GITT studies on oxide cathode LiNi1/3Co1/3Mn1/3O2 synthesized by citric acid assisted high-energy ball milling

Layered LiNi_1/3Co_1/3Mn_1/3O₂ was synthesized by a citric acid assisted solid-state method. The structure and electrochemical properties of the LiNi_1/3Co_1/3Mn_1/3O₂ materials were investigated. XRD analysis indicated the as-synthesized LiNi_1/3Co_1/3Mn_1/3O₂ was with the layered α-NaFeO₂ structure. The discharge capacity was about 154 m·Ahg^???1 at 0·1 °C rate in the range of 2·0–4·5 V. The kinetics of the LiNi_1/3Co_1/3Mn_1/3O₂ materials was investigated by the galvanostatic intermittent titration technique (GITT) method. The lithium ion diffusion coefficient of the LiNi_1/3Co_1/3Mn_1/3O₂ was determined in the range of 10^???8??? 10^???9 cm²· s^???1 as a function of voltage of 3·7?4·5 V.     

Facile synthesis of Au/ZnO nanoparticles and their enhanced photocatalytic activity for hydroxylation of benzene

Au/ZnO nanocomposites have been prepared by a simple chemical method. For the first time, the nanocomposites were directly used as photocatalysts for hydroxylation of aromatic hydrocarbons under UV and visible light irradiation. The results show that the as-prepared photocatalysts display high photocatalytic activity for UV and visible catalytic hydroxylation of benzene. Without the assistance of any solvent or additive, high selectivity and high conversion efficiency were still obtained. Different photocatalytic mechanisms were proposed depending on whether excitation happens on ZnO semiconductor or on the surface plasmon band of Au. The former is Au nanoparticles act as electron buffer due to irradiation by UV light and ZnO nanoparticles as reactive sites for hydroxylation of benzene, the latter is that Au nanoparticles act as light harvesters and inject electrons into ZnO conduction band and as photocatalytic sites under visible light irradiation.     

CSS法制备CdZnTe薄膜时衬底温度的影响规律

采用近空间升华法(close-spaced sublimation,CSS),以CdZnTe化合物粉料为原料制备了CdZnTe薄膜,采用XRD、SEM、紫外光谱仪等对其进行了性能表征,并研究了不同生长温度对薄膜生长速率、结构、Zn含量和光学特性的影响规律.研究结果表明,薄膜的生长速率随着生长温度的升高而增大,且温度>5...     

Ⅱ-Ⅵ族化合物半导体量子结构材料和器件的研究与发展

简要介绍了量子结构材料与器件中的基本概念,重点介绍了量子结构的定义和量子尺寸效应的能带裁剪工程。以II-VI族化合物半导体为例,介绍了量子尺寸效应对于激子束缚能的影响。以此为基础,综述了II-VI族化合物半导体量子阱、量子点等量子结构材料以及量子结构器件在光电探测、发光器件与太阳能电池领域的研究现状,并总结了II-VI族化合物半导体量子结构材料与器件的发展趋势。     

添加0.05％(La+Ce)对SnXCuNi焊料与Cu基板间界面组织的影响

在Sn-4.1X-1.5Cu-Ni焊料合金中添加0.05％(质量分数,下同)(La+Ce),对焊料/Cu焊点等温时效后其界面组织的变化规律以及界面金属间化合物的形成和生长行为进行分析研究,结果表明:随着等温时效时间的延长,Sn-4.1X-1.5Cu-Ni/Cu和Sn-4.1X-1.5Cu-Ni-0.05(La+Ce)/...     

板式电化学水处理装置在循环水处理中的应用

分析板式电化学水处理装置的工作原理,并结合具体的监测数据阐述了板式电化学水处理装置的优点及突破性的功能.     

舰载红外系统对反舰导弹探测能力的计算模型

通过分析反舰导弹的红外辐射特征,给出了不同气象条件和传输路径上红外大气传输的衰减方程,然后给出舰载红外系统对反舰导弹红外探测能力的计算模型.在模型的求导过程中,考虑了光机扫描型和凝视型两种红外系统的不同,结合影响探测能力的多种因素,进一步完善了光机扫描型和凝视型红外系统的作用距离方程和目标发现概率计算模型,可对不同气象...