Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite

The topography of platinum electrodes produced by electrodeposition (19 to 200 mC cm-2) on highly oriented pyrolytic graphite (HOPG) under different potential modulations was investigated by atomic force microscopy, scanning tunneling microscopy, and H-atom electrosorption voltammetry. To modulate e...

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Autores principales: Rodríguez Nieto, F. J., Pasquale, Miguel Ángel, Cabrera, C. R., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Exactas
Química
Platinum electrodes
Highly oriented pyrolytic graphite
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/122137
https://pubs.acs.org/doi/10.1021/la0611716
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-122137
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Platinum electrodes
Highly oriented pyrolytic graphite
spellingShingle Ciencias Exactas
Química
Platinum electrodes
Highly oriented pyrolytic graphite
Rodríguez Nieto, F. J.
Pasquale, Miguel Ángel
Cabrera, C. R.
Arvia, Alejandro Jorge
Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
topic_facet Ciencias Exactas
Química
Platinum electrodes
Highly oriented pyrolytic graphite
description The topography of platinum electrodes produced by electrodeposition (19 to 200 mC cm-2) on highly oriented pyrolytic graphite (HOPG) under different potential modulations was investigated by atomic force microscopy, scanning tunneling microscopy, and H-atom electrosorption voltammetry. To modulate electrodeposition, (i) triangular potential cycling at 0.1 V s-1, (ii) a linear cathodic potential at 0.1 V s-1 and anodic potential step cycling, and (iii) square wave potential cycling at 5000 Hz were utilized. AFM and STM imaging showed that at lower platinum loading the HOPG surface was partially covered by a 3D sublayer of platinum. Electrodes produced by procedure (i) were made of faceted platinum aggregates of about 200 nm and nanoclusters in the range of 5−20 nm; those that resulted from procedure (ii) consisted of anisotropic aggregates of nanoclusters arranged as quasi-parallel domains. These electrodes from (i) and (ii) behaved as fractal objects. The electrodes resulting from procedure (iii) exhibited a flat surface that behaved as a Euclidean object. For all WEs, as the platinum loading was increased the HOPG surface was fully covered by a thin 3D layer of platinum aggregates produced by electrodeposition and coalescence phenomena. Large platinum loading led to electrodes with fractal geometry. Statistical parameters (root-mean-square height, skewedness, kurtosis, anisotropy, Abbot curve, number of protrusions and valleys, and fractal dimension) were obtained from the analysis of AFM and STM imaging data. Platinum electrodeposition coupled to either H-adatom formation for procedures (i) and (ii) or phonon dispersion for (iii) was involved in the surface atom rearrangements related to electrofaceting. The H-adatom electrosorption voltammetry data were used to evaluate the real electrode surface area via the voltammetric charge and to advance a tentative explanation of the contribution of the different crystallographic facets to the global electrochemical process dominated by weak H−Pt adsorption interactions.
format Articulo
Articulo
author Rodríguez Nieto, F. J.
Pasquale, Miguel Ángel
Cabrera, C. R.
Arvia, Alejandro Jorge
author_facet Rodríguez Nieto, F. J.
Pasquale, Miguel Ángel
Cabrera, C. R.
Arvia, Alejandro Jorge
author_sort Rodríguez Nieto, F. J.
title Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
title_short Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
title_full Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
title_fullStr Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
title_full_unstemmed Morphology of Platinum Electrodeposits in the Three-Dimensional Sublayer to Full Layer Range Produced under Different Potential Modulations on Highly Oriented Pyrolytic Graphite
title_sort morphology of platinum electrodeposits in the three-dimensional sublayer to full layer range produced under different potential modulations on highly oriented pyrolytic graphite
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/122137
https://pubs.acs.org/doi/10.1021/la0611716
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