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dc.contributor.author
Fernandez, Jose Luis  
dc.contributor.author
Zoski, Cynthia  
dc.date.available
2019-11-21T19:53:07Z  
dc.date.issued
2018-01  
dc.identifier.citation
Fernandez, Jose Luis; Zoski, Cynthia; Voltammetric and Scanning Electrochemical Microscopy Investigations of the Hydrogen Evolution Reaction in Acid at Nanostructured Ensembles of Ultramicroelectrode Dimensions: Theory and Experiment; American Chemical Society; Journal of Physical Chemistry C; 122; 1; 1-2018; 71-82  
dc.identifier.issn
1932-7447  
dc.identifier.uri
http://hdl.handle.net/11336/89465  
dc.description.abstract
Mechanistic studies of the hydrogen evolution reaction (HER) on nanoelectrode ensembles of ultramicroelectrode dimensions (UME-NEEs) are demonstrated using addressable nanoelectrode membrane arrays (ANEMAs). A kinetic model considering simultaneous occurrence of all elementary steps and the effects of mass transport to/from the UME-NEE surface was developed and used to interpret HER steady-state voltammograms (SSVs). The analysis accounts for the effect of fraction of covered area, f, and roughness factor, fR, of the nanoelectrodes on HER SSVs and illustrates the roles of these parameters in mechanistic studies of electrocatalyzed multistep reactions on UME-NEEs. The behavior of bare Au UME-NEEs was studied in acid solution, and characterization of the HER on these electrodes was performed by SSV and scanning electrochemical microscopy (SECM) in the substrate generation-tip collection mode (SG-TC). The activity of Au NEEs for the HER was found to be similar to that of macrosized polycrystalline Au. Selective electrodeposition of Pt NPs was performed on Au UME-NEEs, and SSV was used to study the kinetic mechanism of the HER in acid on the Pt-modified UME-NEEs with different f values. UME-NEEs with excess Pt showed HER activity equivalent to polycrystalline Pt, while those with small, almost undetectable, amounts of Pt showed HER behavior that could not be explained as the addition of pure Au and pure Pt contributions. SECM activity screening on Pt-modified ANEMAs detected changes in the apparent electrocatalytic activity for the HER, in agreement with corresponding SSVs.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
American Chemical Society  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
HYDROGEN EVOLUTION REACTION  
dc.subject
NANOELECTRODE ENSEMBLES  
dc.subject
NANOPARTICLES  
dc.subject
ARRAY ELECTRODES  
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica  
dc.subject.classification
Ciencias Químicas  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Voltammetric and Scanning Electrochemical Microscopy Investigations of the Hydrogen Evolution Reaction in Acid at Nanostructured Ensembles of Ultramicroelectrode Dimensions: Theory and Experiment  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-10-10T14:59:46Z  
dc.journal.volume
122  
dc.journal.number
1  
dc.journal.pagination
71-82  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Washington DC  
dc.description.fil
Fil: Fernandez, Jose Luis. Universidad Nacional del Litoral. Instituto de Química Aplicada del Litoral. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Química Aplicada del Litoral.; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina  
dc.description.fil
Fil: Zoski, Cynthia. New Mexico State University; Estados Unidos  
dc.journal.title
Journal of Physical Chemistry C  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/acs.jpcc.7b08976  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/acs.jpcc.7b08976