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Carbon-coated hybrid crystals with fast electrochemical reaction kinetics for ultra-stable and high-load sodium-ion batteries

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Rare Metals 2024年第2期43卷 647-657页

作者： Chuan ou Ming-Dong Tan Zhen-Bang Li Zhao-Jie Li Fei Tian Zheng-ping Qiao Dan-Ni Lei Cheng-Xin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou510275China

Owing to its high theoretical capacity and low cost,Sn has attracted significant attention in sodium-ion batteries.However,the slow kinetics of electrochemical reactions and the rapid decay of capacity resulting from drastic changes in the volume of Sn,as well as persistent side reactions between Sn and the organic electrolyte during the(de)sodium process,have limited its commercialization.To improve the electrochemical performance of Sn-based materials,the bottom-up method is normally used to prepare carbon-coated nanoparticles.However,its complex preparation processes and harsh conditions make it unsuitable for practical applications.Herein,a carbon-coated hybrid crystal composite(Sn/SnO_(x)@C)was prepared using an up-bottom method with commercial Sn/SnO nanoparticles.Various effects accelerate the electrochemical kinetics and inhibit the coarsening of Sn crystals.The Sn/SnO_(x)@C composite electrode exhibited capacity retention of 80.7%even after approximately 1000 cycles(360.4 mAh·g^(−1)) at a current density of 1 A·g^(−1).The high-load Na_(3)V_(2)(PO4)3||Sn/SnO_(x)@C full cell presents a capacity retention rate of 91.7%after 150 cycles at the current density of 0.5 A·g^(−1).This work may significantly accelerate the commercialization of the Sn/SnO_(x)@C composite in sodium-ion batteries with high energy density.

关键词： Sodium-ion batteries(SIBs) Sn-based anode Ultraviolet curing Up-bottom method

Amorphous Sb/C composite with isotropic expansion property as an ultra-stable and high-rate anode for lithium-ion batteries

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Rare Metals 2024年第5期43卷 2039-2052页

作者： Ze-Zhou Yang Cheng-Yi Zhang Yu-Qing ou Zhi-Kang Su Yan Zhao Heng-Jiang Cong Xin-ping Ai Jiang-Feng Qian Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular Sciences Wuhan University Institute of Technological Sciences Wuhan University

Antimony （Sb） is an intriguing anode material for Li-ion batteries （LIBs） owing to its high theoretical capacity of 660 m Ah·g-1and appropriate working potential of～0.8 V （vs.Li+/Li）.However,just like all alloying materials,the Sb anode suffers from huge volume expansion （230%） during repeated insertion/extraction of Li+ions,resulting in structural deterioration and rapid capacity decay.In this work,a novel amorphous Sb/C composite with atomically dispersed Sb particles in carbon matrix is prepared via a straightforward high-energy ball milling approach.The intimate intermixing of amorphous Sb with C provides homogeneous element distribution and isotropic volume expansion during cycling,resulting in persistent structural stability.Meanwhile,the disordered structure of amorphous material shortens the diffusion distance of lithium ions/electrons,promoting fast reaction kinetics and rate capability.Benefiting from the aforementioned effects,the amorphous Sb/C exhibits a high reversible capacity of537.4 m Ah·g-1at 0.1 A·g-1and retains 201.0 m Ah·g-1at an ultrahigh current rate of 10.0 A·g-1.Even after 1500deep cycles at 2.0 A·g-1,the amorphous Sb/C electrode still maintains 86.3%of its initial capacity,which outperforms all existing Sb-based anodes reported so far.Postmortem analysis further reveals a greatly reduced volume variation of merely 34.6%for the amorphous Sb/C electrode,much lower than that of 223.1%for crystalline Sb materials.This study presents a new approach to stabilizing Sb-based alloy anodes and contributes to the construction of high-performance amorphous anode materials for LIBs,enabling advanced energy storage.

关键词： Amorphous Sb/C anode Homogeneous element distribution Isotropic volume expansion Ultra-long cycle stability High-rate capability Lithium-ion battery

Structural Optimization of Polyimide Foam via Composition with Hyperbranched Polymer Modified Fluorinated Carbon Nanotubes

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Chinese Journal of Polymer Science 2023年第1期41卷 117-128页

作者： Jian Liu Zhuang Nie Rui Qin an-ping ou Tao Zhang Xu Wang Xiang-Yang Liu College of Polymer Science and Engineering State Key Laboratory of Polymer Material and EngineeringSichuan UniversityChengdu610065China Zhejiang Key Laboratory of Marine Materials and Protective Technologies Key Laboratory of Marine Materials and Related TechnologiesCASNingbo315000China

The key to improve the foam’s performance is to optimize the cellular structure and its bulk-material composition.Here,the hyperbranched polymer modified fluorinated multi-walled carbon nanotube(HPMCNT-F)based on the nucleophilic reactions of MCNT-F was successfully prepared and used to composite with PI foams.The pristine MCNT shows a poor dispersity and weak interfacial interaction with PI matrix.While HPMCNT-F exhibits an excellent dispersity and effectively forms covalent/non-covalent interaction with PI matrix due to the surface-structure engineering,resulting in the enhancement of the PI bulk.Furthermore,HPMCNT-F works as a heterogeneous nucleation agent in PI foam to optimize the cellular structure.The enhancement of PI bulk and the optimizing of cellular structure result in the increase of compressive special strength of composite foam by 58.9%with a low loading of 1.6 wt%HPMCNT-F.Moreover,the hyperbranched polymers effectively prevent the thermal conduction among HPMCNT-F,and the isolated MCNTs effectively block thermal radiation through absorption and reflection the infrared waves.Thus,the thermal conductivity was reduced by 8.0%simultaneously.

关键词： Foams Nanocomposites Mechanical properties Thermal properties

吗啉磺酰胺化合物的设计、合成及其抑制大豆萌芽活性的研究

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有机化学 2024年第1期44卷 309-315页

作者：黄志友杨平何波欧文霞袁思雨邵阳学院农林生态学院湖南邵阳422000 南京农业大学植物保护学院农作物生物灾害综合治理教育部重点实验室南京210095

为了发现新型脱落酸功能类似物,采用活性亚结构拼接原理设计了含吗啉磺酰胺片段的目标分子.以吗啉-4-磺酰胺和氟代硝基苯为起始原料,经芳基亲核取代反应合成了14个目标化合物,该合成方法操作简单,底物适用范围广.种子萌芽实验结果表明,... 详细信息

为了发现新型脱落酸功能类似物,采用活性亚结构拼接原理设计了含吗啉磺酰胺片段的目标分子.以吗啉-4-磺酰胺和氟代硝基苯为起始原料,经芳基亲核取代反应合成了14个目标化合物,该合成方法操作简单,底物适用范围广.种子萌芽实验结果表明,浓度为50µmol/L时4a~4d、4k、4m、4n等7个化合物处理后完全抑制萌芽,25µmol/L时4a~4d、4k、4m、4n等7个化合物处理后抑制率仍高于95%.进一步降低至15μmol/L时,发现4m、4n的抑制活性高于ABA和先导化合物PM4.分子对接结果表明,引入吗啉促使小分子中磺酰基(SO2)与Ser98形成氢键,提高了结合受体的能力,所以4m和4n的打分函数高于ABA和PM4,活性也更高.该结果有利于发现新型脱落酸功能类似物.

关键词：脱落酸功能类似物吗啉磺酰胺化合物抑制萌芽芳基亲核取代反应

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重庆地区地中海贫血患儿的临床分析

中国实验血液学杂志 2024年第1期32卷 214-218页

作者：欧容陈红霞余林刘玲周平重庆大学附属三峡医院儿科重庆404100

目的:分析重庆地区地中海贫血(地贫)患儿的基因型分布及血液学筛查特征。方法:以2021年1月至2022年10月就诊于重庆大学附属三峡医院的207例地贫患儿为研究对象,回顾性分析本地区地贫患儿的基因型分布及血液学筛查特征。结果:送检482份... 详细信息

目的:分析重庆地区地中海贫血(地贫)患儿的基因型分布及血液学筛查特征。方法:以2021年1月至2022年10月就诊于重庆大学附属三峡医院的207例地贫患儿为研究对象,回顾性分析本地区地贫患儿的基因型分布及血液学筛查特征。结果:送检482份样本中通过基因检测确诊地贫207例,总检出率42.95%,其中α地贫检出率为17.63%(85/482),β地贫检出率为24.27%(117/482),α复合β地贫检出率为1.04%(5/482)。本次α地贫共计检出5种基因突变类型,组成6种基因型,其中以αα/-SEA、αα/-α3.7最为常见;β地贫共计检出8种基因突变类型,组成9种基因型,其中以CD17/N、CD654/N、CD41-42/N最为常见。送检样本中年龄在0-3岁(57%)检出率最高,贫血程度主要为轻度(88.41%),MCV0.05)。β^(+)/β^(N)与β^(0)/β^(N)地贫患者的MCV、MCH、MCHC、RDW-SD组间比较均无统计学差异(P>0.05);--/αα地贫组MCV、RDW-SD均低于-α/αα地贫组,差异具有统计学意义(P0.05)。结论:重庆地区儿童地贫基因型具有多样性及异质性,且以轻度贫血为主;基因型不同的地贫患儿血液学指标存在差异。

关键词：儿童地中海贫血基因重庆地区

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半导体量子计算芯片

中国科学：信息科学 2024年第1期54卷 102-109页

作者：张建军李海欧郭国平中国科学院物理研究所北京100190 中国科学技术大学中国科学院量子信息重点实验室合肥230026 合肥国家实验室合肥230088

近年来,量子计算受到国内外越来越广泛的关注,美国、欧洲、日本和澳大利亚等国都投入了大量资金,量子计算应用研究成果开始涌现.在众多的量子计算物理系统中,半导体量子计算因具有与现有集成电路工艺兼容及可扩展、可集成的优点而备受重... 详细信息

近年来,量子计算受到国内外越来越广泛的关注,美国、欧洲、日本和澳大利亚等国都投入了大量资金,量子计算应用研究成果开始涌现.在众多的量子计算物理系统中,半导体量子计算因具有与现有集成电路工艺兼容及可扩展、可集成的优点而备受重视.本文在介绍国内外半导体量子计算研究进展的基础上,探讨半导体量子计算发展中面临的关键科学技术难题,以及未来半导体量子计算规模化、集成化、产线化的发展趋势.

关键词：硅锗量子点量子比特量子计算

Electric field dependence of spin qubit in a Si-MOS quantum dot

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Chinese Physics B 2024年第6期33卷 248-253页

作者：马荣龙倪铭周雨晨孔真真王桂磊刘頔罗刚曹刚李海欧郭国平 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Microelectronics Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Beijing Superstring Academy of Memory Technology Beijing 100176China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Origin Quantum Computing Company Limited Hefei 230026China

Valley, the intrinsic feature of silicon, is an inescapable subject in silicon-based quantum computing. At the spin–valley hotspot, both Rabi frequency and state relaxation rate are significantly enhanced. With protection against charge noise, the valley degree of freedom is also conceived to encode a qubit to realize noise-resistant quantum computing.Here, based on the spin qubit composed of one or three electrons, we characterize the intrinsic properties of valley in an isotopically enriched silicon quantum dot(QD) device. For one-electron qubit, we measure two electric-dipole spin resonance(EDSR) signals which are attributed to partial occupation of two valley states. The resonance frequencies of two EDSR signals have opposite electric field dependences. Moreover, we characterize the electric field dependence of the upper valley state based on three-electron qubit experiments. The difference of electric field dependences of the two valleys is 52.02 MHz/V, which is beneficial for tuning qubit frequency to meet different experimental requirements. As an extension of electrical control spin qubits, the opposite electric field dependence is crucial for qubit addressability,individual single-qubit control and two-qubit gate approaches in scalable quantum computing.

关键词： silicon-based quantum computing valley electric-dipole spin resonance

Correction to:Green Vertical-Cavity Surface-Emitting Lasers Based on InGaN Quantum Dots and Short

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Nano-Micro Letters 2024年第4期16卷 432-432页

作者： Tao Yang Yan‑Hui Chen Ya‑Chao Wang Wei ou Lei‑Ying Ying Yang Mei Ai‑Qin Tian Jian‑ping Liu Hao‑Chung Kuo Bao‑ping Zhang Laboratory of Micro/Nano‑Optoelectronics School of Electronic Science and EngineeringXiamen UniversityXiamen 361005FujianPeople’s Republic of China Suzhou Institute of Nano‑Tech and Nano‑Bionics Chinese Academy of SciencesSuzhou 215123JiangsuPeople’s Republic of China Department of Photonics National Yang Ming Chiao Tung UniversityHsinchu 30010TaiwanPeople’s Republic of China Semiconductor Research Center Honhai Research InstituteNew Taipei 220236TaiwanPeople’s Republic of China

Correction to:Nano-Micro Lett.(2023)15:223 https://***/10.1007/s40820-023-01189-0 In this article the author’s name“Hao-Chung Kuo”was incorrectly written as“Hao-Chung Guo”.And in the last sentence of the first pa... 详细信息

关键词： And has sentence

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哺乳期产妇钙磷代谢及骨密度变化

中华骨质疏松和骨矿盐疾病杂志 2024年第3期17卷 259-265页

作者：陈莹莹刘燕萍王鸥中国医学科学院、北京协和医学院、北京协和医院内分泌科国家卫生健康委员会内分泌重点实验室北京100730 中国医学科学院、北京协和医学院、北京协和医院临床营养科北京100730

哺乳期是机体钙磷代谢的一个特殊时期。在此阶段,母体钙磷和骨代谢状态在钙磷调节激素的作用下发生一系列变化,以期通过母乳为新生儿提供充足的钙质。本文就哺乳期产妇钙磷代谢及骨密度变化特点进行综述。研究表明,哺乳期间母体血钙水... 详细信息

哺乳期是机体钙磷代谢的一个特殊时期。在此阶段,母体钙磷和骨代谢状态在钙磷调节激素的作用下发生一系列变化,以期通过母乳为新生儿提供充足的钙质。本文就哺乳期产妇钙磷代谢及骨密度变化特点进行综述。研究表明,哺乳期间母体血钙水平保持正常,血磷水平轻度升高,同时,骨吸收和骨形成指标升高,并出现短暂性骨密度丢失,这些变化与升高的甲状旁腺激素相关蛋白(parathyroid hormone related protein,PTHrP)、泌乳素(prolactin,PRL)水平及低水平的雌二醇(estradiol,E2)有关。但随着停止哺乳、月经复潮,产妇骨代谢水平、骨密度逐渐恢复至孕前水平。

关键词：哺乳期钙磷代谢骨密度