Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992017 | Journal of Alloys and Compounds | 2018 | 24 Pages |
Abstract
Composite C@NiCo2O4 hollow microspheres (HSs) as electrode material were prepared via a two-step strategy of hard-template induced hydrothermal synthesis and calcination, in which SiO2@RF (resorcinol-formaldehyde resin, RF) sphere and hexamethylenetetramine (HMT) were used as hard template, and precipitant; Ni(NO3)2·6H2O and Co(NO3)2·6H2O as nickel and cobalt source, respectively. The resultant samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) patterns, XPS and N2 adsorption and desorption. The prepared C@NiCo2O4 material possess large specific surface area of 127.61â¯m2â¯gâ1 and porous structure. The electrochemical measurements show that the C@NiCo2O4 exhibit a large specific capacitance of 404â¯Fâ¯gâ1 at the current density of 1 A/g, a good cyclic stability with a capacitance retention of 87.1% after 1000 cycles of charge-discharge and a low resistance.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Wei Li, Feifei Yang, Zhonghua Hu, Yafei Liu,