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Article: An oxygen reduction electrocatalyst based on carbon nanotubeĝ€ "graphene complexes

TitleAn oxygen reduction electrocatalyst based on carbon nanotubeĝ€ "graphene complexes
Authors
Issue Date2012
Citation
Nature Nanotechnology, 2012, v. 7, n. 6, p. 394-400 How to Cite?
AbstractOxygen reduction reaction catalysts based on precious metals such as platinum or its alloys are routinely used in fuel cells because of their high activity. Carbon-supported materials containing metals such as iron or cobalt as well as nitrogen impurities have been proposed to increase scalability and reduce costs, but these alternatives usually suffer from low activity and/or gradual deactivation during use. Here, we show that few-walled carbon nanotubes, following outer wall exfoliation via oxidation and high-temperature reaction with ammonia, can act as an oxygen reduction reaction electrocatalyst in both acidic and alkaline solutions. Under a unique oxidation condition, the outer walls of the few-walled carbon nanotubes are partially unzipped, creating nanoscale sheets of graphene attached to the inner tubes. The graphene sheets contain extremely small amounts of irons originated from nanotube growth seeds, and nitrogen impurities, which facilitate the formation of catalytic sites and boost the activity of the catalyst, as revealed by atomic-scale microscopy and electron energy loss spectroscopy. Whereas the graphene sheets formed from the unzipped part of the outer wall of the nanotubes are responsible for the catalytic activity, the inner walls remain intact and retain their electrical conductivity, which facilitates charge transport during electrocatalysis. ©© 2012 Macmillan Publishers Limited.
Persistent Identifierhttp://hdl.handle.net/10722/334282
ISSN
2023 Impact Factor: 38.1
2023 SCImago Journal Rankings: 14.577
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Yanguang-
dc.contributor.authorZhou, Wu-
dc.contributor.authorWang, Hailiang-
dc.contributor.authorXie, Liming-
dc.contributor.authorLiang, Yongye-
dc.contributor.authorWei, Fei-
dc.contributor.authorIdrobo, Juan Carlos-
dc.contributor.authorPennycook, Stephen J.-
dc.contributor.authorDai, Hongjie-
dc.date.accessioned2023-10-20T06:47:01Z-
dc.date.available2023-10-20T06:47:01Z-
dc.date.issued2012-
dc.identifier.citationNature Nanotechnology, 2012, v. 7, n. 6, p. 394-400-
dc.identifier.issn1748-3387-
dc.identifier.urihttp://hdl.handle.net/10722/334282-
dc.description.abstractOxygen reduction reaction catalysts based on precious metals such as platinum or its alloys are routinely used in fuel cells because of their high activity. Carbon-supported materials containing metals such as iron or cobalt as well as nitrogen impurities have been proposed to increase scalability and reduce costs, but these alternatives usually suffer from low activity and/or gradual deactivation during use. Here, we show that few-walled carbon nanotubes, following outer wall exfoliation via oxidation and high-temperature reaction with ammonia, can act as an oxygen reduction reaction electrocatalyst in both acidic and alkaline solutions. Under a unique oxidation condition, the outer walls of the few-walled carbon nanotubes are partially unzipped, creating nanoscale sheets of graphene attached to the inner tubes. The graphene sheets contain extremely small amounts of irons originated from nanotube growth seeds, and nitrogen impurities, which facilitate the formation of catalytic sites and boost the activity of the catalyst, as revealed by atomic-scale microscopy and electron energy loss spectroscopy. Whereas the graphene sheets formed from the unzipped part of the outer wall of the nanotubes are responsible for the catalytic activity, the inner walls remain intact and retain their electrical conductivity, which facilitates charge transport during electrocatalysis. ©© 2012 Macmillan Publishers Limited.-
dc.languageeng-
dc.relation.ispartofNature Nanotechnology-
dc.titleAn oxygen reduction electrocatalyst based on carbon nanotubeĝ€ "graphene complexes-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/nnano.2012.72-
dc.identifier.pmid22635099-
dc.identifier.scopuseid_2-s2.0-84863720819-
dc.identifier.volume7-
dc.identifier.issue6-
dc.identifier.spage394-
dc.identifier.epage400-
dc.identifier.eissn1748-3395-
dc.identifier.isiWOS:000305008200014-

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