Template-free synthesis of one-dimensional hierarchical NiO nanotubes self-assembled by nanosheets for high-performance supercapacitors

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• 作者：Aifeng Liu ; Hongwei Che ; ^{hongweiche@hebeu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yuanxin Mao ; Yuqiao Wang ; Jingbo Mu ; Chunxia Wu ; Yongmei Bai ; Xiaoliang Zhang ; Guangshuo Wang
• 关键词：Nickel oxide ; Nanotube ; Assembly ; Supercapacitor
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：11435-11441
• 全文大小：3443 K

文摘

In this work, one-dimensional hierarchical NiO nanotubes from the self-assembly of nanosheets have been successfully prepared via a facile template-free solvothermal method followed by an annealing process. The as-synthesized NiO nanotubes have an internal tubular diameter of 350 nm and lengths of 2.0–4.0 μm. And a possible formation mechanism for hierarchical NiO nanotubes is also investigated. When used as electrode materials for supercapacitors, these NiO nanotubes exhibit a high specific capacitance of 919 F g⁻¹ at 1.0 A g⁻¹ and a specific capacitance retention of 94.7% after 2000 continuous charge–discharge cycles at 2.0 A g⁻¹. This superior electrochemical performance of NiO nanotubes electrode can be ascribed to the synergetic effect of its open tubular architectures and the short diffusion lengths in the nanosheets-based building blocks, allowing them to be a promising electrode material for supercapacitor applications.