A flexible all-solid-state micro-supercapacitor based on hierarchical CuO@layered double hydroxide core–shell nanoarrays. (February 2016)

• Record Type: Journal Article
• Authors: Li, Zhenhua; Shao, Mingfei; Zhou, Lei; Zhang, Ruikang; Zhang, Cong; Han, Jingbin; Wei, Min; Evans, David G.; Duan, Xue
• Is Part Of: Nano energy. Volume 20(2016:Feb.)
• Page Start: 294
• Page End: 304
• Publication Date: 2016-02
• Subjects: Core–shell nanowire arrays -- Layered double hydroxides -- Copper wire -- Asymmetric wire-shaped supercapacitor; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2015.12.030
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Flexible and lightweight wire-shaped supercapacitors (WSSCs) have recently attracted increasing interest, due to their versatility in the device design and application potentials in portable or wearable electronics. However, practical applications of WSSCs are still limited by the relatively poor performances, owing to the challenges in the rational modification of one-dimensional (1D) substrates with sophisticated nanostructure. Herein, we demonstrate a WSSC by virtue of material exploration and fabrication strategy. A 1D nanoarray electrode consisting of CuO nonowires core and CoFe-layered double hydroxide (CoFe-LDH) nanoplatelets shell supported on a copper wire is prepared with fine control over the structure/morphology, which displays a largely improved specific capacitance, high rate capability and long cycling lifespans. Based on this sophisticated core–shell nanostructure, a flexible all-solid-state asymmetric WSSC was fabricated, which exhibits excellent supercapacitive performances with a high energy density (1.857 mWh cm −3 ) and long-term cycling stability (99.5% device capacitance retention over 2000 cycles).By virtue of the versatility of metal wire substrates, transition metal oxides and LDHs materials, the synthesis strategy presented here can be extended to the fabrication of other portable and flexible micro energy storage devices. Graphical abstract: A hierarchical nanoarray consisting of a CuO core and layered double hydroxide (LDH) shell was successfully synthesized by the electrodeposition of CoFe-LDH nanoplatelets on the surface of CuO nanowires. Based on this sophisticated core–shell nanostructure, a flexible all-solid-state wire-shaped supercapacitor (WSSC) was fabricated, which exhibited excellent supercapacitive performances. Highlights: Hierarchical CuO@CoFe-LDH nanowire arrays (NWAs) were successfully synthesized.. The as-obtained core–shell NWAs give a largely improved specific capacitance. A wire-shaped supercapacitor (WSSC) based on CuO@CoFe-LDH was developed. The synthesis strategy can be extended to the fabrication of other micro SCs.