title: Mobility and Oxidation of Adsorbed CO on Shape-Controlled Pt Nanoparticles in Acidic Medium.
abstract: The knowledge about how CO occupies and detaches from specific surface sites on well-structured Pt surfaces provides outstanding information on both dynamics/mobility of COadsand oxidation of this molecule under electrochemical conditions. This work reports how the potentiostatic growth of different coverage CO adlayers evolves with time on both cubic and octahedral Pt nanoparticles in acidic medium. Data suggest that during the growth of the CO adlayer, COadsmolecules slightly shift toward low coordination sites only on octahedral Pt nanoparticles, so that these undercoordinated sites are the first filled on octahedral Pt nanoparticles. Conversely, on cubic Pt nanoparticles, adsorbed CO behaves as an immobile species, and low coordinated sites as well as (100) terraces are apparently filled uniformly and simultaneously. However, once the adlayer is complete, irrespectively of whether the CO is oxidized in a single step or in a sequence of different potential steps, results suggest that COadsbehaves as an immobile species during its oxidation on both octahedral and cubic Pt nanoparticles.
authors.affiliation: Departamento de Química, Universidade Federal do Maranhão , Avenida dos Portugueses, 1966, CEP 65080-805, São Luís - MA, Brazil.
authors.forename: Manuel J S
authors.identifier: 0000-0001-8531-3388
authors.initials: MJ
authors.lastname: Farias
authors.affiliation: Instituto de Electroquímica, Universidad de Alicante , Ap. 99, E-03080, Alicante, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Busó-Rogero
authors.affiliation: Instituto de Electroquímica, Universidad de Alicante , Ap. 99, E-03080, Alicante, Spain.
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Vidal-Iglesias
authors.affiliation: Instituto de Electroquímica, Universidad de Alicante , Ap. 99, E-03080, Alicante, Spain.
authors.forename: José
authors.initials: J
authors.lastname: Solla-Gullón
authors.affiliation: Instituto de Química, Universidade Federal de Mato Grosso do Sul , C.P. 549, 79070-900, Campo Grande, Brazil.
authors.forename: Giuseppe A
authors.initials: GA
authors.lastname: Camara
authors.affiliation: Instituto de Electroquímica, Universidad de Alicante , Ap. 99, E-03080, Alicante, Spain.
authors.forename: Juan M
authors.initials: JM
authors.lastname: Feliu