In situ growth of NiCo₂S₄ nanotube arrays on Ni foam for supercapacitors: Maximizing utilization efficiency at high mass loading to achieve ultrahigh areal pseudocapacitance

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• 作者：Haichao Chen ; Jianjun Jiang ; Li Zhang ; D ; an Xia ; Yu ; ong Zhao ; Danqing Guo ; Tong Qi ; Houzhao Wan
• 关键词：Nanotube arrays ; Nickel cobalt sulfide ; Supercapacitors ; Asymmetric
• 刊名：Journal of Power Sources
• 出版年：15 May, 2014
• 年：2014
• 卷：254
• 期：Complete
• 页码：249-257
• 全文大小：3920 K

文摘

Self-standing NiCo₂S₄ nanotube arrays have been in situ grown on Ni foam by the anion-exchange reaction and directly used as the electrode for supercapacitors. The NiCo₂S₄ nanotube in the arrays effectively reduces the inactive material and increases the electroactive surface area because of the ultrathin wall, which is quite competent to achieve high utilization efficiency at high electroactive materials mass loading. The NiCo₂S₄ nanotube arrays hybrid electrode exhibits an ultrahigh specific capacitance of 14.39聽F聽cm^鈭? at 5聽mA聽cm^鈭? with excellent rate performance (67.7% retention for current increases 30 times) and cycling stability (92% retention after 5000 cycles) at a high mass loading of 6聽mg聽cm^鈭?. High areal capacitance (4.68聽F聽cm^鈭? at 10聽mA聽cm^鈭?), high energy density (31.5聽Wh聽kg^鈭? at 156.6聽W聽kg^鈭?) and high power density (2348.5聽W聽kg^鈭? at 16.6聽Wh聽kg^鈭?) can be achieved by assembling asymmetric supercapacitor with reduced graphene oxide at a total active material mass loading as high as 49.5聽mg. This work demonstrates that NiCo₂S₄ nanotube arrays structure is a superior electroactive material for high-performance supercapacitors even at a mass loading of potential application-specific scale.