A flexible all-solid-state micro-supercapacitor based on hierarchical CuO@layered double hydroxide core-shell nanoarrays
A flexible all-solid-state micro-supercapacitor based on hierarchical CuO@layered double hydroxide core-shell nanoarrays
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DOI：
10.1016/j.nanoen.2015.12.030
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发表时间：
2016-02-01
期刊：
影响因子：
17.6
通讯作者：
Duan, Xue
中科院分区：
文献类型：
--
作者：
Li, Zhenhua;Shao, Mingfei;Duan, Xue
柔性和轻质的线状超级电容器（WSSC）由于其在器件设计中的多功能性以及在便携式或可穿戴电子产品中的应用潜力而最近引起了越来越多的关注。然而，由于对具有复杂纳米结构的一维（1D）基底进行合理修饰的挑战，WSSC的性能相对较差，限制了其实际应用。在这里，我们证明了WSSC凭借材料探索和制造策略。通过对结构/形貌的精细控制，制备了以CuO纳米线为核、CoFe层状双氢氧化物（CoFe-LDH）纳米片为壳的一维纳米阵列电极，该电极具有比电容、高倍率性能和长循环寿命。基于这种复杂的核-壳纳米结构，制备了柔性全固态非对称WSSC，其表现出优异的超级电容性能，具有高能量密度（1.857 mWh cm（-3））和长期循环稳定性（在2000次循环中99.5%的器件电容保持率）。由于金属丝基底、过渡金属氧化物和LDHs材料的多功能性，本文提出的合成策略可以扩展到其他便携式和柔性微型储能器件的制造。(C)2016爱思唯尔有限公司版权所有
Flexible and lightweight wire-shaped supercapacitors (WSSCs) have recently attracted increasing interest, due to their versatility in the device design and application potentials in portable or wearable electronics. However, practical applications of WSSCs are still limited by the relatively poor performances, owing to the challenges in the rational modification of one-dimensional (1D) substrates with sophisticated nanostructure. Herein, we demonstrate a WSSC by virtue of material exploration and fabrication strategy. A 1D nanoarray electrode consisting of CuO nonowires core and CoFe-layered double hydroxide (CoFe-LDH) nanoplatelets shell supported on a copper wire is prepared with fine control over the structure/morphology, which displays a largely improved specific capacitance, high rate capability and long cycling lifespans. Based on this sophisticated core-shell nanostructure, a flexible all-solid-state asymmetric WSSC was fabricated, which exhibits excellent supercapacitive performances with a high energy density (1.857 mWh cm(-3)) and long-term cycling stability (99.5% device capacitance retention over 2000 cycles). By virtue of the versatility of metal wire substrates, transition metal oxides and LDHs materials, the synthesis strategy presented here can be extended to the fabrication of other portable and flexible micro energy storage devices. (C) 2016 Elsevier Ltd. All rights reserved.