نویسندگان

دانشگاه ملایر، دانشکده مهندسی، گروه مهندسی مواد، ملایر، ایران.

چکیده

در این پژوهش مواد فعال نانوساختار اکسید کبالت و اکسید نیکل کبالت به روش هیدروترمال به‌طورموفقیت‌آمیزی سنتز شدند. مشخصه‌یابی مواد فعال تهیه شده توسط پراش اشعه (XRD) X، میکروسکوپ الکترونی روبشی گسیل میدانی (FE-SEM) و آنالیز عنصری (EDS) انجام شد. نتایج آزمون مشخصه یابی نشان دادند که نیکل به صورت موفقیت‌آمیزی در داخل ساختار اسپینل اکسید کبالت قرار گرفته است. هم‌چنین بررسی‌های میکروسکوپی نشان‌دهنده مورفولوژی نانو‌میله‌ای اکسید کبالت و اکسید نیکل کبالت هستند، که سطح ویژه بالایی را به منظور واکنش‌های الکتروشیمیایی جهت افزایش ظرفیت ذخیره‌سازی انرژی در اختیار قرار می‌دهند. عملکرد ذخیره‌سازی انرژی ماده‌ی فعال تهیه شده به عنوان ماده فعال شبه‌ابرخازن‌ها توسط آزمون‌های الکتروشیمیایی ولتامتری چرخه‌ای و آزمون شارژ/ تخلیه جریان ثابت در محلول شش مولار KOH در سل استاندارد Swagelok مورد بررسی قرار گرفت. ظرفیت ویژه خازنی نمونه حاوی نیکل (F g-1 1624) بسیار بالاتر از ظرفیت اکسید کبالت (F g-1 1020) در چگالی جریان A g-1 2 به‌دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis, Characterization and Electrochemical Performance of Nanostructured Cobalt Oxide and Nickel Cobalt Oxide Active Materials for Supercapacitors

نویسندگان [English]

  • Razieh Karami
  • Mahdi Kazazi

Malayer University, Department of Materials Engineering, Malayer, Iran.

چکیده [English]

 In this research, nanostructured cobalt oxide and nickel cobalt oxide active materials were successfully
synthesized by a hydrothermal route. Structural characterizations of the prepared active materials were performed using
X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and elemental analysis (EDS). The
results of these experiments showed that nickel has been successfully doped in the cobalt oxide spinel structure. Also,
the microscopic examination showed the nano-rod morphology for the cobalt oxide and nickel cobalt oxide, which
yields the high specific surface area for electrochemical reactions, leading to increase energy storage capacitance.
Energy storage performance of the prepared active materials was investigated using electrochemical experiments of
cyclic voltammetry and galvanostatic charge-discharge in a solution of 6 M KOH in Swagelok standard cell. The
specific capacitance of nickel containing cobalt oxide sample (1624 F g
-1) was obtained higher than that of cobalt oxide
(1020 F g
-1) at a current density of 2 A g-1. 

کلیدواژه‌ها [English]

  • Supercapacitors
  • electrochemical performance
  • Hydrothermal method
  • Cobalt oxide
  • nickel-cobalt spinel
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