Controllable Growth of Hierarchical NiCo2O4 Nanowires and Nanosheets on Carbon Fiber Paper and their Morphology-Dependent Pseudocapacitive Performances
Controllable Growth of Hierarchical NiCo2O4 Nanowires and Nanosheets on Carbon Fiber Paper and their Morphology-Dependent Pseudocapacitive Performances
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DOI：
10.1016/j.electacta.2014.04.070
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发表时间：
2014-07-01
影响因子：
6.6
通讯作者：
Ye, Fei
中科院分区：
文献类型：
--
作者：
Deng, Fangze;Yu, Lin;Ye, Fei
采用简单的溶剂热法在碳纤维纸(CFP)上生长了层次化的NiCo2O4纳米线和纳米片。用不同物理化学性质的溶剂(水或偏二甲醇)可以很容易地控制NiCo2O4的两种形貌，并评价了它们在超级电容器中的伪电容性能。结果表明，CFP负载的NiCo2O4纳米片在16Ag(-1)的电流密度下具有较高的比电容(690Fg-1)，在10Ag(-1)的放电电流密度下2400次循环后的保持电容为87.1%。NiCo2O4纳米片的容量和循环稳定性的大幅提高可能归功于独特的层次化纳米片阵列结构，其具有更高的比表面积，为活性物种提供了更多的位置，并促进了电解液的快速渗透。此外，它还有利于在周期中更好地适应压力。(C)2014爱思唯尔有限公司。保留所有权利。
Hierarchical NiCo2O4 nanowires and nanosheets have been grown on carbon fiber paper (CFP) using a facile solvothermal route allowed by heat treatment. The two morphologies of NiCo2O4 can be easily controlled using solvents with different physicochemical properties (water or metanol) and their pseudocapacitive performances have been evaluated for supercapacitors applications. The results revealed that the CFP supported NiCo2O4 nanosheets exhibits high value of specific capacitance (690 F g(-1)) at current density of 16 A g(-1) and the retained capacitance was 87.1% after 2400 cycles at the discharge current density of 10 A g(-1). The much improved capacity and cycling stability of NiCo2O4 nanosheets may be attributed to the unique hierarchical nanosheets array structures, which has higher specific surface area, providing more sites for the active species and facilitating the fast penetration of electrolyte. Moreover, it also favors better accommodation of strain during the cycle. (C) 2014 Elsevier Ltd. All rights reserved.