CoOOH ultrathin nanoflake arrays aligned on nickel foam: fabrication and use in high-performance supercapacitor devices. Issue 33 (3rd August 2016)

• Record Type: Journal Article
• Authors: Zhang, Dongbin; Kong, Xianggui; Zhao, Yufei; Jiang, Meihong; Lei, Xiaodong
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 33(2016)
• Page Start: 12833
• Page End: 12840
• Publication Date: 2016-08-03
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta04413a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A CoOOH/NF ultrathin nanoflake array is fabricated by a facile two-step method. Furthermore, an asymmetric supercapacitor was assembled with CoOOH/NF and reduced graphene oxide, displaying excellent properties as energy storage devices. Abstract : CoOOH ultrathin nanoflake arrays grown on nickel foam (NF) have been fabricated by a two-step soft chemical procedure. The ultrathin nanoflakes with a thickness of about 2.7 nm were interconnected with each other and formed a loose and open 3D network structure, providing sufficient exposure of the active sites to an electrolyte. Moreover, the growth mechanism was also investigated. Furthermore, as a supercapacitor material, the CoOOH/NF electrode exhibited ultrahigh specific capacitance (2550 F g −1 at 1.25 A g −1 ) and good cycling stability (83% of its initial capacitance value was preserved after 5000 charge/discharge cycles at 10 A g −1 ). Meanwhile, an asymmetric supercapacitor device was assembled with CoOOH/NF as the positive electrode and reduced graphene oxide (rGO) as the negative electrode, displaying an energy density of 49.8 W h kg −1 at a power density of 435 W kg −1 . Furthermore, the capacitance retention of the asymmetric supercapacitor after 3000 cycles of charge–discharge at a current density of 7.7 A g −1 is 86%, showing good stability of the asymmetric pseudocapacitor.