بررسی اثر فرایند آنیل بر ریزساختار و رفتار الکتروشیمیایی شبه خازن نانواکسید دوتایی منگنز - نیکل تولید شده به روش لایه‌نشانی آندی

نویسندگان

1 1- دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

2 2- دانشکده مهندسی شیمی و مواد (جولیوناتا)، دانشگاه پلی‌تکنیک میلان

چکیده

در پژوهش کنونی، نانو اکسید دوتایی منگنز - نیکل به روش پتانسیودینامیک در دمای اتاق بر روی فولاد زنگ نزن رسوب داده شد و اثر فرایند آنیل (در دمای 200 درجه سانتی­گراد، به مدت 6 ساعت) بر ریز ساختار و عمل­کرد الکتروشیمیایی شبه خازن تولیدی مورد مطالعه قرار گرفت. نتایج نشان از اثر قابل توجه فرایند آنیل در افزایش ظرفیت خازنی و هم چنین کاهش مقاومت انتقال بار الکترود داشت. تصاویر FESEM، وجود نانو ورقه­های پیوسته و تصادفی را در میکروساختار فیلم اکسیدی نشان داد. به علاوه، در فیلم اکسیدی لایه‌نشانی شده با میزان حدود 10 درصد اتمی نیکل در ترکیب آن، پس از فرایند آنیل، ساختار بلوری جزیی شامل فاز birnessite شش وجهی نامنظم شکل گرفت. براساس منحنی­های شارژ - دشارژ در جریان ثابت، بالاترین ظرفیت خازنی ( F g-1384) و انرژی ویژه (53 وات ساعت بر کیلوگرم) در جریان ویژه دشارژ 1/0 آمپر بر گرم برای الکترود اکسیدی آنیل شده به دست آمد. در نهایت، نتایج آزمون عمر سیکلی در جریان ویژه 10 آمپر بر گرم، حاکی از پایداری سیکلی عالی و افزایش حدود 23 درصدی ظرفیت خازنی ویژه شبه خازن تولیدی پس از اعمال 5000 سیکل شارژ - دشارژ در الکترولیت یک مولار سولفات سدیم بود.

کلیدواژه‌ها

عنوان مقاله [English]

Study on the Effect of Annealing Process on Microstructure and Electrochemical Behavior of the Binary Mn-Ni Nano-Oxide Pseudocapacitor Synthesized by Anodic Deposition

نویسندگان [English]

  • M. H. Tahmasebi 1
  • M. A. Golozar 1
  • K. Raeissi 1
  • M. A. Golozar 1
  • A. Vicenzo 2
  • M. Bestetti 2
1 1- Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
2 2- Department of Chemistry, Materials and Chemical Engineering
چکیده [English]

In the present investigation, Mn-Ni binary nano-oxide was deposited by potentiodynamic method on stainless steel at room temperature and the effect of annealing process (at 200 oC for 6 h) on microstructure and electrochemical performance of the synthesized pseudocapacitor was studied. The results showed the significant effect of annealing process on increasing the capacitance and decreasing the charge transfer resistance of the electrode. Field Emission Scanning Electron Miscroscopy (FESEM) images depicted interconnected and random nano-flakes in the oxide film microstructure. Moreover, a partially crystallized structure consisting disorder hexagonal birnessite type phase was formed upon annealing in the deposited oxide film with about 10 %at Ni in composition. Based on the galvanostatic charge-discharge plots, the highest specific capacitance (384 F g-1) and specific energy (53 Wh kg-1) were found at specific current of 0.1 A g-1 for the annealed oxide electrode. Finally, cycle life test results at specific current of 10 A g-1 showed an excellent cyclability and an increase of about 23% in specific capacitance of synthesized pseudocapacitor after 5000 charge-discharge cycles in 1 M Na2SO4.

کلیدواژه‌ها [English]

  • Mn-Ni binary nano-oxide
  • Pseudocapcitor
  • Potentiodynamic
  • annealing process
  • Nano-flake
  • Cycle life

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مواد پیشرفته در مهندسی
دوره 35، شماره 3
آذر 1395
صفحه 107-121

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