Construction of Three-Dimensional Homogeneous NiCo2O4 Core/Shell Nanostructure as High-Performance Electrodes for Supercapacitors. Issue 12 (1st January 2015)

• Record Type: Journal Article
• Authors: Liu, Qi; Zhang, Xingming; Yang, Bin; Liu, Jingyuan; Li, Rumin; Zhang, Hongsen; Liu, Lianhe; Wang, Jun
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 12(2015)
• Page Start: E319
• Page End: E324
• Publication Date: 2015-01-01
• Subjects: Core/Shell structure -- Electrochemical Performance -- NiCo2O4 -- Three-dimensional; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0831512jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A novel three-dimensional homogeneous NiCo2 O4 core/shell nanowire arrays were first fabricated via a facile synthesis strategy on nickel foam as advanced binder-free electrodes. The structure and morphology of the as-synthesized samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray spectrometry (EDS) and transmission electron microscopy (TEM). This novel NiCo2 O4 /NiCo2 O4 core/shell nanowire arrays exhibited superior electrochemical performances, including high specific capacitance of 2041 F g −1 at current density of 5 mA cm −2, excellent rate performance with a capacitance retention of 88% as the current density increases from 5 to 50 mA cm −2 and good long-term cyclic stability. These outstanding electrochemical characteristics are mainly attributed to the superstructure, which provides a large number of electroactive sites for redox reaction, shortens the ion diffusion paths and enhances the morphological stability in the electrochemical process.