Template-free synthesis of one-dimensional hierarchical NiO nanotubes self-assembled by nanosheets for high-performance supercapacitors. Issue 9 (July 2016)

• Record Type: Journal Article
• Authors: Liu, Aifeng; Che, Hongwei; Mao, Yuanxin; Wang, Yuqiao; Mu, Jingbo; Wu, Chunxia; Bai, Yongmei; Zhang, Xiaoliang; Wang, Guangshuo
• Is Part Of: Ceramics international. Volume 42:Issue 9(2016)
• Page Start: 11435
• Page End: 11441
• Publication Date: 2016-07
• Subjects: Nickel oxide -- Nanotube -- Assembly -- Supercapacitor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.04.080
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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.