Electrochemical study of the Pt nanoparticles size effect in the formic acid oxidation

F. Godínez-Salomón, E. Arce-Estrada, M. Hallen-López

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20 Citations (Scopus)

Abstract

Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) provided interesting information about the particle size effect during HCOOH electro-oxidation. They were evaluated Pt nanoparticles between 1.5 and 3.7nm (From Etek Co.). Formic acid reaction shows strong particle size effect, which was correlated with surface condition. CV showed that under certain conditions small particles might have a better catalytic activity than the larger ones. The latter, was supported by EIS which indicate a higher blockage of active sites on larger particle. The co-adsorption of formate and CO on Pt have been postulated as the species which poisoning the catalyst's active sites inhibiting the oxidation of formic acid. The surface blockage was observed as a negative differential resistance (NDR) response. The potential from which NDR appears is higher when the nanoparticles sizes of Pt decrease due to a less effective inhibition process. © 2012 by ESG.
Original languageAmerican English
Pages (from-to)2566-2576
Number of pages2308
JournalInternational Journal of Electrochemical Science
StatePublished - 1 Mar 2012
Externally publishedYes

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formic acid
Formic acid
Electrochemical impedance spectroscopy
Cyclic voltammetry
Particle size
Catalyst poisoning
Nanoparticles
Oxidation
Electrooxidation
Catalyst activity
Carbon Monoxide
Adsorption
Catalysts

Cite this

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title = "Electrochemical study of the Pt nanoparticles size effect in the formic acid oxidation",
abstract = "Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) provided interesting information about the particle size effect during HCOOH electro-oxidation. They were evaluated Pt nanoparticles between 1.5 and 3.7nm (From Etek Co.). Formic acid reaction shows strong particle size effect, which was correlated with surface condition. CV showed that under certain conditions small particles might have a better catalytic activity than the larger ones. The latter, was supported by EIS which indicate a higher blockage of active sites on larger particle. The co-adsorption of formate and CO on Pt have been postulated as the species which poisoning the catalyst's active sites inhibiting the oxidation of formic acid. The surface blockage was observed as a negative differential resistance (NDR) response. The potential from which NDR appears is higher when the nanoparticles sizes of Pt decrease due to a less effective inhibition process. {\circledC} 2012 by ESG.",
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AU - Godínez-Salomón, F.

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AU - Hallen-López, M.

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