Enhanced catalytic activity and stability for the electrooxidation of formic acid on lead modified shape controlled platinum nanoparticles

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Title: Enhanced catalytic activity and stability for the electrooxidation of formic acid on lead modified shape controlled platinum nanoparticles
Authors: Perales-Rondón, Juan V. | Solla-Gullón, José | Herrero, Enrique | Sánchez-Sánchez, Carlos 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 | Pb adsorption | Pb modified electrodes | Formic acid oxidation | SECM
Knowledge Area: Química Física
Issue Date: Feb-2017
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2017, 201: 48-57. doi:10.1016/j.apcatb.2016.08.011
Abstract: High catalytic activity for formic acid oxidation reaction (FAOR) is demonstrated in Pb modified shape-controlled Pt nanoparticles (NPs). Cyclic voltammetry is used to follow the effective modification of Pt NPs by Pb. Octahedral shaped Pt NPs (having a (111) preferential surface structure) modified by Pb are proved the most active electrocatalyst studied towards FAOR and display a catalytic activity of c.a. 7 mA cm−2 at 0.5 V in 0.1 M formic acid solution. This current density represents an enhancement factor of 29.5 with respect to the unmodified Pt NPs and this is 2.7 and 2.3 times higher than that found on Tlθ/100-Pt NPs and Sbθ/111-Pt NPs, respectively, some of the most active electrocatalysts based on adatoms modified Pt NPs reported so far. This outstanding activity is displayed at maximum Pb coverage and also confers a wide electrocatalyst stability over the entire potential range studied. FAOR is also studied using scanning electrochemical microscopy (SECM) by the micropipette delivery/substrate collection (MD/SC) working mode as a preliminary rapid test to identify active electrocatalysts. In particular, the remarkable activity enhancement exhibited by a Pt ultramicroelectrode (100 μm diameter) modified by Pb is rapidly imaged by SECM providing preliminary catalyst performance information. Thus, this technique emerges as a suitable and fast method to test, and in some cases quantify, catalyst activity for reactions of interest in fuel cell applications.
Sponsor: This work has been financially supported by the MICINN (Spain)(projects CTQ2013-44083-P and CTQ2013-48280-C3-3-R), Generalitat Valenciana (project PROMETEOII/2014/013, FEDER) and CNRS (project Défi Instrumentation aux limites 2015).
URI: http://hdl.handle.net/10045/62327
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2016.08.011
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2016.08.011
Appears in Collections:INV - EQSUP - Artículos de Revistas
INV - LEQA - Artículos de Revistas

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