Bromide Adsorption on Pt(111) over a Wide Range of pH: Cyclic Voltammetry and CO Displacement Experiments

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Title: Bromide Adsorption on Pt(111) over a Wide Range of pH: Cyclic Voltammetry and CO Displacement Experiments
Authors: Mello, Gisele A.B. | Briega-Martos, Valentín | Climent, Victor | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Bromide adsorption | Pt(111) | pH | Cyclic voltammetry | CO displacement
Knowledge Area: Química Física
Issue Date: 23-Jul-2018
Publisher: American Chemical Society
Citation: The Journal of Physical Chemistry C. 2018, 122(32): 18562-18569. doi:10.1021/acs.jpcc.8b05685
Abstract: Bromide adsorption on Pt(111) is investigated by means of cyclic voltammetry and CO displacement experiments at different pH values. In acidic pH, bromide adsorption is strongly overlapped with hydrogen desorption process. However, as the pH increases, hydrogen adsorption process displaces toward negative potentials while bromide adsorption remains nearly in the same potential region. In consequence, both processes decouple at higher pH values. The structural transition from Pt(111)-(1×1) to Pt(111)(3×3)-4Br is pH independent, in the SHE scale, and not observed for pH > 9.1. Values of pztc are extracted from the combination of voltammetric and CO displaced charges. An alternative approach to obtain charge curves is based on the coincidence of the curves at the structural transition characteristic of the bromide adlayer completion. Pztc values obtained from different approaches with and without bromide are compared, and their dependence on pH discussed. A thermodynamic analysis is carried out to obtain hydrogen Gibbs excess and charge number from the Esin Markov analysis.
Sponsor: This work has been financially supported by the MCINN-FEDER (Spain) through Project CTQ2016-76221-P. V.B.-M. thankfully acknowledges to MINECO the award of a predoctoral grant (BES-2014-068176, Project CTQ2013-44803-P). G.A.B.M. expresses thanks for the postdoctorate fellowship from CNPq (Grant No. PDE 233268/2014-6).
URI: http://hdl.handle.net/10045/79218
ISSN: 1932-7447 (Print) | 1932-7455 (Online)
DOI: 10.1021/acs.jpcc.8b05685
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 American Chemical Society
Peer Review: si
Publisher version: https://doi.org/10.1021/acs.jpcc.8b05685
Appears in Collections:INV - EQSUP - Artículos de Revistas

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