Facile fabrication of hierarchical film composed of Co(OH)2@Carbon nanotube core/sheath nanocables and its capacitive performance. Issue 67 (15th November 2018)

• Record Type: Journal Article
• Authors: Fang, Hua; Chen, Gaoyun; Wang, Lixia; Yan, Ji; Zhang, Linsen; Gao, Kezheng; Zhang, Yongxia; Wang, Lizhen
• Is Part Of: RSC advances. Volume 8:Issue 67(2018)
• Page Start: 38550
• Page End: 38555
• Publication Date: 2018-11-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra07031h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A uniform Co(OH)2 sheath was anchored on the surface of a conductive CNT by a facile strategy, exhibiting comparatively high specific capacitance and outstanding long cycle life stability. Abstract : A hierarchical film composed of Co(OH)2 @carbon nanotube (CNT) core/sheath nanocables (CCNF) was generated via a simple and rapid electrophoretic deposition method. It is found that the Co(OH)2 sheath was uniformly anchored on the surface of conductive CNT core. The Co(OH)2 sheath, with a thickness of ∼20 nm, was composed of numerous very tiny nanoparticles. Such a unique nanostructure endows the CCNF with a high surface area of 126 m 2 g −1 and a hierarchical porosity, resulting in a large accessible surface area for redox activity. As expected, the CCNF exhibits high specific capacitance and excellent rate performance. Its specific capacitance reached 1215 F g −1 under a low current density of 1 A g −1 and was maintained at 832 F g −1 when the current density was increased 20 times to 20 A g −1 . A high capacitance retention of 99.3% was achieved after 10 000 cycles at 1 A g −1 . Such intriguing capacitive behavior is attributed to the synergistic effect of the CNT core and the Co(OH)2 sheath.