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Facile growth of homogeneous Ni(OH)2 coating on carbon nanosheets for high-performance asymmetric supercapacitor applications
Nano Research ( IF 9.5 ) Pub Date : 2017-07-25 , DOI: 10.1007/s12274-017-1621-4
Mingjiang Xie , Zhicheng Xu , Shuyi Duan , Zhengfang Tian , Yu Zhang , Kun Xiang , Ming Lin , Xuefeng Guo , Weiping Ding

The growth of a Ni(OH)2 coating on conductive carbon substrates is an efficient way to address issues related to their poor conductivity in electrochemical capacitor applications. However, the direct growth of nickel hydroxide coatings on a carbon substrate is challenging, because the surfaces of these systems are not compatible and a preoxidation treatment of the conductive carbon substrate is usually required. Herein, we present a facile preoxidation-free approach to fabricate a uniform Ni(OH)2 coating on carbon nanosheets (CNs) by an ion-exchange reaction to achieve the in situ transformation of a MgO/C composite to a Ni(OH)2/C one. The obtained Ni(OH)2/CNs hybrids possess nanosheet morphology, a large surface area (278 m2/g), and homogeneous elemental distributions. When employed as supercapacitors in a three-electrode configuration, the Ni(OH)2/CNs hybrid achieves a large capacitance of 2,218 F/g at a current density of 1.0 A/g. Moreover, asymmetric supercapacitors fabricated with the Ni(OH)2/CNs hybrid exhibit superior supercapacitive performances, with a large capacity of 198 F/g, and high energy density of 56.7 Wh/kg at a power density of 4.0 kW/kg. They show excellent cycling stability with 93% capacity retention after 10,000 cycles, making the Ni(OH)2/CNs hybrid a promising candidate for practical applications in supercapacitor devices.

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中文翻译:

均匀生长Ni(OH)的便捷生长2个 用于高性能不对称超级电容器的碳纳米片上的涂层

在导电碳基材上生长Ni(OH)2涂层是解决与电化学电容器应用中导电性差有关的问题的有效方法。但是,在碳基底上直接生长氢氧化镍涂层是有挑战性的,因为这些系统的表面不相容,并且通常需要对导电碳基底进行预氧化处理。在这里,我们提出了一种简便的无预氧化方法,通过离子交换反应在碳纳米片(CNs)上制备均匀的Ni(OH)2涂层,以实现MgO / C复合材料原位转化为Ni(OH)2 / C 1。所获得的Ni(OH)2/ CNs杂化物具有纳米片形态,大表面积(278 m 2 / g)和均匀的元素分布。当在三电极配置中用作超级电容器时,Ni(OH)2 / CNs杂化物在1.0 A / g的电流密度下可达到2,218 F / g的大电容。此外,用Ni(OH)2 / CNs杂化体制成的不对称超级电容器表现出优异的超级电容性能,在功率密度为4.0 kW / kg时,容量为198 F / g,能量密度为56.7 Wh / kg。它们显示出卓越的循环稳定性,在10,000次循环后具有93%的容量保持率,这使得Ni(OH)2 / CNs杂化物成为超级电容器器件实际应用的有前途的候选者。

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更新日期:2017-07-25
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