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dc.contributor.author
Barrera Diaz, Deicy Amparo
dc.contributor.author
Florent, Marc
dc.contributor.author
Kulko, Margarita
dc.contributor.author
Bandosz, Teresa J.
dc.date.available
2020-10-27T18:59:59Z
dc.date.issued
2019-11
dc.identifier.citation
Barrera Diaz, Deicy Amparo; Florent, Marc; Kulko, Margarita; Bandosz, Teresa J.; Ultramicropore-influenced mechanism of oxygen electroreduction on metal-free carbon catalysts; Royal Society of Chemistry; Journal of Materials Chemistry A; 7; 47; 11-2019; 27110-27123
dc.identifier.issn
2050-7488
dc.identifier.uri
http://hdl.handle.net/11336/116965
dc.description.abstract
Two series of microporous carbon catalysts were prepared from ordered mesoporous carbon obtained from sucrose and KIT-6 as a carbon source and template, respectively. To modify surface features, the mother sample carbon was oxidized and then exposed to ammonia at 600, 800 and 950 °C. The latter treatment resulted in an introduction of nitrogen species to the carbons' matrices. The N-modified carbons had almost identical porosities and differed mainly in the content of nitrogen and oxygen on the surface. Moreover, the environment of the nitrogen groups on the surface did not show marked variations. To further modified N-free samples, the oxidized carbons was reduced by heating at 950 °C. Mother carbon, its oxidized and reduced counterparts made a series of N-free samples which differed markedly not only in the porosity but also in the content of oxygen groups. Prepared carbons were tested as ORR electrocatalysts in an alkaline electrolyte. The results indicated N-free carbons as the most efficient ORR catalysts from the views point of the number of electron transfer and kinetic current density (3.98 and 60 mA cm-2, respectively) The superior performance was linked to the high volume of small pores similar in size to the O2 molecule. This pore effect is complex since a strong adsorption of oxygen promoting the reduction process in ultramicropores and the access of electrolyte with dissolved oxygen to these pores are important. Therefore, to account for new factor addressing the effects of these features was proposed. It is referred to as a Pore Influence Factor, PIF, and it combines the number of dissociating groups (affecting hydrophilicity), ECSA and volume of ultramicropores (affecting O2 adsorption). It was established that the number of electrons transfer strongly depends on this factor. A direct dependence of the current density on the volume of micro and ultramicropores was also found for the N-free series of carbons.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Royal Society of Chemistry
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
N-DOPED CARBONS
dc.subject
OXYGEN REDUCTION REACTION
dc.subject
SURFACE CHEMISTRY MODIFICATION
dc.subject.classification
Ingeniería de los Materiales
dc.subject.classification
Ingeniería de los Materiales
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
dc.title
Ultramicropore-influenced mechanism of oxygen electroreduction on metal-free carbon catalysts
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-07-22T15:40:54Z
dc.identifier.eissn
2050-7496
dc.journal.volume
7
dc.journal.number
47
dc.journal.pagination
27110-27123
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Barrera Diaz, Deicy Amparo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich". Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Instituto de Física Aplicada "Dr. Jorge Andrés Zgrablich"; Argentina. The City College of New York; Estados Unidos
dc.description.fil
Fil: Florent, Marc. The City College of New York; Estados Unidos
dc.description.fil
Fil: Kulko, Margarita. The City College of New York; Estados Unidos
dc.description.fil
Fil: Bandosz, Teresa J.. The City College of New York; Estados Unidos
dc.journal.title
Journal of Materials Chemistry A
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://xlink.rsc.org/?DOI=C9TA10850E
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1039/C9TA10850E
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