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dc.contributor.author
Fernandez, Jose Luis
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dc.contributor.author
Wijesinghe, Manjula
dc.contributor.author
Zoski, Cynthia G.
dc.date.available
2017-06-01T14:51:15Z
dc.date.issued
2015-01
dc.identifier.citation
Fernandez, Jose Luis; Wijesinghe, Manjula; Zoski, Cynthia G.; Theory and experiments for voltammetric and SECM investigations and application to ORR electrocatalysis at nanoelectrode ensembles of ultramicroelectrode dimensions; American Chemical Society; Analytical Chemistry; 87; 2; 1-2015; 1066-1074
dc.identifier.issn
0003-2700
dc.identifier.uri
http://hdl.handle.net/11336/17277
dc.description.abstract
Theoretical and experimental approaches to characterizing nanoelectrode (NE) ensembles of ultramicroelectrode dimensions (UME-NEEs) as a function of fraction of active area and random NE distribution are described. UME-NEEs were fabricated by addressing microregions of a gold-filled polycarbonate membrane through the UMEs of an underlying microfabricated addressable array. Results of Comsol Multiphysics 3D simulations based on randomly spaced NEs of 15 nm radius on a UME disk geometry of radii up to 5 μm are shown for steady-state voltammetry (SSV) and scanning electrochemical microscopy (SECM) experiments. Analytical equations were developed to describe the diffusion-limited steady-state current and steady-state voltammogram at an UME-NEE. These equations are shown to be in good agreement with the simulations and enabled evaluation of experimental SSVs. Comparison of experimental and simulated SECM approach curves, images, and tip voltammograms enabled the fraction of active area and distribution of NEs to be visualized and determined for individual UME-NEEs. Gold UME-NEEs are shown to be unique platforms for electrodeposition in forming nanoparticle electrodes (UME-NPEs). Electrocatalysis results for the oxygen reduction reaction (ORR) on Pt UME-NPEs in 0.1 M H2SO4 are also shown.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Microelectrodes
dc.subject
Ensembles
dc.subject
Secm
dc.subject
Nanoparticles
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Theory and experiments for voltammetric and SECM investigations and application to ORR electrocatalysis at nanoelectrode ensembles of ultramicroelectrode dimensions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-04T18:43:20Z
dc.journal.volume
87
dc.journal.number
2
dc.journal.pagination
1066-1074
dc.journal.pais
Estados Unidos
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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 Conicet - Santa Fe; Argentina. University Of New Mexico; Estados Unidos
dc.description.fil
Fil: Wijesinghe, Manjula. University Of New Mexico; Estados Unidos
dc.description.fil
Fil: Zoski, Cynthia G.. University Of New Mexico; Estados Unidos
dc.journal.title
Analytical Chemistry
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/ac5039187
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/abs/10.1021/ac5039187
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