سنتز میکروکره‌های کامپوزیتی Cr2O3/C با تغییر در پارامترهای ساخت و بررسی خواص الکتروشیمیایی آن‌ها

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

امیرحسین اسراری ¹ (مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران)
بهروز شایق بروجنی ² (استادیار، دانشکده فنی و مهندسی دانشگاه شهرکرد، شهرکرد، ایران)
حمید صفرزاده ³ (مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران)

تاریخ دریافت : 1394/10/20 تاریخ پذیرش : 1396/12/10 تاریخ انتشار : 1396/12/01

کلید واژه: Cr2O3, کربن, الکتروشیمیایی, سولوترمال, میکروکره,

چکیده مقاله :

در این پژوهش میکروکره‌های Cr₂O₃/C با استفاده از روش سولوترمال به صورت یک مرحله‌ای برای اولین بار تهیه شد. از آنالیز پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی SEM)) جهت مشخصه یابی محصولات سنتز شده مورد استفاده قرار گرفت. تعیین مقدار کربن در کامپوزیت با استفاده از آنالیز حرارتی (TGA) انجام شد. نتایج نشان می­دهد، کربن در کامپوزیت به صورت آمورف است و تنها پیک پراش Cr₂O₃را در الگوی XRD می­توان مشاهده نمود. اندازه بلورک‌های Cr₂O₃با استفاده از روش ویلیامسون-هال برابر 36 نانومتر محاسبه شد. محتوای کربن درکامپوزیت برابر 63 درصد وزنی محاسبه گردید. تصاویر حاصل از SEM نشان می‌دهد که سطح کره‌های تولید شده نسبتا صاف و میانگین قطر آن‌ها در حدود 2 میکرون می‌باشد. اندازه و مورفولوژی کره‌های کربنی می‌تواند با تغییر در شرایط واکنش سولوترمال کنترل شود و در محدوده 7/0 تا 5/3 میکرون تغییر کند. نتایج حاصل از آزمون امپدانس الکتروشیمیایی در محلول KOH برای میکروکره‌های Cr₂O₃/C دلالت بر رفتار خوب خازنی این ماده دارد. بهبود خواص الکتروشیمیایی Cr₂O₃/C نسبت به نانوذرات Cr₂O₃، به وجود کربن در کامپوزیت نسبت داده شد.

چکیده انگلیسی:

Nanostructured transition metal oxides have received Special role in the production of the anode electrode in the lithium-ion batteries. In this research, a one stage method to synthesize Cr₂O₃/Chybrid microspheres via solvothermal method was reported. The XRD and SEM methods were used for characterization of products. The Carbon content of synthesized samples were measured by TGA method. The results showed that only Cr₂O₃ peaks could be observed XRD patterns, and this  indicated that the carbon in the composite was amorphous. The average crystallite size is calculated by using Williamson-Hall, 36 nm. The content of carbon in the composite was 63 wt%. The SEM images showed that the surfaces of prepared spheres were relatively smooth and Carbon microspheres had an average diameter of about 2 μm. The morphologies and sizes of the microspheres change with controlled by reaction conditions Solvothermaland in the size range of 0.7-3/5 microns changes. Electrochemical impedance in KOH solution for Cr₂O₃/C indicates a good behavior Capacitive to materials. Cr₂O₃. Improve the electrochemical properties of the composite can be attributed to amorphous carbon.

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