Journal
CHEMICAL ENGINEERING JOURNAL
Volume 344, Issue -, Pages 311-319Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.03.061
Keywords
NiCo2O4@NiCo2O4; Three-dimensional; Nanocones; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China - China [21301007, 21301006]
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The highly ordered three-dimensional hierarchical NiCo2O4@NiCo2O4 core-shell nanocones arrays on nickel foams are synthesized by stepwise hydrothermal synthesis. The unique nanoarchitectures consist of a layer of NiCo2O4 nanosheets well coated on the surface of NiCo2O4 nanocones. When used in supercapacitors, the NiCo2O4@NiCo2O4 core-shell hierarchical nanostructures exhibit a remarkable capacitance of 2045.2 F g(-1) at a current density of 1 A g(-1), which are better than that of the individual components of NiCo2O4 nanosheets and NiCo2O4 nanocones. Furthermore, the predominant diffusion-controlled storage is revealed by theoretical analysis. An asymmetric supercapacitor device based on the hierarchical NiCo2O4@NiCo2O4 core-shell nanostructure and activated carbon is fabricated and exhibits a desirable high energy densities with a value of 82.95 Wh kg(-1) at power density of 0.35 kW kg(-1). These results indicate that the as-prepared NiCo2O4@NiCo2O4 are outstanding candidate for electrochemical supercapacitors.
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