Facile growth of hollow porous NiO microspheres assembled from nanosheet building blocks and their high performance as a supercapacitor electrode

Abstract

Self-assembled hollow flowerlike NiO as a promising supercapacitor material has been fabricated by a facile hydrothermal process and the formation mechanism of the flowerlike morphology is investigated.The structure and morphology of the NiO samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) etc. and the surface area of the NiO sample was analyzed by measuring its N 2 adsorption-desorption isotherms. The results indicated that the addition of P123 inhibited the grain growth of NiO, and with the assistance of P123, the nanoparticles assembled into flowers. The electrochemical properties were characterized by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The results suggest that the flowerlike NiO has good electrochemical reversibility and displays superior capacitive performance with large capacitance (619 F g −1 ), as well as excellent cycling stability after 1000 cycles.

Hydrothermal preparation and supercapacitive performance of flower-like WO3·H2O/reduced graphene oxide composite

“…Generally, transition metal (Ru, Mn, Ni, Co, and V) oxides have been http://dx.doi.org/10.1016/j.colsurfa.2015.06.040 0927-7757/© 2015 Elsevier B.V. All rights reserved. employed as pseudocapacitor electrodes and have shown good pseudocapacitive performances [3][4][5][6][7][8][9]. Moreover, it has been found that the electrochemical performances of the electrode materials are strongly dependent on their sizes, morphologies and structures.…”

3D hierarchical mesoporous roselike NiO nanosheets for high-performance supercapacitor electrodes

“…For example, a hollow porous flowerlike NiO nanostructure was synthesized by a hydrothermal process displays superior capacitive performance with large capacitance of 619 F g -1 at 5 mA cm -2 [13] ; The direct growth of uniform NiO nanoparticles on different substrates exhibit the high specific capacitance of 1386 F g -1 at 1 A g -1 [14] ; The fabrication of 1D…”

Approaching High‐Performance Supercapacitors via Enhancing Pseudocapacitive Nickel Oxide‐Based Materials

“…The hierarchical structure promotes contact at the electrode/electrolyte interface and provides more active sites for the oxidation–reduction reaction. Moreover, Fan et al44 compounded NiO precursors by a simple hydrothermal method, and then constructed hollow flower‐like NiO by self‐assembly. Electrochemical performance tests revealed that this NiO electrode material had good electrochemical reversibility with a capacitance of 619 F g −1 and retained outstanding cycling performance after 1000 cycles.…”