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dc.contributor.author
Zoski, Cynthia G.
dc.contributor.author
Fernandez, Jose Luis
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Imaduwage, Kasun
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Gunasekara, Dulan
dc.contributor.author
Vadari, Raghuveer
dc.date.available
2017-04-07T15:48:45Z
dc.date.issued
2011-01
dc.identifier.citation
Zoski, Cynthia G.; Fernandez, Jose Luis; Imaduwage, Kasun; Gunasekara, Dulan; Vadari, Raghuveer; Evaluation of the intrinsic kinetic activity of nanoparticle ensembles under steady-state conditions; Elsevier; Journal Of Electroanalytical Chemistry; 651; 1; 1-2011; 80-93
dc.identifier.issn
1572-6657
dc.identifier.uri
http://hdl.handle.net/11336/14977
dc.description.abstract
We report theory and strategies for evaluating the intrinsic kinetic activity for oxygen reduction at Pt nanoparticle (NP) ensembles on a large glassy carbon electrode (GCE) under steady-state conditions. Pt NPs were synthesized using reverse microemulsions which facilitated the deposition of random ensembles of bare NPs with controlled NP mean size and coverage. Steady-state voltammograms (SSVs) for oxygen reduction were recorded for various NP ensembles with different NP size and coverage. The effects of NP coverage and mass-transport rate on SSV features were analyzed. For SSVs normalized with respect to their limiting current, more negative potentials are needed to reach the limiting current region and the i–E slope decreases as NP coverage decreases. For those normalized SSVs having unequal limiting currents, the kinetic rate relative to the mass-transport rate changes and plays a role in the decreasing steepness of the SSV. In contrast, normalized SSVs recorded under the same mass transport conditions and decreasing NP coverage are displaced negatively along the potential axis without a change in the i–E slope. Normalized SSVs recorded using the same mass transport conditions on electrodes with similar fractions of inactive area but different NP sizes were found to be similar. Tafel plots were constructed by processing the SSVs either directly through the use of the electroactive surface area AES or indirectly through a two-step procedure that uses the geometric surface area where an apparent potential-dependent kinetic current density j app K (E) is first calculated. These two approaches are equivalent and the resulting kinetic current density jK(E) dependencies were shown to be equivalent. The direct method is applicable when AES can be determined whereas the indirect approach is useful when the measurement of AEAS is not possible, but information relating to the fraction of active or inactive area is available.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Pt Nanoparticles
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Intrinsic Kinetic Activity
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Nanoparticle Ensembles
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Reverse Microemulsions
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Steady-State Voltammograms
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Evaluation of the intrinsic kinetic activity of nanoparticle ensembles under steady-state conditions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-22T15:20:16Z
dc.journal.volume
651
dc.journal.number
1
dc.journal.pagination
80-93
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Zoski, Cynthia G.. New Mexico State University. Department of Chemistry and Biochemistry; Estados Unidos
dc.description.fil
Fil: Fernandez, Jose Luis. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe; Argentina. New Mexico State University. Department of Chemistry and Biochemistry; Estados Unidos
dc.description.fil
Fil: Imaduwage, Kasun. New Mexico State University. Department of Chemistry and Biochemistry; Estados Unidos
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Fil: Gunasekara, Dulan. New Mexico State University. Department of Chemistry and Biochemistry; Estados Unidos
dc.description.fil
Fil: Vadari, Raghuveer. New Mexico State University. Department of Chemistry and Biochemistry; Estados Unidos
dc.journal.title
Journal Of Electroanalytical Chemistry
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jelechem.2010.10.023
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1572665710004303
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