نویسندگان
1 دانشگاه ملایر، دانشکده مهندسی، گروه مهندسی مواد، ملایر، ایران
2 پژوهشگاه مواد و انرژی، پژوهشکده سرامیک، کرج، ایران
چکیده
در این پژوهش، مواد فعال نانوساختار هیدروکسید دوگانهی لایهای ZnxNi1-x(OH)2 بهطور موفقیتآمیزی با استفاده از روش همرسوبی شیمیایی و به کمک پلیاتیلن-گلیکول که نقش جهتدهنده به ساختار را دارد، ساخته شدند. مشخصهیابی ساختاری با استفاده از تفرق اشعه X و طیف سنجی تبدیل فوریه مادون قرمز انجام شد و مورفولوژی مواد با استفاده ازمیکروسکوپ الکترونی روبشی گسیل میدانی به دست آمد. نتایج نشان میدهند که مواد به دست آمده دارای ساختاری متخلخل با دیواره-های نانومتری بوده و عمده ساختار کریستالی آنها فاز α است. بررسیهای الکتروشیمیایی با استفاده از آزمونهای ولتامتری چرخهای، شارژ- تخلیه جریان ثابت و چرخهپذیری نشان میدهند که ماده فعال Zn0.33Ni0.67(OH)2 دارای بیشترین ظرفیت ویژه اولیه معادل F g-1 926 در چگالی جریان A g-1 1 و ابقای ظرفیت حدود 98% پس از 100 چرخه شارژ و تخلیه است.
کلیدواژهها
عنوان مقاله [English]
Synthesis, characterization and electrochemical performance of ZnxNi1-x(OH)2 nanostructured layered double hydroxide active material for supercapacitors
نویسندگان [English]
- Mahdi Kazazi 1
- Simin Askari 1
- Mahya Naghdi 1
- Shahab Moghadas 2
1 Malayer University, Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer, Iran
2 Materials and Energy Research Center, Ceramic Division, Karaj, Iran
چکیده [English]
In this research, ZnxNi1-x(OH)2 nanostructured layered double hydroxide active materials were successfully synthesized by a chemical co-precipitation route using polyethylene glycol as the structure-directing reagent. Structural characterizations were performed using X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR), and morphology of materials was obtained by Field Emission Scanning Electron Microscopy (FESEM). The results show that the as-prepared materials have a porous structure with nanoscale walls and their crystal structure was mainly α-phase. Electrochemical experiments using cyclic voltammetry, galvanostatic charge-discharge and cyclability show that Zn0.33Ni0.67(OH)2 active material has the highest initial specific capacitance of 926 F g-1 at a current density of 1 A g-1 and a capacity retention of about 98% after 100 charge-discharge cycles.
کلیدواژهها [English]
- Supercapacitors
- nickel-zinc layered double hydroxide
- electrochemical performance
- Co-precipitation
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