Buming CHEN
,
Zhongcheng GUO
,
Hui HUANG
,
Xianwan YANG
,
Yuandong CAO
金属学报(英文版)
doi:10.1016/S1006-7191(08)60111-8
The α-PbO2 electrodes are prepared by anodic electrodeposition on A1/conductive coating electrode from alkaline plumbite solutions in order to investigate the effect of the different current densities on the properties of α-PbO2 electrodes. The physicochemical properties of the α-PbO2 electrodes are analyzed by using SEM, EDS, XRD, Tafel plot, linear sweep voltammetry (LSV) and A.C. impedance. A compact and uniform layer of lead dioxide was obtained at the current density of 3 mA·cm-2. A further increase in current density results in smaller particles with high porosity. EDS and XRD analyses have shown that the PbO2 deposited in alkaline conditions is highly non stoichiometric, and the PbO impurities are formed on the surface layer besides the α-PbO2 . The corrosion resistance of α-PbO2 at the low current density is superior to that of the high current density. It can be attributed to a porous layer of deposited films at high current densities. When used as anodes for oxygen evolution in aqueous Zn2+ 50~g·L-1, H2SO4 150~g·L-1, the Al/conductive coating/α-PbO2 exhibits lower potential compared to Pb electrode. Al/conductive coating/α-PbO2 electrode with the best electrocatalytic activity was obtained at current density of 1mA·cm-2. The lowest roughness factor was obtained at 1 mA·cm-2.
关键词:
Alpha lead dioxide
,
null
,
null
,
null
,
null
任鹏飞
,
邹小平
,
程进
,
张红丹
,
李飞
,
朱光
,
王茂发
材料科学与工程学报
doi:10.3969/j.issn.1673-2812.2007.06.024
本文介绍一种用电化学还原法制备氧化铅纳米棒的简单方法.实验中所用的电解液是混有氧氯化锆和三氯化钛的硝酸铅溶液,采用不锈钢片作为阴极和基底.在室温下,由直流电源供电,通过控制输出电流的大小在不锈钢片基底上沉积产物.氧化铅纳米棒的产生与电流密度有关,通过讨论,得出生成氧化铅纳米棒的最佳电流密度大小.用SEM、TEM、EDS和XRD对产物进行了表征.研究结果表明,所制备的氧化铅纳米棒是单晶结构.
关键词:
氧化铅
,
纳米棒
,
电化学还原
,
电流密度
杜贵平
,
李雄涛
,
姜立军
表面技术
doi:10.3969/j.issn.1001-3660.2010.01.026
针对电镀过程中由人为因素所引起的能耗问题,为提高镀件质量,节能降耗,研制了一种以高频开关电镀电源为核心的基于电流密度在线监控的电镀工艺过程控制系统.该系统由上位机、电流密度采集系统和数字化电镀电源装置组成,实现了电流密度的在线检测与控制.镀层变化和系统能耗实验表明:该系统实现了电镀工艺工程能量的合理配置,在额定输出范围内具有较低的单位能耗和较高的效率,工艺质量优良,对不同规格的电镀工件具有广泛的适应性.
关键词:
电流密度
,
在线监控
,
单位能耗
