共查询到16条相似文献,搜索用时 78 毫秒
1.
将分形几何与电化学原理相结合,通过改进的有限扩散凝聚模型(diffusion-limited aggregation,DLA),采用基于Microsoft Visual C 6.0编程,模拟温度对点电极电沉积结果的影响.以环形金属镍为阳极,石墨为阴极,用自行设计的试验设备研究了不同温度时金属镍二维电沉积生长的行为特性,并与模拟结果进行比较.结果表明:在保持电压恒定的条件下,温度对点电极电沉积的影响与采用DLA模型模拟所得的结果具有相似性,表明利用DLA模型模拟的结果对枝晶电沉积的试验研究具有很好的指导意义. 相似文献
2.
3.
介绍了喷射电沉积的基本原理,并根据喷射电沉积原理对凝聚扩散模型进行了改进,对电铸过程中的二维枝晶生长过程进行了数值模拟,并进行了实验验证.结果表明,利用改进的凝聚扩散模型模拟得到的粒子簇与实验获得的枝晶相似度较高,用该模型来说明枝晶的生长规律是真实的、可靠的.随着粒子相对运动速度的加快,得到的粒子簇的形貌由疏松分枝逐步发展为致密结构;在不同的粒子数目模拟枝晶图中表现出了明显的屏蔽效应;结合概率越小,粒子越容易进入内层生长点,使枝晶结构较致密;喷射高度对枝晶形貌的影响没有明显规律,波动性很强. 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
The electrodeposition behavior of nickel at glassy carbon(GC) and stainless steel(SS) electrodes in low temperature urea-acetamide-NaBr-KBr melt was investigated using cyclic voltammetry, chrono-amperometric current-time transients and scanning electron microscopy. Cyclic voltammograms and dimensionless chronoamperometric current-time transients analysis show that the electrodeposition of nickel is an irreversible process and proceeds via three-dimensional progressive nucleation with diffusion-controlled growth on both GC and SS substrates. Scanning electron microscopic analysis indicates the nickel deposits obtained on SS electrode are generally uniform, dense, and adherent to the substrate with rounded crystallites in the nanometer size regime. It is also found that the crystal structure of the electrodeposited nickel is independent on the deposition potential. The nickel deposits produced from the melt at higher cathodic potential exhibit larger grain size. 相似文献
12.
13.
14.
在超重力条件下电沉积镍箔,考察了超重力对镍箔沉积的电流效率、槽电压和单位能量消耗的影响,并对所制镍箔的表面形貌和晶体结构及机械性能进行了表征. 结果表明,随着重力系数G和沉积电流密度的增加,镍箔晶粒有细化的趋势. 所得镍箔抗拉强度由常重力(G=1)时的933 MPa增加到G=443时的1190 MPa,硬度则由224 Hv增加到375 Hv. 超重力条件下(G=111),随着沉积电流密度由0.1 A/cm2增加至0.4 A/cm2,镍箔的抗拉强度和硬度分别由1054 MPa和285 Hv增加为1121 MPa和331 Hv. 相似文献
15.
Roger Campbell Martin G. Bakker Claude Treiner Jean Chevalet 《Journal of Porous Materials》2004,11(2):63-69
High surface area electrodes are of much interest for various applications including electrochemical detectors, batteries, and fuel cells. The development of high surface area electrodes using liquid crystal templating to enhance the surface area of three-dimensional electrodes is reported. This method uses Brij 56, a nonionic surfactant, or Pluronic P123, a triblock copolymer, to template the electrodeposition of a mesoporous nickel film onto a foamed nickel electrode. This method is found to produce a 30–35 fold increase in surface area. XRD of Pluronic P123 templated nickel on gold surfaces shows a peak consistent with a pore to pore spacing of 7.5 nanometers. 相似文献
16.
用电沉积方法制备泡沫镍材料 总被引:3,自引:0,他引:3
泡沫镍是制造镉-镍电池和氢-镍电池的最佳电极材料之一,通过试验研制成功了用电沉积技术制备泡沫镍的工艺。所用基体材料为多孔的泡沫塑料,采用化学镀镍或浸导电胶两种方法均可制备导电层,经预镀镍便可在通用的硫酸盐镀镍电解液中电镀厚镍,后经灼烧,还原工序便可得到性能优良的泡沫镍材料。 相似文献