Results 41 to 50 of about 1,222,854 (166)

Ionic‐Liquid‐Assisted Synthesis of NiTe/CoTe Heterostructure With Te Vacancies in N, P, and F Co‐Doped Hollow Carbon Nanorods for Efficient Alkaline Hydrogen Evolution and High‐Performance Flexible Supercapacitors

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi   +7 more
wiley   +1 more source

基于阻容网络的避雷器阻性电流计算方法研究

open access: yesGaoya dianqi, 2019
避雷器是目前防止雷击过电压最为有效的措施,其中应用最为广泛的避雷器类型就是氧化锌避雷器。阻性电流是对氧化锌避雷器的健康状态进行判断的重要依据,但是由于部分电容干扰,现有测量方式很难从全电流中准确得到阻性电流。文中以500 kV氧化锌避雷器为例,利用MATLAB中的Simulink模块对三相避雷器进行简化建模,考虑了避雷器的分节情况,考虑了各节之间的部分电容和各相之间的相间电容,得到了三相分节的避雷器阻容网络路模型,可以有效地滤除全电流中的容性分量,计算得到阻性电流。对于路模型中的各部分电容的取值 ...
马志伟   +5 more
doaj  

Multiscale Study of a Synergistic System in Carbon‐Coated Multimetal‐Based Selenides Toward Rapid and Highly Stable Sodium Storage

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The development of sodium‐ion batteries (SIBs) is limited by slow charge transfer kinetics and large material volume changes caused by the large radius of Na+. Leveraging the excellent physicochemical properties and unique heterostructures of metal selenides, ultrafine hetero‐CuFeSe2‐CoSe2 nanoparticles are in situ wrapped by ...
Ying Zhu   +5 more
wiley   +1 more source

H桥级联STATCOM直流侧电容电压平衡控制的研究

open access: yesGaoya dianqi, 2018
针对H桥级联静止同步补偿器(STATCOM)直流侧单电容电压波动引起相内及总体电压不平衡的问题,提出采用3种控制器协调控制的策略。直流侧单电容电压控制器为电压内环,单电容电压与参考电压作比较经过PI调节实现H桥单元电容电压平衡控制。直流侧总电压和无功电流控制器为电压、电流双环控制,总电容电压平方和与参考电压作比较经过PI调节实现总电容电压的平衡控制。同时提出一种获取无功参考电流的方法,该方法计算简单可有效提高系统运行的可靠性。H桥级联七电平STATCOM的仿真与实验表明 ...
汪玉凤, 段本涛, 赵维东
doaj  

A Molten Salt Strategy to Convert Bulk Nb2O5 Into 2D Nonlayered Niobium Nitride Nanosheets for Superior Pseudocapacitive Storage

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Two‐dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three‐dimensional chemical bonding.
Rui Huo   +7 more
wiley   +1 more source

一种石墨烯柔性复合电极、其制备方法及柔性超级电容器

open access: yes, 2017
本发明提供了一种石墨烯柔性复合电极、其制备方法及柔性超级电容器。本发明提供的石墨烯柔性复合电极包括:聚二甲基硅氧烷基底、三维石墨烯集流体和电极活性材料;所述三维石墨烯集流体的一部分填充于所述聚二甲基硅氧烷基底中,另一部分负载所述电极活性材料。本发明提供的柔性复合电极能够使柔性超级电容器和柔性微型超级电容器的比容量分别可达0.5~1F-cm2和30~50mF-cm2,且分别在反复弯曲折叠5000和2000次后容量保持率高于80%
周旭峰, 刘跃文, 刘兆平
core  

滤波电容器心子温度对可听噪声特性的影响机理研究

open access: yesGaoya dianqi, 2019
高压直流输电系统换流站中滤波电容器可听噪声问题受到日益关注。滤波电容器的可听噪声与其电场力激励和自身机械性能有关。在实际运行过程中,滤波电容器流过大量谐波电流,使得电容器内部心子温度升高,温度的变化会对电容器振动过程中的激励及机械性能产生影响。对此,文中开展了滤波电容器心子温度对可听噪声特性的影响研究,旨在全面认识影响电容器运行噪声的特性的因素。文中通过测量不同运行温度下电容器的噪声声功率级,发现电容器运行温度变化会影响电容器噪声的辐射。随着电容器运行温度的升高,声功率级有增大的趋势,尤其在10~40 ...
雷晓燕   +4 more
doaj  

Sodiumation of Biomass‐Derived Quinones Enables High‐Rate and Long‐Life Cathodes for Sodium‐Ion Batteries

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Biomass‐derived quinones are promising green and sustainable cathode materials for sodium‐ion batteries (SIBs), yet their practical application is hindered by poor cycling stability due to dissolution in conventional electrolytes. Herein, we demonstrate that sodiumation is an effective strategy to enhance both rate capability and cycling ...
Xinyue Zhu   +4 more
wiley   +1 more source

一种柔性超级电容器电极及其制备方法

open access: yes, 2017
本发明提供了一种柔性超级电容器电极,包括石墨烯纸以及复合于所述石墨烯纸的三维多孔石墨烯。本发明将石墨烯纸与三维多孔石墨烯进行紧密的复合制备柔性超级电容器电极,其中,前者主要承担电极集流体的作用,同时赋予电极良好的力学性能,后者具有孔结构且比表面积大,良好的离子扩散能力和电荷存储能力,赋予电极优异的电容特性,通过结合两种不同石墨烯结构在电极力学性能和能量存储上的优势 ...
周旭峰, 刘跃文, 刘兆平
core  

电流密度和温度对VRB性能的影响

open access: yes, 2009
利用千瓦级全钒液流电池(VRB)模块,考察了电流密度和温度等因素对VRB输出性能的影响。在1.000~1.550V的单体电池工作电压区间内,充电电流密度对容量的影响比放电电流密度大。随着温度从25℃降低至-5℃,VRB的极化从20mV/20mA·cm^2增加到40mV/20mA·cm^2;以80mA/cm^62和40mA/cm^2循环时,能量效率降低率分别约为0.32%/℃和0.06%/℃
孙晨曦, 陈剑, 张华民, 杨振坤
core   +1 more source

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