Boron‐Doped Polygonal Carbon Nano‐Onions: Synthesis and Applications in Electrochemical Energy Storage. Issue 29 (26th April 2017)

• Record Type: Journal Article
• Authors: Mykhailiv, Olena; Brzezinski, Krzysztof; Sulikowski, Bogdan; Olejniczak, Zbigniew; Gras, Malgorzata; Lota, Grzegorz; Molina‐Ontoria, Agustin; Jakubczyk, Michal; Echegoyen, Luis; Plonska‐Brzezinska, Marta E.
• Is Part Of: Chemistry. Volume 23:Issue 29(2017)
• Page Start: 7132
• Page End: 7141
• Publication Date: 2017-04-26
• Subjects: boron -- carbon nano-onion -- doping -- electrochemistry -- supercapacitors; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201700914
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Doping of carbon nanostructures with heteroatoms, such as boron or nitrogen, is one of the most effective ways to change their properties to make them suitable for various applications. Carbon nano‐onions (CNOs) doped with boron (B‐CNOs) were prepared by annealing (1650 °C) nanodiamond particles (NDs) under an inert He atmosphere in the presence of B. Their physicochemical properties were measured using transmission (TEM) and scanning (SEM) electron microscopy, X‐ray photoelectron spectroscopy (XPS), 10 B and 11 B solid‐state magic‐angle spinning (MAS) NMR spectroscopy, X‐ray powder diffraction (XRD), Raman spectroscopy, porosimetry, and differential‐thermogravimetric analyses (TGA‐DTG). These properties were systematically discussed for the undoped and B‐doped CNO samples. The amount of substitutional B in the CNO samples varied from 0.76 to 3.21 at. %. The TEM, XRD, and Raman analyses revealed that the increased amount of B doping resulted in decreased interlayer spacing and polygonization of the structures, which in turn led to their unusual physicochemical properties. All synthesized materials were tested as electrodes for electrochemical capacitors. The B‐CNOs with low concentration of doping agent exhibited higher reversible capacitances, mainly owing to the formation of hydrophilic polygonal nanostructures and higher porosity. Abstract : Doped onions : Carbon nano‐onions (CNOs) doped with boron (B‐CNOs) are prepared by annealing (1650 °C) nanodiamond particles under an inert He atmosphere in the presence of B. The results indicate that polygonal boron‐doped CNOs are formed without disruption of their graphitic layers. Owing to good power characteristics and excellent long‐term charge–discharge stability, these boron‐doped materials are very promising for the development of new electronic devices.