Formic acid oxidation on different coverages of Bismuth-modified Pt(1 0 0): A detailed voltammetric and FTIR study

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Title: Formic acid oxidation on different coverages of Bismuth-modified Pt(1 0 0): A detailed voltammetric and FTIR study
Authors: Wei, Zhen | Jordà-Faus, Pepe | Chico-Mesa, Lorena | Cai, Jun | Chen, Yan-Xia | Rodes, Antonio | Feliu, Juan M. | Herrero, Enrique
Research Group/s: Electroquímica de Superficies | Grupo de Espectroelectroquímica y Modelización (GEM)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Pt(100) | Bismuth adatoms | Formic acid oxidation | Concentration effect | FTIR
Issue Date: 5-Jul-2023
Publisher: Elsevier
Citation: Journal of Catalysis. 2023, 426: 61-70. https://doi.org/10.1016/j.jcat.2023.06.038
Abstract: The formic acid oxidation reaction (FAOR) on bismuth-modified Pt(100) is studied using electrochemical techniques and FITR spectroscopy at different bismuth coverages and formic acid concentrations. The results clearly show that: (1) The measured currents for the Bi-modified Pt(100) surface contain contributions from both the Pt-Bi ensembles and the Pt sites far from the Bi adatoms. (2) The catalytic effect of bismuth is not linked to the adsorption of formate on Pt sites. (3) The bismuth not only improves the activity of the FAOR through the active intermediate but also inhibits the CO poison by a third-body effect. (4) The experimental results indicate that the catalytic activity is linked to the Pt-Bi ensembles. The active species, formate, adsorbs on the Bi site and the neighboring Pt sites facilitate the cleavage of the C-H bond. (5) From the concentration dependence, the reaction order for formate on bismuth-modified Pt(100) is 1 at low potentials. In contrast, a reaction order of 0.5 is obtained at higher potentials. These results are in agreement with the proposed mechanism.
Sponsor: This work has been financially supported by the National Natural Science Foundation of China (no. 22172151, 21972131), Ministerio de Ciencia e Innovación (Project PID2019-105653GB-I00), and Generalitat Valenciana (Project PROMETEO/2020/063). Zhen Wei acknowledges support from the China Scholarship Council (award number 202106340060).
URI: http://hdl.handle.net/10045/135717
ISSN: 0021-9517 (Print) | 1090-2694 (Online)
DOI: 10.1016/j.jcat.2023.06.038
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Peer Review: si
Publisher version: https://doi.org/10.1016/j.jcat.2023.06.038
Appears in Collections:INV - EQSUP - Artículos de Revistas
INV - GEM - Artículos de Revistas

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