Construct hierarchical electrode with NixCo3-xS4 nanosheet coated on NiCo2O4 nanowire arrays grown on carbon fiber paper for high-performance asymmetric supercapacitors
Construct hierarchical electrode with NixCo3-xS4 nanosheet coated on NiCo2O4 nanowire arrays grown on carbon fiber paper for high-performance asymmetric supercapacitors
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DOI：
10.1016/j.jpowsour.2017.05.051
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发表时间：
2017-08-15
影响因子：
9.2
通讯作者：
Liu, Hao
中科院分区：
文献类型：
--
作者：
Cao, Liujun;Tang, Gang;Liu, Hao
为了提高超级电容器的能量密度，采用先进的伪电容电极和非对称器件结构的策略是可行和有效的。本文报道了一系列Ni/Co摩尔比可控的NixCo(3-x)S(4)(即NiCo2S4和Ni2CoS4)纳米片状涂层的设计和合成方面的重大进展。值得注意的是，Ni2CoS4@NiCo2O4复合电极在1 mA cm(-2)时的最大放电重量电容为1501Fg(-1)，面电容为1.86F cm(-2)。此外，结合氮掺杂碳干凝胶负极，我们制备了1.6V的非对称超级电容器(Ni2CoS4@NiCo2O4//硝基掺杂碳干凝胶)，该器件在1.0MKOH电解液中的最大能量密度和功率密度分别为32.2Wh kg(-1)和2.5kW kg(-1)，并且具有良好的循环稳定性(类似于10,000次循环后87.6%的保持率)。(C)2017爱思唯尔B.V.保留所有权利。
In order to boost the energy density of supercapacitors, the strategy of using advanced pseudo-capacitive electrode and asymmetric device architecture is feasible and effective. Herein, we report a significant advance in the design and synthesis of a new hierarchically nanostructures with a series of controllable Ni/Co molar ratios of NixCo(3-x)S(4) (i.e., NiCo2S4 and Ni2CoS4) nanosheets coatings have in situ grown on NiCo2O4 nanowires arrays on a flexible carbon fiber paper (CFP). Remarkably, the hybrid Ni2CoS4@NiCo2O4 composite electrode delivers the highest discharge gravimetric capacitance of 1501 F g(-1), and areal capacitance of 1.86 F cm(-2) at 1 mA cm(-2). Furthermore, coupled with nitrogen-doped carbon xerogels anode, we have fabricated a 1.6 V asymmetric supercapacitor (Ni2CoS4@NiCo2O4// nitrogendoped carbon xerogels), such device delivers a maximum energy and power densities of 32.2 Wh kg(-1) and 2.5 kW kg(-1) in 1.0 M KOH electrolyte, respectively, and an excellent cycling stability (similar to 87.6% retention after 10,000 cycles). (C) 2017 Elsevier B.V. All rights reserved.