Fabrication of Bi₂O₃||AC asymmetric supercapacitor with redox additive aqueous electrolyte and its improved electrochemical performances

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• 作者：S.T. Senthilkumar ; R. Kalai Selvan ; M. Ulaganathan ; J.S. Melo
• 关键词：Bismuth oxide ; Activated carbon ; Redox additive ; Redox reaction ; Energy density
• 刊名：Electrochimica Acta
• 出版年：1 January, 2014
• 年：2014
• 卷：115
• 期：Complete
• 页码：518-524
• 全文大小：2867 K

文摘

A new asymmetric supercapacitor (ASC) was fabricated using flower like 伪-Bi2O3as negative and bio-waste derived activated carbon (AC) as positive electrodes with Li2SO4as electrolyte. Here, the fabricated ASC was operated over the potential range of 0-1.6 V and evaluated by cyclic voltammetry (CV), galvano static charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) and cycle life. Further to improve the performance of ASC, KI was used as electrolyte redox additive with pristine (Li2SO4) electrolyte due to their possible redox reactions of iodine ions. Remarkably, a nearly threefold improved specific capacitance and energy density of 99.5 F g^鈭?and 35.4 Wh kg^鈭?respectively was achieved by adding of KI into Li₂SO₄ electrolyte, while it was only 29 F g^鈭?and 10.2 Wh kg^鈭?for pristine (Li2SO4) electrolyte used ASC at 1.5 mA cm^鈭?.