ساخت نانوکامپوزیت نیکل-کبالت-آلومینیوم/گرافن و بررسی عملکرد الکتروشیمیایی آن به عنوان ابرخازن

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

سمانه واحدی ¹ , مرتضی ثقفی یزدی ² , احمد رزاقیان آرانی ³

1 - کارشناس ارشد، دانشکده مهندسی مواد و متالورژی، دانشگاه بین المللی امام خمینی (ره)، قزوین
2 - استادیار، دانشکده مهندسی مواد و متالورژی، دانشگاه بین المللی امام خمینی (ره)، قزوین
3 - دانشیار، دانشکده مهندسی مواد و متالورژی، دانشگاه بین المللی امام خمینی (ره)، قزوین

تاریخ دریافت : 1399/07/30 تاریخ پذیرش : 1400/02/15 تاریخ انتشار : 1399/12/01

کلید واژه: نانوکامپوزیت, الکتروشیمی, گرافن, ابرخازن, هیدروترمال,

چکیده مقاله :

در این پژوهش، با بهره­گیری از روش هیدروترمال، الکترودهایی برای به کارگیری به عنوان ابرخازن ساخته شد. به کمک تغییر نسبت­ یون‌های فلزی Al⁺³/Co⁺²/Ni⁺² ، الکترود Al_0.5Co_0.5Ni₂O₄ با نسبت مولی 1:1:2 برای یون‌های Al⁺³/Co⁺²/Ni⁺² با بیشترین ظرفیت خازنی به دست آمد، که الکترود NiCoAl نامیده شد. با تغییر زمان (2، 5 و 20 ساعت) و دمای فرایند هیدروترمال (150 و 180 درجه سانتی‌گراد) عملکرد الکترودهای ساخته شده تغییر یافت و در نتیجه­ی آن، الکترود NiCoAl سنتز شده در دمای 150 درجه سانتی‌گراد برای مدت زمان 5 ساعت با ظرفیت F g^-1 1473 در چگالی جریان A g^-1 8 به عنوان بهترین الکترود ساخته شده معرفی شد. با افزودن گرافن به مواد سازنده الکترود، الکترود NiCoAl-rGO ساخته شده در دمای°C 150، ظرفیت بیشینه F g^-1 2362 در چگالی جریان برابر A g^-1 8 را از خود نشان داد. به کمک آنالیزهای ساختاری آزمون پراش اشعه X (XRD) و طیف فوریه مادون قرمز (FTIR) حضور مواد سازنده در ساختار تایید شد و با انجام آنالیز میکروسکوپ الکترونی-روبشی (FE-SEM)، ساختار نانو صفحه­ای و گل مانند الکترود NiCoAl و حضور گرافن در ساختار الکترود NiCoAl-rGO مشاهده شد. به منظور تشخیص چگونگی عملکرد الکتروشیمیایی، الکترودها تحت آزمون­های سیکل چرخه­ای (CV)، شارژ و دشارژ گالوانواستات (CD) و آزمون امپدانس الکتروشیمیایی(EIS) قرار گرفتند.

چکیده انگلیسی:

In this study, using Hydrothermal method, electrodes were synthesized to be used as supercapacitors.
Using the alteration ratio of Al+3/Co+2/Ni+2 metal ions, Al0.5Co0.5Ni2O4 electrode with a molar ratio of 1:1:2 for Al+3/Co+2/Ni+2 ions, the highest capacitance was obtained, which was called the NiCoAl electrode. With the change of time (2, 5 and 20 hours) and the temperature of the hydrothermal process (150 and 180 °C), the performance of the manufactured electrodes changed, and as a result, the NiCoAl electrode synthesized at 150 °C for a period of 5 h, the capacity of 1473 F g-1 in the current density of 8 A g-1 was obtained as the best electrode made. By adding graphene to the electrode's constituent materials, the NiCoAl-rGO electrode, synthesized at 150 °C showed a maximum capacity of 2364 F g-1 at a current density equal to 8 A g-1. With the help of structural analysis of X-ray diffraction test (XRD) and infrared spectrum (FTIR), the presence of constituent materials in the structure was confirmed, and the presence of graphene in the NiCoAl-rGO electrode structure was observed. In order to determine how electrochemical performance works, the electrodes were subjected to cycles (CV), Galvanostatic charge and discharge (CD), and electrochemical impedance (EIS) tests.

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