کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10267346 | 459451 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and morphological investigation of pulsed current formed nano-structured lead dioxide
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
An electro-forming method was used for the preparation of nano-structured lead dioxide on lead substrate in 4.8 M H2SO4. A two electrode system composed of two similarly prepared lead electrodes was employed. A constant current was applied between two electrodes for a short time, followed by a relaxation period. A dark oxidation film of suitable stability and homogeneity was formed on the anode electrode. Different parameters including pulse height, pulse time (ton) and relaxation time (toff) were optimized. A change in morphology of lead dioxide from globular to nanofibriliar was observed when the pulse time and relaxation time varied from 0.01 to 10 and 0.1 to 5Â s, respectively, at a pulse height of 25Â mAÂ cmâ2. A variation in pulse height caused a variation in diameter and length of nanofibers formed at a pulsed time of 0.1Â s and relaxation time of 5Â s. The scanning electron microscopy (SEM) showed that lead dioxide particles obtained under these conditions have nanofibriliar morphology with an average diameter in the range between 20 and 50Â nm and length of 500-1000Â nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 7, Issue 12, December 2005, Pages 1257-1264
Journal: Electrochemistry Communications - Volume 7, Issue 12, December 2005, Pages 1257-1264
نویسندگان
Shahram Ghasemi, Hassan Karami, Mir Fazlollah Mousavi, Mojtaba Shamsipur,