Dandelion‐like Nanospheres Synthesized by CoO@CuO Nanowire Arrays for High‐Performance Asymmetric Supercapacitors. Issue 9 (5th May 2022)

• Record Type: Journal Article
• Authors: Li, Xiuzhen; Huang, Weiguo; Zhong, Yuxue; Liao, Leiping; Cheng, Yujun; Zheng, Kun; Liu, Jingquan
• Is Part Of: ChemElectroChem. Volume 9:Issue 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-05
• Subjects: oxygen vacancies -- CoO@CuO/Ni nanowire array -- asymmetric supercapacitors -- dandelion-like nanospheres -- energy storage; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202101623
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Recently, three‐dimensional‐structure materials have attracted enormous attention in energy‐storage fields on account of their excellent electrochemical performance. In this study, hierarchical nanospheres consisting of mesoporous CoO@CuO nanowires on a three‐dimensional conductive Ni foam are prepared by a one‐step hydrothermal method combined with a subsequent annealing process. Compared to CoO or CuO alone, the as‐obtained CoO@CuO/Ni hybrid nanowires show good electronic conductivity owning to the abundant existence of O vacancies in them. In a three‐electrode system, the area capacitance of the prepared CoO@CuO/Ni electrode reaches 2.94 F cm −2 (1.32 C cm −2 ) at 1 mA cm −2, and the CoO@CuO/Ni electrode presents an outstanding cycle performance. Moreover, a CoO@CuO/Ni//AC ASC asymmetric supercapacitor is fabricated and found to display a high energy density of 20.22 Wh kg −1 at 800 W kg −1 . Hence, this novel CoO@CuO/Ni hybrid nanowires with excellent electrochemical properties shows outstanding potential in the practical application of high‐energy storage devices. Abstract : Hierarchical nanospheres consisting of mesoporous CoO@CuO nanowires on a three‐dimensional conductive Ni foam are prepared by a one‐step hydrothermal method combined with a subsequent annealing process. Full solid‐state, asymmetric energy‐storage devices exhibiting superior energy‐storage properties are assembled for potential practical applications. This can be regarded as a promising electrode material for next‐generation energy‐storage equipment.