کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5149514 | 1497884 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Redox enhanced energy storage in an aqueous high-voltage electrochemical capacitor with a potassium bromide electrolyte
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Redox enhanced energy storage in an aqueous high-voltage electrochemical capacitor with a potassium bromide electrolyte Redox enhanced energy storage in an aqueous high-voltage electrochemical capacitor with a potassium bromide electrolyte](/preview/png/5149514.png)
چکیده انگلیسی
This paper reports a detailed electrochemical investigation of a symmetric carbon-carbon electrochemical device with a potassium bromide (KBr) electrolyte. Below 1.6Â V, KBr gives electrochemical double layer behavior. At higher voltages the Brâ/Br3â redox reaction comes into effect and enhances the energy storage. The redox-enhanced device has a high energy density, excellent stability, as well as high coulombic and energy efficiencies even at 1.9Â V. More importantly, the redox contribution can be “triggered” by pre-cycling at 1.9Â V, and remains beneficial after switching to 1.6Â V. The triggering operation leads to a 22% increase in stored energy with negligible sacrifice of power. The intriguing behavior is accompanied by a series of complex variations including the shifts of electrode potential limits and the shift of potential of zero voltage. The electro-oxidation of the positive electrode and kinetics of the Brâ/Br3â electrode reactions are proposed to be the main causes for the triggering phenomenon. These findings provide means to improve the design and operation of devices that contain bromine, or other redox species with a comparably high electrode potential.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 348, 30 April 2017, Pages 219-228
Journal: Journal of Power Sources - Volume 348, 30 April 2017, Pages 219-228
نویسندگان
Qi Li, Mazharul Haque, Volodymyr Kuzmenko, Namrata Ramani, Per Lundgren, Anderson D. Smith, Peter Enoksson,