High-yield synthesis of carbon nanotube-porous nickel oxide nanosheet hybrid and its electrochemical capacitance performance

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• 作者：Kai Dai ; Changhao Liang ; Jianming Dai ; Luhua Lu ; Guangping Zhu ; Zhongliang Liu ; Qinzhuang Liu ; Yongxing Zhang
• 关键词：Nanostructures ; Chemical synthesis ; Electrochemical techniques ; Electrochemical properties
• 刊名：Materials Chemistry and Physics
• 出版年：14 February, 2014
• 年：2014
• 卷：143
• 期：3
• 页码：1344-1351
• 全文大小：2501 K

文摘

This study reports an easy chemical conversion route toward large-scale fabrication of carbon nanotube (CNT)-porous nickel oxide (NiO) hybrid nanocomposites as supercapacitor electrode materials. The electrocapacitive performance of CNT-porous NiO hybrids is evaluated by cyclic voltammetry and galvanostatic charge-discharge measurements. The synthesized CNT-NiO hybrid nanocomposite electrode presents a high specific capacitance of 759聽F聽g^鈭? at 0.5聽A聽g^鈭? in 6聽M KOH aqueous electrolyte, which is almost twice that of pure NiO nanoparticle (388聽F聽g^鈭?) electrodes and nine times of that of commercial NiO particle (88.4聽F聽g^鈭?) electrodes. Furthermore, good capacitance retention is achieved after 1000 cycles of galvanostatic charge-discharge. The synergistic effects from the pseudocapacitance of porous NiO particles, good electrical conductivity, and open tip CNTs attribute to the high capacitance performance.