Capacitance performance of cobalt hydroxide-based capacitors with utilization of near-neutral electrolytes

详细信息    查看全文

• 作者：Fedor S. Fedorov ; ^{f.fedorov@ifw-dresden.de} ; Julia Linnemann ; Kristina Tschulik ; Lars Giebeler ; Margitta Uhlemann ; ^{m.uhlemann@ifw-dresden.de} ; Annett Gebert
• 关键词：Cobalt hydroxide ; Supercapacitor ; Neutral electrolyte ; Integral capacitance ; Differential capacitance
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：15 February, 2013
• 年：2013
• 卷：90
• 期：Complete
• 页码：166-170
• 全文大小：815 K

文摘

Conventional alkaline solutions used for capacitive performance of electrodeposited cobalt hydroxides have a number of disadvantages as they are corrosive, environmentally unfriendly and provide a small working potential range. In this study, the capacitive properties of electrodeposited cobalt hydroxide/oxide were investigated in 1 M Na₂SO₄ solution with pH 5.5 by means of cyclic voltammetry, galvanostatic charging/discharging experiments and electrochemical impedance spectroscopy. The capacitance of the cobalt hydroxide/oxide was demonstrated to have high values of 141 F g^?1 at scan rate 8 mV s^?1 in this 1 M Na₂SO₄ solution. The anodic potential range is extended by 0.8-1.3 V vs. Ag/AgCl. A good cyclic stability and reversibility were observed.