Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 722, Issue -, Pages 903-912Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.06.138
Keywords
NiCo2O4 nanorod; Nitrogen-doped graphene; Hydrothermal synthesis; Supercapacitor
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Funding
- Natural Science Foundations of Jiangsu [BK20140531, BK20130490]
- Research Foundation for Talented Scholars of Jiangsu University [14JDG187]
- National Natural Science Foundation of China [21676129]
- Jiangsu Postdoctoral Science Foundation [1501025A]
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Novel and hollow-structured bimetallic oxide (NiCo2O4) anchored on nitrogen-doped graphene (NG) has been manufactured by a hydrothermal-calcination method. The ultrafine hollow-structured NiCo2O4 nanorod can be dexterously grafted on an N-doped graphene surface (NiCo2O4/NG) by regulating the alkali sources. The obtained NiCo2O4/NG composite shows much larger specific capacitance and stability according to the cyclic voltammetry (CV) measurements and galvanostatic charge-discharge (GCD) examinations. The electrochemical measurements show that NiCo2O4/NG-H3 composite exhibited a high specific capacitance of 2147.4 F g(-1) at 1 A g(-1), as well as perfect cycling stability (93.7% capacitance retention after 2000 cycles), indicating a potential application in electrochemical supercapacitors. The XPS spectra of NiCo2O4/NG-H3 further reveal that the excellent performance should be attributed to the electron-donating (synergistic effect) between NiCo2O4 and NG. (C) 2017 Elsevier B. V. All rights reserved.
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