纳米棒
电化学
超级电容器
电极
材料科学
氢氧化物
化学工程
电容
电流密度
热液循环
化学
无机化学
纳米技术
物理化学
物理
量子力学
工程类
作者
Ying Liu,Xueying Cao,Liang Cui,Yuxue Zhong,Rongkun Zheng,Di Wei,Colin J. Barrow,Joselito M. Razal,Wei Yang,Jingquan Liu
标识
DOI:10.1016/j.jpowsour.2019.226897
摘要
Here we report the development of a high-performance electrode material composed of Zn and Ni co-substituted Co carbonate hydroxide (ZnNi-Co 2 (CO 3 )(OH) 2 ) nanothorns branched on Cu(OH) 2 nanorods array (Cu(OH) 2 @ZnNi-Co 2 (CO 3 )(OH) 2 ), which are grown directly on copper foam current collector. The electrode materials are obtained by a simple in situ oxidation reaction and a hydrothermal strategy. The as-obtained Cu(OH) 2 @ZnNi-Co 2 (CO 3 )(OH) 2 electrode exhibits significantly enhanced electrochemical performance with a high specific capacitance (2746 F g −1 at 1 A g −1 ), and extraordinary cycling stability (maintained 95.61% of the initial capacitance after 6000 cycles at 20 A g −1 ), which are much superior to those of Cu(OH) 2 , Cu(OH) 2 @ Co 2 (CO 3 )(OH) 2 , Cu(OH) 2 @Ni-Co 2 (CO 3 )(OH) 2 , and bare ZnNi-Co 2 (CO 3 )(OH) 2 nanospheres electrodes. Additionally, the Cu(OH) 2 @ZnNi-Co 2 (CO 3 )(OH) 2 nanorods array can also be utilized as the positive electrode to fabricate an asymmetric supercapacitor device with an active carbon negative electrode, realizing a high cell voltage of 1.5 V and the energy density of up to 34.75Wh kg −1 at a power density of 375 W kg −1 . The excellent electrochemical properties can be credited to the three-dimensional hierarchical core-shell architecture. • Hierarchical Cu(OH) 2 @ZnNi-CoCH nanorods array is fabricated on 3D Cu foams. • The materials are obtained by an oxidation reaction and a hydrothermal strategy. • Cu(OH) 2 @ZnNi-CoCH electrode exhibits superb supercapacitive performance.
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