Journal
ELECTROCHIMICA ACTA
Volume 151, Issue -, Pages 99-108Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.10.156
Keywords
NiCo2O4 nanoneedles; 3D graphene-nickel foam supercapacitor; methanol electro-oxidation
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Funding
- National Natural Science Foundation of China [21371019]
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Mesoporous NiCo2O4 nanoneedles were directly grown on three dimensional (3D) graphene-nickel foam which was prepared by chemical vapor deposition, labeled as NCO/GNF. The structure and morphology of NCO/GNF were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, element mapping and Raman spectroscopy. The NCO/GNF was employed as electrodes for supercapacitor and methanol electro-oxidation. When used for supercapacitor, the NiCo2O4 nanoneedles exhibit hi exhibit high specific capacitance (1588 F g(-1) at 1 A g(-1)), high power density and energy density (33.88 Wh kg(-1) at 5 kW kg(-1)) as well as long cycling stability. In methanol electro-oxidation, the NiCo2O4 nanoneedles deliver high electro-oxidation activity (93.3 A g(-1) at 0.65 V) and electro-oxidation stability. The good electrochemical performance of NiCo2O4 nanoneedles is attributed to the 3D structure with large specific area, high conductivity and fast ions/electrons transport. (C) 2014 Elsevier Ltd. All rights reserved.
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