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β‐Ni(OH)2 Nanosheet Arrays Grown on Biomass‐Derived Hollow Carbon Microtubes for High‐Performance Asymmetric Supercapacitors
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-03-07 , DOI: 10.1002/celc.201800024
Qian Li 1, 2 , Chunxiang Lu 3 , Dengji Xiao 1, 2 , Huifang Zhang 1, 2 , Chengmeng Chen 1 , Lijing Xie 1 , Yaodong Liu 1 , Shuxia Yuan 3 , Qingqiang Kong 1 , Ke Zheng 1, 2 , Junqing Yin 1, 2
Affiliation  

The design and fabrication of biomass‐based energy storage devices is becoming a new trend to reduce the depletion of non‐renewable resources. Herein, β‐Ni(OH)2 nanosheet arrays grown on willow catkins‐derived hollow carbon microtubes is prepared for the first time through a facile acid treatment and subsequent hydrothermal process. In the β‐Ni(OH)2@acid‐treated carbon microtube [β‐Ni(OH)2@ACMT] composite, β‐Ni(OH)2 nanosheet arrays can be controllably grown on both internal and external surfaces of carbon microtubes, realizing effective utilization of the hollow tubular structure. In addition, carbon microtubes are not only employed as an effective support for the dispersion of β‐Ni(OH)2 nanosheets, but also served as a long‐range conductive micro‐current collector for electron transfer. Furthermore, the hollow tubular structure accompanied by the capillary effect provides fast channels for ion diffusion. As a consequence of this unique hierarchical structure, the electrode based on the β‐Ni(OH)2@ACMT composite exhibits a high specific capacitance of 1568 F g−1 at 1 A g−1, remarkable capacitance retention of 51.0 % even at 20 A g−1, and excellent cycling stability of 84.3 % retention after 3000 cycles. An asymmetric supercapacitor, with β‐Ni(OH)2@ACMT composites as the positive electrode and porous carbon microtubes as the negative electrode, achieves a high energy density of 37.8 W h kg−1 at 750 W kg−1, indicating its potential application in energy storage devices.

中文翻译:

生物高性能空心碳微管上生长的β-Ni(OH)2纳米片阵列,用于高性能非对称超级电容器

基于生物质的储能设备的设计和制造正成为减少不可再生资源消耗的新趋势。在本文中,通过轻度的酸处理和随后的水热工艺首次制备了在柳絮由柳絮制成的中空碳微管上生长的β-Ni(OH)2纳米片阵列。在经过β-Ni(OH)2酸处理的碳微管[β-Ni(OH)2 @ACMT]复合材料中,可以在碳微管的内外表面上可控地生长β-Ni(OH)2纳米片阵列。 ,实现了空心管状结构的有效利用。此外,碳微管不仅被用作分散β-Ni(OH)2的有效载体。纳米片,但也用作电子转移的长距离导电微集电器。此外,伴随毛细管效应的中空管状结构为离子扩散提供了快速通道。这种独特的分层结构的结果是,基于β-Ni(OH)2 @ACMT复合材料的电极在1 A g -1时显示出1568 F g -1的高比电容,甚至在5 A时也具有51.0%的显着电容保持率20 A g -1,在3000次循环后保持84.3%的出色循环稳定性。以β-Ni(OH)2 @ACMT复合材料为正极,多孔碳微管为负极的不对称超级电容器可实现37.8 W·h·kg的高能量密度-1在750 W kg -1时,表明其在能量存储设备中的潜在应用。
更新日期:2018-03-07
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