Facile fabrication of large-area hybrid Ni-Co hydroxide/Cu(OH)2/copper foam composites. (10th November 2016)

• Record Type: Journal Article
• Authors: Zhang, Dongbin; Shao, Yuan; Kong, Xianggui; Jiang, Meihong; Lei, Deqiang; Lei, Xiaodong
• Is Part Of: Electrochimica acta. Volume 218(2016)
• Page Start: 294
• Page End: 302
• Publication Date: 2016-11-10
• Subjects: Hybrid mixed metal hydroxide -- Hollow tubular structure -- Battery-type -- Hybrid supercapacitors -- Energy storage device; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.09.137
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Hybrid Ni-Co hydroxide nanoarrays with hollow tubular structure were prepared by a facile method. The prepared Ni-Co hydroxide/Cu(OH)2 /CF exhibits outstanding electrochemical performance as a battery-type electrode material for hybrid supercapacitors with ultrahigh specific capacity. Furthermore, an asymmetric supercapacitor (ASC) was fabricated with the Ni-Co hydroxide/Cu(OH)2 /CF as battery-type electrode while the rGO as the capacitor-type electrode, exhibiting a high energy density and can easy lighting the red LED. Highlights: A series of hybrids metal hydroxides nanoarray with hollow tubular structure is fabricated. The Ni-Co hydroxide/Cu(OH)2 /CF electrode exhibits ultrahigh specific capacity. Hybrid supercapacitor device composed of Ni-Co hydroxide/Cu(OH)2 /CF battery-type electrode and rGO capacitor-type electrode. High energy density of 58.61 Wh kg −1 at a power density of 359.33 W kg −1 . Abstract: In this work, we have developed a versatile method for hybrid Ni–Co hydroxide array fabricated on copper foam (CF). Starting from commercial copper foam, the process involves sequential solution immersion and electrolytic deposition steps, both of which are simple and rapid to carry out and potentially scalable. The resulting Ni–Co hydroxide/Cu(OH)2 /CF has a hierarchical and the nanoarray has a hollow structure, and exhibits outstanding electrochemical performance as battery-type electrode material for hybrid supercapacitors with excellent specific capacity (849.6 C g −1, at 5 mA cm −2 ) and good cycling stability (81.03% of its initial capacity value was preserved after 5000 charge/discharge cycles at 100 mA cm −2 ). Furthermore, an asymmetric supercapacitor was fabricated with the Ni-Co hydroxide/Cu(OH)2 /CF as positive electrode while the rGO as negative electrode. The hybrid device exhibits excellent energy density of 58.61 Wh kg −1 at a power density of 359.33 W kg −1 . Furthermore, we demonstrated that the process is also scalable in practice, by fabricating a large-size (20 cm × 30 cm) Ni–Co hydroxide/Cu(OH)2 /CF which retains excellent specific capacity.