Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction

Abstract Nitrogen-doped nano-onions (NNO) were prepared as electrocatalytic materials for the oxygen reduction reaction (ORR). The nano-onions (NO), spherical graphitic material particles, were prepared by pyrolysis of nanodiamonds (ND). Oxidized NO (ONO) was prepared from NO by a modified Hummers’...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	E. Y. Choi, C. K. Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b8365e0fb4634f8ab9010e019dd1f1ce
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:b8365e0fb4634f8ab9010e019dd1f1ce
record_format	dspace
spelling	oai:doaj.org-article:b8365e0fb4634f8ab9010e019dd1f1ce2021-12-02T12:32:28ZFabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction10.1038/s41598-017-04597-62045-2322https://doaj.org/article/b8365e0fb4634f8ab9010e019dd1f1ce2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04597-6https://doaj.org/toc/2045-2322Abstract Nitrogen-doped nano-onions (NNO) were prepared as electrocatalytic materials for the oxygen reduction reaction (ORR). The nano-onions (NO), spherical graphitic material particles, were prepared by pyrolysis of nanodiamonds (ND). Oxidized NO (ONO) was prepared from NO by a modified Hummers’ method, and this was mixed with urea, followed by pyrolysis, resulting in the formation of NNO. The nitrogen content and molar ratio of nitrogen-containing groups in the NNOs were varied by controlling the oxygen content of ONO to explore the effect of nitrogen content on the ORR activity. The formation of NO was confirmed by Raman spectroscopy, X-ray diffraction analysis, and high-resolution transmission electron microscopy. X-ray photoelectron spectroscopy analyses were conducted to confirm the formation of the NNO and the structures of the nitrogen-containing groups in the NNOs. The ORR activities of the NNOs were investigated using a rotating disk electrode. The NNOs showed a higher onset potential than that of NO, and the ORR activity of the NNO could be improved by increasing the number of active sites (nitrogen-containing groups) in the NNO. In addition, the NNO exhibited better long-term stability and resistance toward methanol crossover in the ORR than the platinum-based catalysts.E. Y. ChoiC. K. KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q E. Y. Choi C. K. Kim Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
description	Abstract Nitrogen-doped nano-onions (NNO) were prepared as electrocatalytic materials for the oxygen reduction reaction (ORR). The nano-onions (NO), spherical graphitic material particles, were prepared by pyrolysis of nanodiamonds (ND). Oxidized NO (ONO) was prepared from NO by a modified Hummers’ method, and this was mixed with urea, followed by pyrolysis, resulting in the formation of NNO. The nitrogen content and molar ratio of nitrogen-containing groups in the NNOs were varied by controlling the oxygen content of ONO to explore the effect of nitrogen content on the ORR activity. The formation of NO was confirmed by Raman spectroscopy, X-ray diffraction analysis, and high-resolution transmission electron microscopy. X-ray photoelectron spectroscopy analyses were conducted to confirm the formation of the NNO and the structures of the nitrogen-containing groups in the NNOs. The ORR activities of the NNOs were investigated using a rotating disk electrode. The NNOs showed a higher onset potential than that of NO, and the ORR activity of the NNO could be improved by increasing the number of active sites (nitrogen-containing groups) in the NNO. In addition, the NNO exhibited better long-term stability and resistance toward methanol crossover in the ORR than the platinum-based catalysts.
format	article
author	E. Y. Choi C. K. Kim
author_facet	E. Y. Choi C. K. Kim
author_sort	E. Y. Choi
title	Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
title_short	Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
title_full	Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
title_fullStr	Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
title_full_unstemmed	Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
title_sort	fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b8365e0fb4634f8ab9010e019dd1f1ce
work_keys_str_mv	AT eychoi fabricationofnitrogendopednanoonionsandtheirelectrocatalyticactivitytowardtheoxygenreductionreaction AT ckkim fabricationofnitrogendopednanoonionsandtheirelectrocatalyticactivitytowardtheoxygenreductionreaction
_version_	1718394057666854912

Fabrication of nitrogen-doped nano-onions and their electrocatalytic activity toward the oxygen reduction reaction

Ejemplares similares