KHG exercises, demonstrating the Tai Chi principle of "controlling from the waist". In all, we explored the sEMG activity patterns in basic Tai Chi exercises in this study, enabling a digital interpretation of movement transitions and muscle force application principles. The results could provide references for the training and teaching of basic Tai Chi exercises. © 2024 SPIE.

关键词： Electromyography

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Striatal Local Field Potential Dynamics During Decision-Making Learning in Pigeons 24

Striatal Local Field Potential Dynamics During Decision-Maki...

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16th International Conference on Bioinformatics and Biomedical Technology, ICBBT 2024

作者： Jin, Fuli Wang, Yinghui Shang, Zhigang School of Electrical and Information Engineering Zhengzhou University Zhengzhou450001 China Henan Key Laboratory of Brain Science and Brain-Computer Interface Technology Zhengzhou450001 China

ISBN: (纸本)9798400717666

Decision-making is a complex cognitive process vital for the survival and adaptive behavior of species, and the neural mechanisms behind this behavior have been the focus of extensive *** striatum is a key region in the brain that plays a crucial role in the decision-making process, making it an ideal candidate for investigating the neural correlates of learning and *** study aims to explore the changes in the striatum and its local field potentials (LFPs) during the learning of decision-making, providing potential insights into the role of the striatum in decision-making in *** study simultaneously collected behavior data and striatal LFPs from 4 pigeons during a three-armed bandit *** pigeons' learning process, behavioral accuracy, reward probabilities, and"win-stay-lose-shift" characteristics were *** power changes in six different frequency bands of striatal LFPs between the early and late stages of learning were *** pigeons' learning process significantly modulated the power in the Beta frequency band, indicating its crucial role in ***, the power of the Theta, Alpha, and Beta bands correlated with choices suggesting a high reward probability, emphasizing the relationship between reward probability and the modulation of power in the *** study sheds light on the neural processes underlying decision-making in pigeons, demonstrating the modulation of LFP power in the striatum and its relationship to reward *** findings contribute to our understanding of decision-making processes in animals. © 2024 Copyright held by the owner/author(s).

关键词： Decision making

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Two-step Thompson Sampling for Multi-Armed Bandit Problem 43

Two-step Thompson Sampling for Multi-Armed Bandit Problem

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43rd Chinese Control Conference, CCC 2024

作者： Shang, Zhigang Yang, Lifang Li, Mengmeng Zhengzhou University School of Electrical and Information Engineering Zhengzhou450001 China Henan Key Laboratory of Brain Science and Brain-Computer Interface Technology Zhengzhou450001 China

ISBN: (纸本)9789887581581

An important feature of sequential decision-making under uncertain conditions is to strike a balance between exploration (obtaining information about the value of actions) and utilization (selecting the best action based on existing knowledge). The multi-armed bandit is a classic task for balancing their relationship. As the agent has learnt the relationship between two options in a 2-armed bandit task, it will no longer explore but instead use them directly. Inspired by the research, an algorithm based on two-step Thompson sampling (T-TS) is proposed to solve multi-armed bandit problem. First, posterior Beta distributions for the reward of each arm and the probability of the superior arm were established respectively. In the first-step TS, Thompson sampling was used to extract the maximum value from the posterior distribution of probability for the superior arm, determining it as the selected arm. In the two-step TS, Thompson sampling was used to sample from the distributions of the reward. During the updating, the posterior distribution of the probability for the superior arm was updated based on observations including actions and reward, and the distribution of the reward was updated based on the reward feedback. We performed the comparative experiments to solve the static multi-bandit tasks with 10, 20, 40, and 80 arms respectively by the state-of-the-art B-UCB algorithm, Thompson sampling and the proposed T-TS. The results shown that our proposed T-TS can learn the superior action more quickly with the best robustness. © 2024 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Importance sampling

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Compacted mesoporous titania nanosheets anode for pseudocapacitance-dominated,high-rate,and high-volumetric sodium-ion storage

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SmartMat 2023年第5期4卷 109-118页

作者： Jiayu Yu Xiaojuan Huang Yalin He Dafu Tang Tingyi Huang Lu Liu Haobin Wu Dong-Liang Peng Dongyuan Zhao Kun Lan Qiulong Wei Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials Department of Materials Science and EngineeringCollege of MaterialsXiamen UniversityXiamenChina College of Energy Materials and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhotChina Laboratory of Advanced Materials Department of ChemistryCollege of Chemistry and MaterialsFudan UniversityShanghaiChina State Key Laboratory of Silicon Materials Institute for Composites Science Innovation(IncSI)School of Materials Science and EngineeringZhejiang UniversityHangzhouChina

Surface-redox pseudocapacitive nanomaterials show promise for fast-charging energy ***,their high surface area usually leads to low density,which is not conducive to achieving both high volumetric capacity and high-rate ***,we demonstrate that TiO_(2)nanosheets(meso-TiO_(2)-NSs)with densely packed mesoporous are capable of fast pseudocapacitance-dominated sodium-ion storage,as well as high volumetric and gravimetric *** compressing treatment,the compaction density of meso-TiO_(2)-NSs is up to~1.6g/cm^(2),combined with high surface area and high porosity with mesopore channels for rapid Na+*** compacted meso-TiO_(2)-NSs electrodes achieve high pseudocapacitance(93.6%of total charge at 1mV/s),high-rate capability(up to 10 A/g),and long-term cycling stability(10,000 cycles).More importantly,the space-efficiently packed structure enables high volumetric *** thick-film meso-TiO_(2)-NSs anode with the mass loading of 10mg/cm^(2)delivers a gravimetric capacity of 165 mAh/g and a volumetric capacity of 223 mAh/cm^(3)at 5 mA/cm^(2),much higher than those of commercial hard carbon anode(80mAh/g and 86mAh/cm^(3)).This work highlights a pathway for designing a dense nanostructure that enables fast charge kinetics for high-density sodium-ion storage.

关键词： high volumetric capacity mesoporous materials sodium-ion batteries titanium dioxide

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Transformation of CO2 and H2 to C2+ chemicals and fuels

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National science Review 2023年第9期10卷 17-19页

作者： Qingli Qian Buxing Han Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics CAS Research/Education Center for Excellence in Molecular Sciences Center for Carbon Neutral Chemistry Institute of ChemistryChinese Academy of Sciences Physical Science Laboratory Huairou National Comprehensive Science Center School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University

CO2is a greenhouse gas,and is also a cheap,easily available and renewable carbon *** of CO2into chemicals has been extensively investigated in the forms of thermo catalysis,electrocatalysis and photo ***2is the highes...

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Immobilizing VN ultrafine nanocrystals on N-doped carbon nanosheets enable multiple effects for high-rate lithium-sulfur batteries

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Nano Research 2022年第2期15卷 1424-1432页

作者： Ning Song Baojuan Xi Peng Wang Xiaojian Ma Weihua Chen Jinkui Feng Shenglin Xiong Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Key Laboratory of Material Processing and Mold of Ministry of Education Zhengzhou UniversityZhengzhou 450001China Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan 250061China

The exploitation of new sulfiphilic and catalytic materials is considered as the promising strategy to overcome severe shuttle effect and sluggish kinetics conversion of lithium polysulfides within lithium-sulfur ***,we design and fabricate monodisperse VN ultrafine nanocrystals immobilized on nitrogen-doped carbon hybrid nanosheets(VN@NCSs)via an one-step in-situ selftemplate and self-reduction strategy,which simultaneously promotes the interaction with polysulfides and the kinetics of the sulfur conversion reactions demonstrated by experimental and theoretical *** virtue of the multifunctional structural features of VN@NCSs,the cell with ultrathin VN@NCSs(only 5 pm thickness)modified separator indicates improved electrochemical performances with long cycling stability over 1,000 cycles at 2 C with only 0.041%capacity decay per cycle and excellent rate capability(787.6 mAh g^(-1) at 10 C).Importantly,it delivers an areal reversible capacity of 3.71 mAh cm^(-2) accompanied by robust cycling life.

关键词： VN nanocrystals polysulfide transformation shuttle effect lithium-sulfur batteries

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Synthesis of carbon nanotubes-supported porous silicon microparticles in low-temperature molten salt for highperformance Li-ion battery anodes

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Nano Research 2022年第7期15卷 6184-6191页

作者： Qianliang Zhang Baojuan Xi Weihua Chen Jinkui Feng Yitai Qian Shenglin Xiong Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Key Laboratory of Material Processing and Mold of Ministry of Education Zhengzhou UniversityZhengzhou 450001China Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan 250061China

Silicon-based materials has attracted attention as a promising candidate for lithium-ion batteries(LIBs)with high energy ***,severe volume variation,pulverization,and poor conductivity hindered the development of Si based *** this study,porous Si microparticles supported by carbon nanotubes(p-Si/CNT)are fabricated through simple molten salt assisted dealloying process at low temperature followed by acid *** ZnCl2 molten salt not only provides the liquid environment to enhance the reaction,but also participates the dealloying process and works as template for porous structure when removes by acid ***,distribution of defect sites in CNTs also increases after molten salt *** function theory(DFT)calculations further prove the defects could improve the adsorption of Li+.The participation of CNTs can also contribute to the reaction kinetics and retain the integrity of the *** expected,the p-Si/CNT anode manifests enhanced lithium-storage performance in terms of superior cycling stability and good rate *** p-Si/CNT//LiCoO_(2) full cell assembly further demonstrates its potential as a prospective anode for high-performance LIBs.

关键词： porous Si microparticles carbon nanotubes molten salt lithium-ion batteries

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Structure evolution of the Fe_(3)C/Fe interface mediated by cementite decomposition in cold-deformed pearlitic steel wires

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Journal of Materials science & Technology 2022年第6期101卷 28-36页

作者： Y.T.Zhou X.H.Shao S.J.Zheng X.L.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China

Cold-drawn pearlitic steel wire is irreplaceably used in industry owing to its outstanding mechanical property which is dominated by the cementite/ferrite(Fe_(3)C/Fe) interfaces in the material. However, the fine structures of the Fe3C/Fe interfaces in the deformed wires are less known to date. In this work, transmission electron microscopic investigation was performed on the atomic structures of the interfaces with the Isaichev orientation relationship(OR) in the wires with progressive deformation strains. In addition to the effect of the dislocation/interface interactions, this work revealed that the deformation-induced partial decomposition of cementite plays an important role in the interface reconstruction during deformation. The interfacial carbon vacancies generated by cementite decomposition and particularly, the amorphization of cementite layers in the sample with ε > 1 could effectively annihilated the interfacial dislocations and consequently relaxed the interfacial stress. The correlations between the interface structure changes and the mechanical properties of the wires were discussed.

关键词： Pearlitic steel Cementite decomposition interface structure Deformation Transmission electron microscopy

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