Laser-induced graphitization of colloidal nanodiamonds for excellent oxygen reduction reaction

Autor:	Minyung Lee, Young Rok Lim, Chan Su Jung, Dong Myung Jang, Hyungsoon Im, Kidong Park, Seung Hyuk Back, Jeunghee Park
Rok vydání:	2014
Předmět:	Materials science Inorganic chemistry Doping General Physics and Astronomy chemistry.chemical_element Nitrogen Solvent chemistry.chemical_compound Colloid chemistry Chemical engineering Acetone Photocatalysis Physical and Theoretical Chemistry Mesoporous material Acetonitrile
Zdroj:	Phys. Chem. Chem. Phys.. 16:2411-2416
ISSN:	1463-9084 1463-9076
DOI:	10.1039/c3cp54039a
Popis:	Graphitized nanodiamonds were conveniently prepared by the laser irradiation of colloidal solution using various solvents. The nanodiamonds were converted into a fully graphitized onion-like structure, which became a cage-like mesoporous structure by the degradation of graphitic layers. Alcohols, acetone, and acetonitrile are more efficient solvents for the graphitization compared to water and hydrocarbons. Therefore the number and morphology of the graphitic layers can be simply controlled by the solvent and laser-irradiation duration. We suggest a graphitization model, in which the photocatalytic oxidation of the solvent accelerates the graphitization of nanodiamonds. The graphitized nanodiamonds were easily doped with the nitrogen and sulfur atoms in a controlled manner. In particular, the spherical graphitic layers were preferentially doped with the pyrrolic nitrogen that enhances remarkably electrocatalytic activity for the oxygen reduction reaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::708c0fb8d1abcef26e571275bfb6735e https://doi.org/10.1039/c3cp54039a Zobrazit plný text záznamu