Ni(OH)2/NiO/Ni composite nanotube arrays for high-performance supercapacitors
Ni(OH)2/NiO/Ni composite nanotube arrays for high-performance supercapacitors
复制标题
用于高性能超级电容器的Ni(OH)2/NiO/Ni复合纳米管阵列
DOI：
10.1016/j.electacta.2014.12.066
复制
发表时间：
2015-02-01
影响因子：
6.6
通讯作者：
Cao, Chu-nan
中科院分区：
文献类型：
--
作者：
Dai, Xin;Chen, Dan;Cao, Chu-nan
过渡金属氧化物纳米结构是目前储能领域的研究热点之一。本文报道了一种新的无模板电化学方法在镍基底上制备Ni（OH）（2）/NiO/Ni复合纳米管阵列薄膜。通过调节前驱体溶液中Cu ~（2+）的浓度，可以有效地调节复合纳米管的内径。所构建的复合纳米管阵列膜电极是通过电化学方法使用含0.1M Cu 2+的前体溶液制备的，在15 A g（1）的电流密度下在10，000次充放电循环后提供1070 F g（1）的比电容。在150 A g（1）下的循环比电容为15 Ag（1）下的79.3%，表明其具有优异的倍率性能。循环电极在11.1 kW kg（1）的较大功率密度下呈现31.4 Wh kg（1）的高比能量密度。Ni（OH）（2）/NiO/Ni复合纳米管阵列电极优异的赝电容性能归因于其独特的结构特征。(C)2014爱思唯尔有限公司版权所有。
Transition metal oxide nanostructures are one of current investigation focuses for energy storage applications. We herein report a novel template-free electrochemical approach to fabricate Ni(OH)(2)/NiO/Ni composite nanotube array films on the nickel substrate. The inner diameter of the composite nanotubes can be effectively tuned by tailoring the concentration of Cu2+ in the precursor solutions. The as-constructed composite nanotube array film electrode, which is fabricated by the electrochemical approach using the 0.1 M Cu2+ containing precursor solution, delivers the specific capacitance of 1070 F g (1) at the current density of 15 A g (1) after 10,000 charge-discharge cycles. The specific capacitance of the cycled electrode at 150 A g (1) is as much as 79.3% of that at 15 Ag (1), demonstrating its excellent rate capability. The cycled electrode presents a high specific energy density of 31.4 Wh kg (1) at a larger power density of 11.1 kW kg (1). The excellent pseudocapacitive performance of the Ni(OH)(2)/NiO/Ni composite nanotube array electrodes can be attributed to their unique structure characteristics. (C) 2014 Elsevier Ltd. All rights reserved.