Journal
NANOTECHNOLOGY
Volume 28, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/aa53f3
Keywords
carbon nanotubes; non-covalent functionalization; electroless deposition; supercapacitor; nickel oxide nanotubes
Funding
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2014-04066]
- Discovery Grant (NSERC-DG)
- Canada Foundation for Innovation [33016]
- John R Evans Leaders Fund (CFI-JELF)
- Ontario Research Fund Research Infrastructure (ORF-RI) grants
- Egyptian Armaments Authority
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A novel approach for the fabrication of nickel oxide nanotubes based on multiwalled carbon nanotubes as a sacrificial template is described. Electroless deposition is employed to deposit nickel onto carbon nanotubes. The subsequent annealing of the product in the presence of air oxidizes nickel to nickel oxide, and carbon is released as gaseous carbon dioxide, leaving behind nickel oxide nanotubes. Electron microscopy and elemental mapping confirm the formation of nickel oxide nanotubes. New chelating polyelectrolytes are used as dispersing agents to achieve high colloidal stability for both the nickel-coated carbon nanotubes and the nickel oxide nanotubes. A gravimetric specific capacitance of 245.3 F g(-1) and. an areal capacitance of 3.28 F cm(-2) at a scan rate of 2 mV s(-1) is achieved, with an electrode fabricated using nickel oxide nanotubes as the active element with a mass loading of 24.1 mg cm(-2).
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