Controlled growth of hierarchical nickel and cobalt hybrid inorganic–organic nanosheet-supported nanowires for energy storage. Issue 11 (2nd March 2017)

• Record Type: Journal Article
• Authors: Li, Yanhong; Peng, Huarong; Wei, Xijun; Xiao, Peng
• Is Part Of: CrystEngComm. Volume 19:Issue 11(2017)
• Page Start: 1555
• Page End: 1563
• Publication Date: 2017-03-02
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce00189d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Hexamethylenetetramine-induced growth of single-crystalline nickel and cobalt hybrid nanosheets–nanowires results in good electrochemical performance in battery-like energy storage devices. Abstract : Hierarchical nickel and cobalt inorganic–organic nanostructures on carbon fiber paper have been fabricated by a one-step hydrothermal approach directed by hexamethylenetetramine (HMT). The morphology and evolution of these single-crystalline inorganic–organic nanosheets–nanowires (IOSW) are investigated. Results show that HMT plays a vital role in the secondary growth of single-crystalline nanowires. Besides, HMT molecules intercalate within the interlayers of inorganic materials, forming single-crystalline organo-LDH (layered double hydroxide) nanosheets and organo-carbonate hydroxide nanowires. Furthermore, the electrode is employed for battery-like energy storage applications. The interconnected nanosheet–nanowire structure affords rich open spaces and efficient passways for ion diffusion and electron transport. A specific capacitance of 1308 F g −1 (1.7 F cm −2, at the current density of 4 mA cm −2 ) and excellent long-term cycling performance (94% retention after 10 000 cycles) are achieved. The high stability of the electrode could be attributed to the interactions between HMT and nickel/cobalt within the interlayer. In addition, a two-electrode device consisting of nickel and cobalt IOSW as the positive electrode and commercial active carbon as the negative electrode is fabricated and reaches a maximum energy density of 32.3 W h kg −1 (8 A g −1 ).