عنوان المقالة:Co3O4/SiO2 nanocomposites for supercapacitor application
جمعه عبدالجواد محمد على | Gomaa A. M. Ali | 20545
نوع النشر
مجلة علمية
المؤلفون بالعربي
Gomaa A. M. AliOsama A. FouadSalah A. MakhloufMashitah M. YusoffKwok Feng Chong
الملخص العربي
In this study, Co3O4/SiO2 nanocomposites have been successfully synthesized by citrate–gel method by utilizing SiO2 matrix for Co3O4 embedment. Spectroscopy analyses confirm the formation of high crystalline Co3O4 nanoparticles; meanwhile, microscopy findings reveal that the Co3O4 nanoparticles are embedded in SiO2 matrix. Electrochemical properties of the Co3O4/SiO2 nanocomposites were carried out using cyclic voltammetry (CV), galvanostatic charge–discharge, and electrochemical impedance spectroscopy (EIS) in 5 M KOH electrolyte. The findings show that the charge storage of Co3O4/SiO2 nanocomposites is mainly due to the reversible redox reaction (pseudocapacitance). The highest specific capacitance of 1,143 F g −1 could be achieved at a scan rate of 2.5 mV s−1 in the potential region between 0 and 0.6 V. Furthermore, high-capacitance retention (>92 %) after 900 continuous charge–discharge tests reveals the excellent stability of the nanocomposites. It is worth noting from the EIS measurements that the nanocomposites have low ESR value of 0.33 Ω. The results manifest that Co3O4/SiO2 nanocomposites are the promising electrode material for supercapacitor application.
تاريخ النشر
18/05/2014
الناشر
Journal of Solid State Electrochemistry
رقم المجلد
18
رقم العدد
9
رابط DOI
https://doi.org/10.1007/s10008-014-2510-3
الصفحات
2505–2512
رابط الملف
تحميل (721 مرات التحميل)
رابط خارجي
https://link.springer.com/article/10.1007/s10008-014-2510-3/fulltext.html
الكلمات المفتاحية
Supercapacitor Energy storage Electrochemistry Nanocomposites Cobalt oxide
رجوع