Results 31 to 40 of about 37,606 (171)

Preparation of a new weakly acidic cation exchanger and the evaluation of cations by non-suppressed ion chromatography(新型弱酸性阳离子色谱柱的制备及非抑制型离子色谱法电导检测)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
制备出一种新型弱酸性非抑制电导检测阳离子色谱固定相,并通过对色谱条件的摸索选择,成功实现了常见一价、二价阳离子的分离检测,以及过渡金属离子Ni2+,Mn2+的分离检测.选用甲基磺酸溶液(2 mmol • L-1)和草酸(0.5 mmol• L-1)的混合液作为流动相,一步分离并测得了Li+、Na+、NH4+、K+、Mg2+、Ca2+ 6种阳离子的检测限和线性范围.选用酒石酸(2 mmol• L-1)和草酸(1 mmol • L-1)的混合溶液为流动相,成功分离并测得了过渡金属离子Ni2+,Mn2 ...
GUOYan-ru(郭龑茹)   +2 more
doaj   +1 more source

Preparation of Metal-organic Frameworks and Its Application in Lithium-ion Batteries [PDF]

open access: yes, 2015
近年来,随着新能源汽车市场的快速发展和人们对更长续航能力锂离子电池的需求,开发新一代高功率密度和高能量密度的锂离子电池材料成为当前研究领域的一个热点。金属有机框架材料(MOFs)是一类由金属离子与有机配体通过可逆的配位键形成的具有高度有序网络结构的2D或3D材料,因其独特的框架结构在储能领域有着潜在的应用前景。 本文围绕金属有机框架材料M3(HCOO)6及其复合材料在锂离子电池中的应用开展研究,主要内容如下: 1、采用液相扩散法合成了M3(HCOO)6(M=Co,Ni,Mn)材料 ...
林雄贵
core  

An Environmental‐Friendly and Sustainable Ramie‐Derived Co/N‐Doped Carbon With Dual Function for Synergistic Polysulfide Regulation in Li‐S Batteries

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The dual challenges of environmental sustainability and rising energy needs underscore the necessity for high‐energy‐density batteries, making lithium–sulfur (LSB) systems with their high theoretical capacity highly attractive. However, the polysulfide shuttle, coupled with inherent kinetic limitations in the sulfur reduction reaction ...
Bingbo Ni   +4 more
wiley   +1 more source

Technology development of titanium dioxide photocatalytic water-splitting for hydrogen production [PDF]

open access: yes, 2005
简单介绍了二氧化钛光催化分解水制氢的基本原理。综述了加入牺牲剂、碳酸钠、贵金属负载化、金属离子掺杂、阴离子掺杂、染料光敏化、半导体复合以及离子注入等提高二氧化钛光催化制氢的方法,讨论了这几种改性技术的机理以及对提高二氧化钛在可见光下的制氢效率的作用。重点讨论了阴离子掺杂和离子注入技术的机理和研究进展,指出离子注入是目前扩展二氧化钛光响应的最为有效的技术。最后讨论了光催化分解水制氢的氢氧分离问题,并通过与其他制氢技术的对比分析,指出光催化制氢将是通往氢经济的非常有潜力的制氢技术。The basic ...
Leung, M, Ni, M, Sumathy, K
core  

Multi‐Dimensional Characterization of Sodium‐Ion Battery Materials: Bridging Atomic Structure, Interface Chemistry and Electrochemical Performance

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Sodium‐ion batteries (SIBs) have emerged as promising candidates for large‐scale energy storage due to their cost‐effectiveness and resource abundance. However, challenges such as sluggish ion diffusion kinetics, structural degradation, and interfacial instability hinder their practical applications.
Yunze Wang   +7 more
wiley   +1 more source

一种“多针—网”结构的离子风特性研究

open access: yesGaoya dianqi, 2012
离子风在航天、环境、材料、能源和军事等领域有着广阔的应用前景。笔者依据电晕放电的原理,提出了一种"多针—网"的结构,成功实现了离子风的激发。在针电极电压为-4 310 V、网电极接地的实验条件下,该装置激发的离子风风速可达1.1 m/s。另外,笔者利用机械式法拉第筒对离子风进行了微电流检测,检测电流强度最高可达-10 nA,相比而言,加高压前的离子风装置的暗电流仅为-40 pA。实验结果表明,"多针—网"结构可以作为离子源使样品电离,并使大量的样品离子随离子风的流动而运动,完成样品离子的进样。因此,这种"
龚涛, 唐飞, 王晓浩
doaj  

核脊回归方法对核子分离能的描述

open access: yesHe jishu
核子分离能作为核子俘获或放出反应的反应能,对反应率起主导作用,继而会直接影响相关天体核合成过程。核脊回归(Kernel Ridge Regression,KRR)方法和考虑奇偶效应的核脊回归(Kernel Ridge Regression with odd-even effects,KRRoe)方法被应用到了核子分离能的描述中。通过分析在实验已知区域的描述精度和外推性能,详细对比讨论了两个方法对双中子分离能(S2n)、双质子分离能(S2p)、单中子分离能(Sn)和单质子分离能(Sp)的描述情况 ...
郭 粤颖   +3 more
doaj   +1 more source

Preparation and Characterization of Sulfur Modified Lithium Iron Silicates as Cathode Materials [PDF]

open access: yes, 2016
硅酸铁锂作为一种新型的聚阴离子型正极材料,具有原料丰富、结构稳定、理论容量高等优点,有望成为理想的动力电池正极材料。硅酸铁锂完全脱出两个锂离子对应的理论容量高达333mAh/g,但由于第二个锂离子的脱嵌电压过高和体积变化过大,硅酸铁锂只能脱出一个锂离子。硫改性能有效地降低硅酸铁锂的脱嵌电压和结构破坏,从而实现第二个锂离子的脱嵌,因此,有必要探索硫取代硅酸铁锂的合成方法,从而制备出高性能的硫取代硅酸铁锂正极材料。本论文采用溶胶-凝胶和固相烧结法,以硫脲作为硫源 ...
张存皓
core  

Bi/Bi2O3 Nanoparticles In Situ Embedded in Carbon as Anode Materials for Fast and Long‐Lasting Sodium–Ion Storage

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Bismuth anode materials are considered promising anode candidates for sodium–ion batteries (SIBs) due to their high theoretical capacity and appropriate working potential. Nevertheless, the significant volume expansion that occurs during the cycling process restricts its broader application in sodium–ion storage. Herein, Bi/Bi2O3 nanoparticles
Jiaju Lu   +3 more
wiley   +1 more source

直流盘形悬式绝缘子离子迁移测试系统的研究

open access: yesDianci bileiqi, 2007
对直流盘形悬式绝缘子离子迁移过程进行了分析,认为离子迁移微观上表现为绝缘子内部某些金属正离子和自由电子的定向迁移。直流绝缘子离子迁移试验测量系统采用51系列单片机及其保护系统,运用C++ Builder计算机语言设计了一套实用软件,实现了离子迁移试验的自动控制、测量及52路微电流、52路体电阻、累积电荷的在线监测和相应的数据处理,提高了直流绝缘子离子迁移试验的准确度和工作效率。
危鹏   +4 more
doaj  

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