检索结果-南通市图书馆

Co-doped IT-M0S2 nanosheets embedded in N,S-doped carbon nanobowls for high-rate and ultra-stable sodium-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第9期12卷 2218-2223页

作者： Peihao Li Yong Yang Sheng Gong Fan Lv wei Wang yiju Li Mingchuan Luo Yi Xing Qian Wang Shaojun Guo Department of Materials Science & Engineering College of EngineeringPeking UniversityBeijing 100871China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Center far Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China

Despite various 2H-MoS/carbon hybrid nanostructures have been constructed and committed to improve the performance for sodium-ion batteries(SIBs),they still show the limited cycle stability due to the relatively large volumetric expansion during the charge-discharge process Herein,we report the construction of cobalt-doped few-layered 1T-MoS2 nanosheets embedded in N,S-doped carbon(CMS/NSC)nanobowls derived from metal-organic framework(MOF)precursor via a simple in situ sulfurization *** unique hierarchical structure enables the uniformly dispersed Co-doped 1T-MoS2 nanosheets intimately couple with the highly conductive carbon nanobowls,thus efficiently preventing the *** particular,the Co-doping plays a crucial role in maintaining the integrity of structure for MoS2 during cycling tests,confirmed by first-principles *** with pristine MoS2,the volume deformation of Co-doped MoS2 can be shrunk by a prominent value of 52%during ***,the few-layered MoS2 nanosheets with 1T metalic phase endow higher conductivity,and thus can surpass its counterpart 2H semiconducting phase in battery *** virtue of the synergistic effect of stable structure,appropriate doping and high conductivity,the resulting CMS/NSC hybrid shows superior rate capability and cycle *** capacity of CMS/NSC can still be 235.9 mAh·g^-1 even at 25 A·g^-1,which is 51.3%of the capacity at 0.2 A·g^-***,the capacity can still remain 218.6 mAh·g^-1 even over 8,240 cycles at 5 Ag·g^-1 with a low decay of 0.0044%per cycle,one of the best performances among the reportec MoS2-based anode materials for SIBs.

关键词： sodium-ion battery anode IT-MoS2 cobalt-doping metal-organic framework(MOF)

A carbon-based 3D current collector with surface protection for Li metal anode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2017年第4期10卷 1356-1365页

作者： Ying Zhang Boyang Liu Emily Hitz wei Luo Yonggang Yao yiju Li diaqi Dai Chaoji Chen Yanbin Wang Chunpeng Yang Hongbian Li Liangbing Hu Department of Materials Science and Engineering University of Maryland College Park MD 20742 USA National Center for Nanoscience and Technology Beijing 100190 China

Lithium metal is considered the ideal anode material for Li-ion-based batteries because it exhibits the highest specific capacity and lowest redox potential for this type of cells. However, growth of Li dendrites, unstable solid electrolyte interphases, low Coulombic efficiencies, and safety hazards have significantly hindered the practical application of metallic Li anodes. Herein, we propose a three-dimensional （3D） carbon nanotube sponge （CNTS） as a Li deposition host. The high specific surface area of the CNTS enables homogenous charge distribution for Li nucleation and minimizes the effective current density to overcome dendrite growth. An additional conformal A1203 layer on the CNTS coated by atomic layer deposition （ALD） robustly protects the Li metal electrode/electrolyte interface due to the good chemical stability and high mechanical strength of the layer. The Li@ALD-CNTS electrode exhibits stable voltage profiles with a small overpotential ranging from 16 to 30 mV over 100 h of cycling at 1.0 mA·cm^-2. Moreover, the electrodes display a dendrite-free morphology after cycling and a Coulombic efficiency of 92.4% over 80 cycles at 1.0 mA·cm^-2 in an organic carbonate electrolyte, thus demonstrating electrochemical stability superior to that of planar current collectors. Our results provide an important strategy for the rational design of current collectors to obtain stable Li metal anodes.

关键词： lithium metal anode Coulombic efficiency current collector carbon nanotube interfacial protection stable cycling

Phosphatidylcholine protects against the hepatotoxicity of acrylamide via maintaining metabolic homeostasis of glutathione and glycerophospholipid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Yaoran Li wei Jia yiju Zhang Yong Wu Li Zhu Jingjing Jiao Yu Zhang Department of Gastroenterology， the First Affiliated Hospital， Zhejiang University School of Medicine，Zhejiang Key Laboratory for Agro-Food Processing， College of Biosystems Engineering and Food Science， Zhejiang University Department of Gastroenterology， the First Affiliated Hospital， Zhejiang University School of Medicine， Zhejiang Key Laboratory for Agro-Food Processing， College of Biosystems Engineering and Food Science， Zhejiang University College of Food Science and Technology， Yunnan Agricultural University College of Chemistry and Life Sciences， Sichuan Provincial Key Laboratory for Development and Utilization of Characteristic Horticultural Biological Resources， Chengdu Normal University Department of Nutrition， School of Public Health， Department of Clinical Nutrition of Affiliated Second Hospital， Zhejiang University School of Medicine

Acrylamide is classified as a Class 2A carcinogen and mainly metabolized to produce hepatotoxicity. Phosphatidylcholine is thought to protect the liver from damage， but the protective role of phosphatidylcholine on acrylamide-exposed metabolic disorders remains unclear. We investigated protective effect of phosphatidylcholine on the hepatic metabolism in rats exposed to acrylamide using metabolomics and molecular biology approaches. Overall， 32 endogenous effect biomarkers and 4 exposure biomarkers were identified as differential signature metabolites responsible for acrylamide exposure and phosphatidylcholine protection. Acrylamide exposure interferes with glutathione metabolism by consuming antioxidant glutathione， cysteine and L-ascorbic acid， and disrupts lipid and carbohydrate metabolism through reducing carnitine content and increasing lipid peroxidation. The phosphatidylcholine treatment reduces the expression of cytochrome P450 2E1， alleviates the oxidative stress and inflammation of the liver， and stabilizes the content of glutathione， and thus alleviates the disorder of glutathione. Meanwhile， phosphatidylcholine shifted acrylamide-induced phosphatidylcholine into lysophosphatidylcholine to storage from lysophosphatidylcholine to diacylglycerol， thereby maintaining metabolic homeostasis of glycerophospholipid. The results suggested that phosphatidylcholine supplementation alleviate the disorder of glutathione and lipid metabolism caused by acrylamide exposure， but not significantly change the levels of mercapturic acid adducts of acrylamide， providing the evidence for phosphatidylcholine protection against acrylamide-induced liver injury.

关键词：

基于MOFs材料的超疏水复合涂层的制备及其对碳钢的防腐蚀研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

材料导报 2021年第20期35卷 20068-20075页

作者：韦文厂刘峥魏润芝刁娜吕奕菊桂林理工大学化学与生物工程学院电磁化学功能物质广西区重点实验室桂林541004

利用三乙氧基-1H,1H,2H,2H-十三氟代正辛基硅烷(POTS)对合成的配合物Cu-MOF和Zn-MOF进行疏水性修饰,制备出Cu-MOF/POTS、Zn-MOF/POTS材料,然后利用红外光谱(FTIR)、扫描电镜(SEM)和能谱(EDS)等方法对其进行结构表征,并对其进行疏水性能... 详细信息

利用三乙氧基-1H,1H,2H,2H-十三氟代正辛基硅烷(POTS)对合成的配合物Cu-MOF和Zn-MOF进行疏水性修饰,制备出Cu-MOF/POTS、Zn-MOF/POTS材料,然后利用红外光谱(FTIR)、扫描电镜(SEM)和能谱(EDS)等方法对其进行结构表征,并对其进行疏水性能测试。结果表明,经POTS修饰后的Cu-MOF和Zn-MOF均从原来的亲水性转变为疏水性。将Cu-MOF/POTS、Zn-MOF/POTS作为防腐助剂添加到环氧树脂中制备出Cu-MOF/POTS/EP、Zn-MOF/POTS/EP复合涂层,它们表现出超疏水的效果,水接触角分别达到154.8°、153.1°,且涂层耐久性和耐水性试验均表明它们具有良好的耐久性能和耐水性能。将所制备的涂层浸在3.5%(质量分数)NaCl腐蚀溶液中进行电化学测试,极化曲线与电化学阻抗结果均表明Cu-MOF/POTS/EP、Zn-MOF/POTS/EP复合涂层对水分子和腐蚀介质起到协同阻隔和屏蔽作用,展现出很好的疏水和防腐蚀性能,防腐蚀效率分别达到90.06%、88.84%,能有效保护碳钢不受腐蚀,与扫描电镜分析结果相符。

关键词：金属有机框架材料防腐蚀碳钢超疏水涂层

2-氨基芴双希夫碱在模拟循环冷却水中对低碳钢的缓蚀性能

在线全文

学校读者我要写书评

暂无评论

材料导报 2021年第12期35卷 12196-12201页

作者：韦文厂刘峥魏润芝吕奕菊韩佳星张淑芬桂林理工大学化学与生物工程学院电磁化学功能物质广西区重点实验室桂林541004 大连理工大学精细化工重点实验室大连116024

通过溶液法,以2-氨基芴、吡啶-2,6-二甲醛、溴代丙二醛为原料,成功合成出2,6-二氨基吡啶缩2-氨基芴双希夫碱(A1)和溴代丙二醛缩2-氨基芴双希夫碱(A2),采用红外光谱、质谱分析等对A1和A2进行了结构表征,利用失重法、电化学测量技术、扫... 详细信息

通过溶液法,以2-氨基芴、吡啶-2,6-二甲醛、溴代丙二醛为原料,成功合成出2,6-二氨基吡啶缩2-氨基芴双希夫碱(A1)和溴代丙二醛缩2-氨基芴双希夫碱(A2),采用红外光谱、质谱分析等对A1和A2进行了结构表征,利用失重法、电化学测量技术、扫描电镜研究其在模拟循环冷却水中对低碳钢的缓蚀性能,并利用量子化学计算初步探讨了A1和A2的缓蚀机理。失重结果表明,A1和A2在温度为25℃、浓度为1.0 mmol·L^(-1)时,最能有效抑制模拟循环冷却水对低碳钢的腐蚀,其缓蚀效率分别为96.85%和93.46%。动电位极化曲线和交流阻抗谱结果均表明两种缓蚀剂有较好的缓蚀效率,且均为以阳极抑制为主的阳极型缓蚀剂。吸附研究表明A1和A2在低碳钢表面均遵循Langmiur吸附,ΔGadsθ值分别为-27.02 kJ·mol^(-1)、-29.03 kJ·mol^(-1),为混合型吸附。量子化学计算结果揭示了两种缓蚀剂分子结构中的吸附位点,且分子结构参数分析表明,A1的缓蚀效果优于A2。

关键词： 2-氨基芴模拟循环冷却水低碳钢双希夫碱吸附机理缓蚀性能

H-tensors and nonsingular H-tensors

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2016年第3期11卷 557-575页

作者： Xuezhong WANG Yimin wei School of Mathematical Sciences Fudan University Shanghai 200433 China School of Mathematics and Statistics Hexi University Zhangye 734000 China

The H-matrices are an important class in the matrix theory, and have many applications. Recently, this concept has been extended to higher order H-tensors. In this paper, we establish important properties of diagonally dominant tensors and H-tensors. Distributions of eigenvalues of nonsingular symmetricH-tensors are given. An J（t%-tensor is semi-positive, which enlarges the area of semi-positive tensor from H-tensor to H＋-tensor. The spectral radius of Jacobi tensor of a nonsingular （resp. singular） H-tensor is less than （resp. equal to） one. In particular, we show that a quasi-diagonally dominant tensor is a nonsingular H-tensor if and only if all of its principal sub-tensors are nonsingular H-tensors. An irreducible tensor H is an H-tensor if and only if it is quasi-diagonally dominant.

关键词： Diagonally dominant irreducible diagonally dominant H-tensor,nonsingular

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

水系钠离子电池正极材料及电解液研究进展

电源技术 2022年第10期46卷 1081-1087页

作者：鲁明峻吕奕菊李伟刘峥桂林理工大学化学与生物工程学院电磁化学功能物质广西区重点实验室广西桂林541004

水系钠离子电池是一种成本低、安全性高和环境友好的新一代电化学储能装置。但其较窄的电化学稳定窗口(<1.5 V)和较低的能量密度限制了其发展。因此,水系电池的研究重点应致力于拓宽水溶液电解质的稳定窗口,并寻找出更高容量的新型电极... 详细信息

水系钠离子电池是一种成本低、安全性高和环境友好的新一代电化学储能装置。但其较窄的电化学稳定窗口(<1.5 V)和较低的能量密度限制了其发展。因此,水系电池的研究重点应致力于拓宽水溶液电解质的稳定窗口,并寻找出更高容量的新型电极材料。综述了近年来国内外水系钠离子电极材料如聚阴离子化合物、过渡金属氧化物和普鲁士蓝类似物的研究进展,也对水系钠离子电池用电解液的研究工作做了总结,讨论了水系钠离子电池未来挑战和发展前景。

关键词：水系钠离子电池正极材料电化学性能电解质进展

On the Block Independence in G-Inverse and Reflexive Inner Inverse of A Partitioned Matrix

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第4期23卷 723-730页

作者： Yong Hui LIU Mu Sheng wei Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 P. R. China Department of Applied Mathematics Shanghai Finance University Shanghai 201209 P. R. China Department of Mathematics East China Normal University Shanghai 200062 P. R. China

By applying the multiple quotient singular value decomposition QQQQQ-SVD, we study the block independence in g-inverse and reflexive inner inverse of 2× 2 partitioned matrices, and prove a conjecture in [yiju Wang, S... 详细信息

关键词： G-inverse reflexive inner inverse partitioned matrices block independence QQQQQ-SVD

基于SAA7113H和HTV110的视频转换电路设计

在线全文

学校读者我要写书评

暂无评论

微计算机信息 2007年第29期23卷 256-257页

作者：王永华詹宜巨周卫林贵彬中山大学信息科学与技术学院广州510275 中山大学工学院广东省科学院自动化工程研制中心

本文介绍了一种基于SAA7113H和HTV110芯片的将模拟视频信号转换为VGA信号的电路,并给出了硬件连接图和部分程序初始化设置值。

关键词： SAA7113H HTV110 视频转换