Open AccessSelf-Assembly of 3D Fennel-Like Co3O4 with Thirty-Six Surfaces for High Performance Supercapacitor
Author(s) -
Yanfang Li,
Zhenyin Hai,
Xiaojuan Hou,
Huibin Xu,
Zengxing Zhang,
Danfeng Cui,
Xue Chen,
Binzhen Zhang
Publication year - 2017
Publication title -
journal of nanomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.463
H-Index - 66
eISSN - 1687-4129
pISSN - 1687-4110
DOI - 10.1155/2017/1404328
Subject(s) - materials science , supercapacitor , cyclic voltammetry , scanning electron microscope , dielectric spectroscopy , capacitance , electrochemistry , cobalt oxide , electrolyte , potassium hydroxide , raman spectroscopy , chemical engineering , nickel , specific surface area , analytical chemistry (journal) , cobalt hydroxide , electrode , cobalt , composite material , metallurgy , organic chemistry , chemistry , physics , optics , engineering , catalysis
Three-dimensional (3D) fennel-like cobalt oxide (II, III) (Co3O4) particles with thirty-six surfaces on nickel foams were prepared via a simple hydrothermal synthesis method and its growth process was also researched. The crystalline structure and morphology were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The Brunauer-Emmett-Teller (BET) analysis revealed that 3D fennel-like Co3O4 particles have high specific surface area. Therefore, the special structure with thirty-six surfaces indicates the good electrochemical performance of the micron-nanometer material as electrode material for supercapacitors. The cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the electrochemical performances. Compared with other morphological materials of the similar sizes, the Co3O4 particles on nickel foam exhibit a high specific capacitance of 384.375 F·g−1 at the current density of 3 A·g−1 and excellent cycling stability of a capacitance retention of 96.54% after 1500 galvanostatic charge-discharge cycles in 6 M potassium hydroxide (KOH) electrolyte