سنتز ریخت- کنترل‌شده نانومیله α-MnO2 در شرایط بی‌نیاز از قالب و بررسی رفتار خازنی الکتروشیمیایی نانوکامپوزیت آن با گرافن اکسید کاهش‌یافته

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه نانوفناوری، دانشکده فنی، دانشگاه گیلان، رشت، گیلان، ایران

چکیده

در این تحقیق، نانومیله‌های α-MnO2با یک روش جدید آب‌گرمایی ریخت- کنترل‌شده در شرایط بدون نیاز به قالب جهت کاربرد در ذخیره‌سازی الکتروشیمیای انرژی تهیه شد. اکسید گرافن با استفاده از روش هامر اصلاح شده تهیه شد. گروه‌های اکسیژن‌دار با استفاده از هیدرازین جهت تولید اکسید گرافن کاهش‌یافته حذف شدند. نانوکامپوزیت‌های اکسید گرافن کاهش‌یافته و دی‌اکسید منگنز با درصدهای مختلف (G80M20, G40M60, G20M80) ساخته شدند و با روش‌های مناسب با موفقیت مشخصه‌یابی شدند. برای بررسی رفتار خازنی الکتروشیمیایی نمونه‌های مختلف، آزمایش‌های ولتامتری چرخه‌ای ، شارژ/تخلیه گالوانوستاتیک در یک سیستم سه الکترودی با محلول Na2SO4 با غلظت 0/5 مولار به‌عنوان الکترولیت انجام شد. مطالعه طیف‌سنجی امپدانس الکتروشیمیایی و ولتامتری چرخه‌ای در محلول 10 میلی‌مولار K4[Fe(CN)6] حاوی KCl با غلظت 0/1 مولار برای مطالعه خواص سطحی الکترود انجام شد و نشان داد که الکترود G40M60 دارای کمترین مقاومت در برابر انتقال بار و نفوذ یونی می‌باشد. نتایج آزمایش‌های الکتروشیمیایی رفتار ابرخازنی عالی نانوکامپوزیت G40M60 و پایداری بالای 91 درصد پس از 50 چرخه شارژ-تخلیه در چگالی جریان Ag-1 5 را نشان داد. ظرفیت ویژه برای نانوکامپوزیت G40M60 بیشتر از سایر نمونه‌ها و معادل با Fg-1 179 /72 در چگالی جریان Ag-1 0/6 محاسبه شد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis of Template Free Morphology Controlled α-MnO2 Nanorod and Electrochemical Capacitive Study of its RGO Nanocomposite

نویسندگان [English]

  • N. Rouhi
  • S. Hassanpoor
Department of Nanotechnology, Faculty of Engineering, University of Guilan, Rasht, Iran
چکیده [English]

In this research, α-MnO2 nanorod was synthesized by a novel morphology controlled hydrothermal method in the absence of mold for electrochemical energy storage. Graphite oxide (GO) was synthesized using the modified Hummers method. The oxygenated groups of GO were eliminated by the use of hydrazine to produce the reduced graphene oxide (RGO). Nanocomposites with different percentages were made with reduced graphene oxide (G) and manganese dioxide (M) (G20M80, G40M60, G80M20) and were characterized successfully with appropriate methods. To investigate the electrochemical capacitor behavior of various samples, cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD) experiments were performed in a three-electrode system containing 0.5 M Na2SO4 solution as the electrolyte. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) study in 10 mM K4Fe(CN)6 containing 0.1 M KCl also investigated to evaluate the surface properties of the electrodes. The results of the electrochemical experiments showed that the G40M60 electrode had the lowest resistance to charge transfer and ionic diffiution. The results of electrochemical tests revealed excellent supercapacitor behavior of G40M60 nanocomposite and high stability of 91% after 50 charge-discharge cycles at 5 Ag-1 current density. The specific capacitance for the G40M60 nanocomposite was higher than that of other samples and was calculated as 179.72 F.g-1 in current density of 0.6 A.g-1.

کلیدواژه‌ها [English]

  • Electrochemical supercapacitor
  • Nanocomposite
  • MnO2
  • RGO
  • Hydrothermal

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مواد پیشرفته در مهندسی
دوره 42، شماره 3
آذر 1402
صفحه 31-48

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