Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway

The early stages of Pt electrodeposition (0.675-0.620 V vs RHE) on highly oriented pyrolytic graphite (HOPG) from chloroplatinic acid at 25 °C have been studied by ex-situ STM and SEM imaging complemented with electrochemical data. Nucleation and 3D growth of Pt initiate at HOPG surface defects. Lar...

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Detalles Bibliográficos
Autores principales:	Zubimendi, J. L., Vázquez, L., Ocon, P., Vara, J. M., Triaca, Walter Enrique, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1993
Materias:	Ciencias Exactas Química scanning tunneling microscopy Platino (Metal) pyrolitic graphite electrodeposition scanning electron microscopy Electroquímica
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/80551
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-80551
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 scanning tunneling microscopy Platino (Metal) pyrolitic graphite electrodeposition scanning electron microscopy Electroquímica
spellingShingle	Ciencias Exactas Química scanning tunneling microscopy Platino (Metal) pyrolitic graphite electrodeposition scanning electron microscopy Electroquímica Zubimendi, J. L. Vázquez, L. Ocon, P. Vara, J. M. Triaca, Walter Enrique Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
topic_facet	Ciencias Exactas Química scanning tunneling microscopy Platino (Metal) pyrolitic graphite electrodeposition scanning electron microscopy Electroquímica
description	The early stages of Pt electrodeposition (0.675-0.620 V vs RHE) on highly oriented pyrolytic graphite (HOPG) from chloroplatinic acid at 25 °C have been studied by ex-situ STM and SEM imaging complemented with electrochemical data. Nucleation and 3D growth of Pt initiate at HOPG surface defects. Large Pt agglomerates containing flat crystallites with well-defined geometries are found around HOPG steps. Pt crystallites formed by 1-2 nm size clusters become more compact as the electrodeposition potential is shifted negatively or the Pt electrodeposited charge is increased. High-resolution STM imaging reveals large uncovered HOPG areas with the nearest-neighbor C-C distance d = 0.24 ± 0.02 nm and fiat hexagonal Pt crystallites. Electrochemical data combined with STM imaging can be interpreted in terms of a diffusion-controlled Pt(IV) to Pt(II) reaction at HOPG and a surface reaction leading to Pt(0) at HOPG defects.
format	Articulo Articulo
author	Zubimendi, J. L. Vázquez, L. Ocon, P. Vara, J. M. Triaca, Walter Enrique Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_facet	Zubimendi, J. L. Vázquez, L. Ocon, P. Vara, J. M. Triaca, Walter Enrique Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_sort	Zubimendi, J. L.
title	Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
title_short	Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
title_full	Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
title_fullStr	Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
title_full_unstemmed	Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
title_sort	early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway
publishDate	1993
url	http://sedici.unlp.edu.ar/handle/10915/80551
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Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway

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