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Cs-Induced Phase Transformation of Vanadium Oxide for High-Performance Zinc-Ion Batteries

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Energy & Environmental Materials 2023年第4期6卷 265-272页

作者： gan qu Kai Guo Weijie Chen Yu Du Ye Wang Bingbing Tian Jianan Zhang Key Laboratory of Advanced Energy Catalytic and Functional Materials Preparation of Zhengzhou City College of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Rechargeable aqueous zinc-ion batteries are promising candidate for gridscale energy storage.However,the development of zinc-ion batteries has been plagued by the lack of cathode materials with high specific capacity and superior lifespan.Herein,hexagonal Cs_(0.3)V_(2)O_(5)cathode is fabricated and investigated in zinc-ion batteries.Compared with the traditional vanadium oxides,the introduction of Cs changes the periodic atomic arrangements,which not only stabilizes the open framework structure but also facilitates the Zn^(2+)diffusion with a lower migration energy barrier.Consequently,high specific capacity of 543.8 mA h g^(-1)at 0.1 A g^(-1)is achieved,which surpasses most of reported cathode materials in zinc-ion batteries.The excellent cycle life is achieved over 1000 cycles with about 87.8%capacity retention at 2 A g^(-1).Furthermore,the morphological evolution and energy storage mechanisms are also revealed via a series of techniques.This work opens up a phase engineering strategy to fabricate the hexagonal vanadium oxide and elucidate the application of phase-dependent cathodes in zinc-ion batteries.

关键词： cathode materials phase engineering vanadium oxide zinc-ion batteries

Probing the active sites of 2D nanosheets with Fe-N-C carbon shell encapsulated Fe_(x)C/Fe species for boosting sodium-ion storage performances

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Nano Research 2022年第8期15卷 7154-7162页

作者： Huicong Xia Pengfei Yuan Lingxing Zan gan qu Yunchuan Tu Kaixin Zhu Yifan Wei Zeyu WeiFangying Zheng Mo Zhang Yongfeng Hu Dehui Deng Jianan Zhang College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Physics and Engineering Zhengzhou UniversityZhengzhou 450001China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China Key Laboratory of Chemical Reaction Engineering of Shaanxi Province College of Chemistry&Chemical EngineeringYan’an UniversityYan’an 716000China Canadian Light Source 44 Innovation Boulevard SaskatoonSaskatoon S7N 2V3Canada

Developing stable but high active metal-nitrogen-carbon(M-N-C)-based hard carbon anode is a promising way to be the alternatives to graphene and blank hard carbon for sodium-ion batteries(SIBs),requiring the precise tailoring of the electronic structure for optimizing the Na+intercalation behavior,yet is greatly challenging.Herein,Fe-N-C graphitic layer-encapsulating Fe3C species within hard carbon nanosheets(Fe-N-C/Fe3C@HCNs)are rationally engineered by pyrolysis of self-assembled polymer.Impressively,the Fe-N-C/Fe3C@HCNs exhibit outstanding rate capacity(242 mAh·g^(−1)at 2,000 mA·g^(−1)),which is 2.1 and 4.2 times higher than that of Fe-N-C and N-doped carbon(N-C),respectively,and prolonged cycling stability(176 mAh·g^(−1)at 2,000 mA·g^(−1)after 2,000 cycles).Theoretical calculations unveil that the Fe3C species enhance the electronic transfer from Na to Fe-N-C,resulting in the charge redistribution between the interfaces of Fe3C and Fe-N-C.Thus,the optimized adsorption behavior towards Na+reduces the thermodynamic energy barriers.The synergistic effect of Fe3C and Fe-N-C species maintains the structural integrity of electrode materials during the sodiation/desodiation process.The in-depth insight into the advanced Na+storage mechanisms of Fe3C@Fe-N-C offers precise guidance for the rational establishment of confinement heterostructures in SIBs.

关键词： Fe-N-C/Fe3C species encapsulated carbon nanosheets sodium-ion storage density functional theory

Atomically Dispersed Fe-N_(4) Sites and Fe_(3)C Particles Catalyzing Polysulfides Conversion in Li-S Batteries

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Chemical Research in Chinese Universities 2022年第5期38卷 1232-1238页

作者： CHEN Weijie XIA Huicong GUO Kai JIN Wangzhe DU Yu YAN Wenfu qu gan ZHANG Jianan College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

Lithium-sulfur(Li-S)batteries have been puzzled by the“shuttle effect”.In the recent years,catalytic materials present a huge potential for solving this problem.However,the exploitation for catalytic activity was still challenging in Li-S batteries.In this article,we put forward a single atom catalyst(SAC)of FeN_(4) coupled with Fe_(3)C on the N-doped carbon(FeN_(4)/Fe_(3)C@NC)by one-step pyrolysis method.The FeN_(4) and Fe_(3)C synergistically catalyze the polysulfides conversion when the N-doped carbon provides the high conductive three-dimensional skeleton in Li-S batteries.As a result,the FeN_(4)/Fe_(3)C@NC shows a specific capacity of 1100 mA·h/g at 0.2 C(1 C=1675 mA/g).In addition,the FeN_(4)/Fe_(3)C@NC maintains 99.01%of the pristine specific capacity after 100 cycles at 0.5 C,indicating the improved electrochemical performance in Li-S batteries.This work sheds new lights on the design of engineering catalysts for developing high-performance Li-S batteries.

关键词： FeN_(4) Fe_(3)C Li-S battery Shuttle effect

碳基催化剂用于电催化氧还原生产H_(2)O_(2)的研究进展:策略、计算及实际应用

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高等学校化学学报 2023年第5期44卷 14-36页

作者：张小玉曲干薛冬萍闫文付张佳楠郑州大学材料科学与工程学院郑州450001 吉林大学化学学院无机合成与制备化学国家重点实验室长春130012

过氧化氢(H_(2)O_(2))作为一种多功能且环保的氧化剂,在工业生产、漂白、消毒和废水处理等领域都发挥着重要作用.传统的蒽醌工艺由于不环保、不安全且流程复杂,无法成为批量生产过氧化氢的最佳选择.基于电化学氧还原反应(ORR)的合成方... 详细信息

过氧化氢(H_(2)O_(2))作为一种多功能且环保的氧化剂,在工业生产、漂白、消毒和废水处理等领域都发挥着重要作用.传统的蒽醌工艺由于不环保、不安全且流程复杂,无法成为批量生产过氧化氢的最佳选择.基于电化学氧还原反应(ORR)的合成方法是一种有价值的替代蒽醌生产的方法.通常,H_(2)O_(2)可以通过2e^(-)ORR过程合成.碳基催化剂因储量丰富、成本低、结构可调和导电性好等优点,被认为是用于2e^(-)ORR的最佳催化剂之一.本文综合评述了近年来碳基催化剂在电化学合成H_(2)O_(2)方面的研究进展.首先,介绍了2e^(-)ORR过程的基本原理,揭示了影响ORR路径的关键因素;然后,阐述了密度泛函理论(DFT)计算对揭示催化活性位点的关键作用,并指明火山图是一种预测催化剂选择性的重要工具;综合评述了促进H_(2)O_(2)产生的几种有效策略(优化金属单原子、构建催化剂表面缺陷工程、引入吡咯氮、掺杂含氧官能团及掺杂其它杂原子);介绍了批量生产H_(2)O_(2)的装置发展及其优缺点;最后,展望了电化学合成H_(2)O_(2)在未来发展中可能面临的机遇和挑战.

关键词：过氧化氢二电子氧还原碳基催化剂火山图电解池

高新技术企业知识型员工关键激励因素识别与策略体系构建——基于聚类与Nvivo质性分析的双重考量

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科学管理研究 2018年第1期36卷 77-80页

作者：瞿淦苏州大学东吴商学院江苏苏州215006

基于以往理论研究成果,从薪酬激励、工作成就、员工成长、工作环境4个维度构建了知识型员工激励因素模型,并以江苏76家高新技术企业研发者为调查对象,采用聚类与Nvivo质性分析方法进行知识型员工关键激励因素识别,从价值、减压、心理契... 详细信息

基于以往理论研究成果,从薪酬激励、工作成就、员工成长、工作环境4个维度构建了知识型员工激励因素模型,并以江苏76家高新技术企业研发者为调查对象,采用聚类与Nvivo质性分析方法进行知识型员工关键激励因素识别,从价值、减压、心理契约3个维度提出员工帮助计划(EAP)。

关键词：高新技术企业知识型员工激励因素员工帮助计划(EAP)

基于逆阻型IGCT器件的固态式直流断路器设计及研制

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高电压技术 2024年第2期50卷 551-560页

作者：严鑫余占清屈鲁甘之正任春频曾嵘清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室北京100084 清华四川能源互联网研究院直流研究中心成都610042 清华大学能源互联网创新研究院北京100084

直流系统是支撑高比例新能源接入与灵活高效用能的重要技术方向。固态式直流断路器(solid state DC circuit breaker,SSCB)具有开断速度极快、无电弧、寿命长等优点,在中低压直流系统的故障保护中得到广泛应用。随着电力电子器件的发展... 详细信息

直流系统是支撑高比例新能源接入与灵活高效用能的重要技术方向。固态式直流断路器(solid state DC circuit breaker,SSCB)具有开断速度极快、无电弧、寿命长等优点,在中低压直流系统的故障保护中得到广泛应用。随着电力电子器件的发展,固态式直流断路器的拓扑结构、工作性能也在不断进步。为此基于逆阻型集成门极换流晶闸管(intergated gate commutate thyristor,IGCT),提出了一种新型的固态式直流断路器结构及设计方法,通流支路采用逆阻IGCT反并联结构实现双向通流,缓冲支路采用金属氧化物避雷器(metal oxide varistor,MOV)-电容结构来抑制过电压,吸能支路采用MOV吸收系统能量。进一步地,给出了关键元器件的参数设计方法,并验证了有效性;设计了性能良好的重力热管散热器,单个模块散热功率可达700 W;提出了主被动结合的控保策略,提高断路器的保护性能。最后,研制了固态式直流断路器样机,可用于750 V以内的低压直流系统,额定通流可达2 kA,可在百微秒内开断10 kA故障电流,成本低、体积小、高可靠,具有良好的应用前景。

关键词：直流输配电固态式直流断路器逆阻型IGCT 反并联结构缓冲设计

Emission and capture characteristics of deep hole trap in n-gan by optical deep level transient spectroscopy

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Journal of Semiconductors 2024年第3期45卷 58-63页

作者： Jin Sui Jiaxiang Chen Haolan qu Yu Zhang Xing Lu Xinbo Zou School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China School of Microelectronics University of Chinese Academy of SciencesBeijing 100049China School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510275China

Emission and capture characteristics of a deep hole trap(H1)in n-gan Schottky barrier diodes(SBDs)have been investigated by optical deep level transient spectroscopy(ODLTS).Activation energy(Eemi)and capture cross-section(σ_(p))of H1 are determined to be 0.75 eV and 4.67×10^(−15)cm^(2),respectively.Distribution of apparent trap concentration in space charge region is demonstrated.Temperature-enhanced emission process is revealed by decrease of emission time constant.Electricfield-boosted trap emission kinetics are analyzed by the Poole−Frenkel emission(PFE)model.In addition,H1 shows point defect capture properties and temperature-enhanced capture kinetics.Taking both hole capture and emission processes into account during laser beam incidence,H1 features a trap concentration of 2.67×10^(15)cm^(−3).The method and obtained results may facilitate understanding of minority carrier trap properties in wide bandgap semiconductor material and can be applied for device reliability assessment.

关键词： gan deep level transient spectroscopy minority carrier trap time constant trap concentration

基于分子筛结构的钼钒氧化物相工程在锌离子电池中的研究

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Science China Materials 2022年第4期65卷 939-946页

作者：曲干邱春天王俊谭杰文贾双凤陈哲生 Jean-Pascal Rueff Wesley Guangyuan Zheng 苏陈良田冰冰 International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Department of Chemical and Biomolecular Engineering National University of Singapore10 Kent Ridge CrescentSingapore119260Singapore School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan430072China SociétéCivile Synchrotron SOLEIL L’Ormedes MerisiersSaint-AubinBP48Gif-sur-Yvette91192France Laboratoire de Chimie Physique-Matière et Rayonnement LCPMRSorbonne UniversitéCNRSParisF-75005France

随着大规模储能需求的不断增加,水性锌离子电池在世界范围内引起了越来越多的关注.然而,基于锌离子存储的宿主材料有限,严重地阻碍了锌离子电池的商业化应用.基于此,本论文精确地构建了一系列相结构(正交、三方和四方晶系)的钼钒氧化物... 详细信息

随着大规模储能需求的不断增加,水性锌离子电池在世界范围内引起了越来越多的关注.然而,基于锌离子存储的宿主材料有限,严重地阻碍了锌离子电池的商业化应用.基于此,本论文精确地构建了一系列相结构(正交、三方和四方晶系)的钼钒氧化物,研究了该钼钒氧化物电极材料在锌离子电池中的储锌性能.一系列开放的框架和隧道结构有利于锌离子的扩散动力学.通过相工程优化,正交晶系的钼钒氧化物电极材料的比容量能够达到约400 m A h g^(−1),循环稳定性达到了1000次.正交晶系的钼钒氧化物相中具有大量的六元和七元环结构,在锌离子的可逆嵌入/脱出反应方面发挥了至关重要的作用.本文提出的相工程策略为锌离子电池中正极材料的设计提供了一种新方法.

关键词： zinc-ion batteries phase engineering molybdenum oxides vanadium oxides

老年冠心病患者疾病不确定感及社会支持与生活质量的相关性

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中华老年多器官疾病杂志 2024年第5期23卷 378-381页

作者：吴红艳屈宁甘怀娟新疆医科大学第一附属医院心血管内科乌鲁木齐830054

目的分析老年冠心病患者疾病不确定感及社会支持与生活质量的相关性。方法回顾性分析2022年4月至2023年3月新疆医科大学第一附属医院心血管内科收治的150例老年冠心病患者的临床资料,包括一般人口学资料、Mishel疾病不确定感量表(MUIS... 详细信息

目的分析老年冠心病患者疾病不确定感及社会支持与生活质量的相关性。方法回顾性分析2022年4月至2023年3月新疆医科大学第一附属医院心血管内科收治的150例老年冠心病患者的临床资料,包括一般人口学资料、Mishel疾病不确定感量表(MUIS)、社会支持量表及生活质量量表得分等。采用SPSS 26.0统计软件进行数据分析。计量资料比较采用独立样本t检验或方差分析。采用Pearson相关性分析对老年冠心病患者疾病不确定感及社会支持与生活质量的相关性进行分析。采用logistic回归分析老年冠心病患者生活质量的影响因素。结果 150例老年冠心病患者疾病不确定感得分为(119.76±12.85)分,社会支持得分为(61.83±5.42)分,生活质量得分为(63.91±6.28)分。老年冠心病患者生活质量得分在文化程度、家庭人均月收入、治疗缴费方式方面比较,差异有统计学意义(P<0.05)。老年冠心病患者生活质量得分与疾病不确定感得分呈负相关(r=-0.501;P<0.05),与社会支持得分呈正相关(r=0.457;P<0.05)。文化程度(OR=2.824,95%CI 1.343~5.935)、家庭人均月收入(OR=2.751,95%CI 1.345~5.626)、治疗缴费方式(OR=2.702,95%CI 1.379~5.292)、疾病不确定感(OR=3.111,95%CI 1.474~6.565)及社会支持(OR=2.933,95%CI 1.451~5.928)是老年冠心病患者生活质量的影响因素。结论老年冠心病患者生活质量偏低,且与疾病不确定感、社会支持存在相关性,可针对老年冠心病患者生活质量的影响因素对患者进行干预,以提高患者生活质量。

关键词：老年人冠心病生活质量疾病不确定感社会支持