Journal
RSC ADVANCES
Volume 3, Issue 48, Pages 25891-25901Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra44249g
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Funding
- NCN, Poland [2011/01/B/ST5/06051]
- Robert A. Welch Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1110967, 1124075] Funding Source: National Science Foundation
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Small carbon nano-onions (CNOs) are spherical, ca. 5 nm in diameter, concentric shells of graphitic carbon that can be also described as multi-shelled fullerenes. Given the easy functionalization and high thermal stability of the CNOs produced from nanodiamond, they are the most obvious choice for studying the potential applications of these multi-shelled fullerenes in electrochemical supercapacitors (ES). Since limited accessibility of the carbon surface to electrolyte penetration is observed for carbon nano-onions, performance enhancement was accomplished by modifying the CNO surfaces with pseudocapacitive redox materials: Ni(OH)(2) and NiO. These composites were characterized by TEM, SEM, XRD, TGA-DTG-DTA and Raman spectroscopy. The electrochemical properties of these composites were also investigated. Compared with pristine CNOs (30.6 F g(-1) at 5 mV s(-1)), modified CNOs (1225.2 F g(-1) for CNOs/Ni(OH)(2) and 290.6 F g(-1) for CNOs/NiO, both at 5 mV s(-1)) show improved electrochemical performance, promising for the development of supercapacitors.
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