Mobility and Oxidation of Adsorbed CO on Shape-Controlled Pt Nanoparticles in Acidic Medium

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Title: Mobility and Oxidation of Adsorbed CO on Shape-Controlled Pt Nanoparticles in Acidic Medium
Authors: Farias, Manuel J.S. | Busó-Rogero, Carlos | Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Camara, Giuseppe A. | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Shape-controlled Pt nanoparticles | CO oxidation | Surface chemical reaction | Surface diffusion
Knowledge Area: Química Física
Issue Date: 11-Jan-2017
Publisher: American Chemical Society
Citation: Langmuir. 2017, 33(4): 865-871. doi:10.1021/acs.langmuir.6b03612
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 COads and 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, COads molecules 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 COads behaves as an immobile species during its oxidation on both octahedral and cubic Pt nanoparticles.
Sponsor: M. J. S. Farias is grateful to the CAPES/PNPD (Brazil) for the financial support. G. A. Camara acknowledges CNPq (grants no. 405695/2013-6 and 309176/2015-8) and FUNDECT (grants no. 23/200.583/2012). J. M. Feliu thanks the MINECO (Spain) project CTQ2016-76221-P. J.S.G. acknowledges financial support from VITC (Vicerrectorado de Investigación y Transferencia de Conocimiento) of the University of Alicante.
ISSN: 0743-7463 (Print) | 1520-5827 (Online)
DOI: 10.1021/acs.langmuir.6b03612
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 American Chemical Society
Peer Review: si
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