Results 81 to 90 of about 14,015 (179)

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

open access: yesRare Metals, EarlyView.
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

Synthesis and Properties of Self-healing Polymers and Electrically Conductive Composites Based on Hydrogen-bonding [PDF]

open access: yes, 2015
通过模仿生物体自愈合的特性,人工合成可自行感知和修复损伤的聚合物材料是一项富有深远意义的研究。目前聚合物材料在加工和使用过程中容易受到各种外界因素的破坏并产生难以监测的微裂纹,而这些微裂纹正是材料性能退化的起点。作为一种新颖的智能仿生材料,自修复聚合物能够感知并修复这类损伤,避免材料受到进一步破坏,延长材料使用寿命,消除安全隐患,节约维修成本。然而,目前研究的自修复高分子材料大多为绝缘体,使得其在导电领域中的应用受到限制。随着导电高分子材料在电子器件、传感器、能源、信息、航空等领域的广泛应用 ...
谢婷婉
core  

Hierarchical Strengthening Design in AlCrCuFeNi2.5/CuCrZr Composites Enables Strength–Ductility–Conductivity Synergy

open access: yesRare Metals, EarlyView.
ABSTRACT Developing Cu‐based composites that simultaneously achieve ultra‐high strength, ductility, and electrical conductivity remains critical for advanced electrical contact applications. In this work, multiphase AlCrCuFeNi2.5 high‐entropy alloy (HEA) reinforcements are incorporated into CuCrZr matrix via spark plasma sintering (SPS) and annealing ...
Tao Hong   +8 more
wiley   +1 more source

Synthesis and doping modification of high voltage LiNi0.5Mn1.5O4 cathode material [PDF]

open access: yes, 2015
目前商品化的锂离子电池的正极材料主要使用钴酸锂材料,但是钴酸锂材料面临钴的价格昂贵、资源缺乏以及污染环境等问题,同时钴酸锂也不能满足电动汽车等方面对动力锂离子电池在能量密度上的要求。尖晶石LiNi0.5Mn1.5O4材料是下一代锂离子电池正极材料的研究热点之一,具有147mAhg-1的理论比容量,以及高的充放电平台(4.7VvsLi/Li+),可以为电池提供平稳的工作电压,是很有应用前景的锂离子电池正极材料。但是作为锂离子电池正极材料,LiNi0.5Mn1.5O4仍然存在充放电循环性能差 ...
方俊川
core  

含硫添加剂对石墨负极低温性能的研究 [PDF]

open access: yes, 2018
锂离子电池的低温性能主要取决于石墨负极,通过添加剂来改善负极的低温性能是研究的焦点之一.本文比较了3种具有不同含硫官能团的添加剂DTD(ethylene sulfate)、1,3-PS(1,3-propane sultone)和ES(ethylene sulfite)对传统商业化材料人造石墨负极低温性能的影响.
吴则利, 张忠如, 杨勇, 郑烨珍
core   +1 more source

Bimetallic Mo/Fe‐Doped CoP2 Nanoleaf Array as a Bifunctional Electrocatalyst for Overall Water Splitting

open access: yesRare Metals, EarlyView.
ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng   +6 more
wiley   +1 more source

Co2O3添加物的作用及其对ZnO非线性电阻高电流区特性的影响

open access: yesDianci bileiqi, 1988
研究了Co2O3添加物对在高电流密度下电场电流密度特性的影响。随着Co2O3摩尔百分数的增加,由于ZnO颗粒的电导率减小,电压转折的位置下降到较低的电流密度。这是通过测定在高频下的阻抗证实的。根据电容—电压特性的分析指出,颗粒电导率的减小归因于由于填隙Zni或氧空缺V0浓度的减小而引起较低的载流子密度。在ZnO非线性电阻添加Co2O3量高于0.5mol%的情况下,载流子迁移率的降低增进了颗粒电导率的减小。
王振林
doaj  

Studies on the Ionization Rules of Metal Cluster Complexes Utilizating Mass Spectrometry with Electrospray Ionization Source (ESI-MS) [PDF]

open access: yes, 2016
金属团簇配合物的特殊性质,如显著的催化性、荧光性、手性,在人体健康、生物分析、分子检测和工业催化等领域具有巨大的应用或潜在应用价值。在金属团簇配合物的研究中,需要对其化学成分、结构进行快速、简便且准确地分析。质谱分析具有检测速度快、灵敏度高、化学特异性强等优点,结合检测得到准确的质核比m/z,电喷雾离子源飞行时间质谱(ESI-TOFMS)适合于表征金属团簇配合物。然而金属团簇配合物是一种复杂的无机-有机杂化体系,含有强度相对较弱的配位键,在电喷雾质谱检测中极易发生解离而得不到所需的分子离子峰 ...
王亚云
core  

Broad‐Spectral Response Lead Halide Perovskite Solar Cells Through Integration of Multifunctional Organic Bulk‐Heterojunction and Quantum‐Cutting Downconversion Materials

open access: yesRare Metals, EarlyView.
ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He   +9 more
wiley   +1 more source

盐雾对棒——板短空气间隙雷电冲击特性影响研究

open access: yesGaoya dianqi, 2018
目前国内雾霾天气对输电线路外绝缘的影响不容忽视,因此通过盐雾模拟雾霾天气,研究盐雾对短空气间隙雷电冲击击穿电压的影响具有重要实际意义。文中选择击穿电压最低的棒—板空气间隙为模型,分别对5、10、15 cm空气间隙,不同雾水电导率下进行雷电冲击电压击穿试验。结果表明,短空气间隙雷电冲击击穿电压受雾水电导率和空气间隙距离的共同影响,棒—板短空气间隙雷电冲击击穿电压随雾水电导率增大而减小,并且雾水电导率对击穿电压的影响程度随间隙距离增大而减小。通过粒子群算法(particleswarm ...
刘云鹏   +4 more
doaj  

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