In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts

Nanoparticle catalysts comprising two PtSn alloys with different Pt:Sn atomic ratios and a Sn modified Pt catalyst were prepared in order to study the effect of the particle nanostructures on the activity towards the ethanol electrooxidation and the selectivity to CO2. An accurate model of the elect...

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Autores principales:	Calvillo, L., Mendez De Leo, L., Thompson, S.J., Price, S.W.T., Calvo, E.J., Russell, A.E.
Formato:	JOUR
Materias:	Ethanol electrooxidation In situ FTIRS In situ XAFS Pt-Sn nanostructures Structural stability Binary alloys Carbon dioxide Catalyst activity Catalyst selectivity Catalysts Electronic structure Electrooxidation Ethanol Fourier transform infrared spectroscopy Nanostructures Oxidation Platinum Reaction intermediates Stability Thallium alloys Tin Tin alloys Tin compounds X ray absorption spectroscopy Electronic and structural properties Electronic environments Ethanol electro-oxidation In-situ X-ray absorption spectroscopy Nanoparticle catalysts Situ XAFS Sn nanostructures Structural stabilities Platinum alloys
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_15726657_v819_n_p136_Calvillo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_15726657_v819_n_p136_Calvillo
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spelling	todo:paper_15726657_v819_n_p136_Calvillo2023-10-03T16:27:33Z In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts Calvillo, L. Mendez De Leo, L. Thompson, S.J. Price, S.W.T. Calvo, E.J. Russell, A.E. Ethanol electrooxidation In situ FTIRS In situ XAFS Pt-Sn nanostructures Structural stability Binary alloys Carbon dioxide Catalyst activity Catalyst selectivity Catalysts Electronic structure Electrooxidation Ethanol Fourier transform infrared spectroscopy Nanostructures Oxidation Platinum Reaction intermediates Stability Thallium alloys Tin Tin alloys Tin compounds X ray absorption spectroscopy Electronic and structural properties Electronic environments Ethanol electro-oxidation In-situ X-ray absorption spectroscopy Nanoparticle catalysts Situ XAFS Sn nanostructures Structural stabilities Platinum alloys Nanoparticle catalysts comprising two PtSn alloys with different Pt:Sn atomic ratios and a Sn modified Pt catalyst were prepared in order to study the effect of the particle nanostructures on the activity towards the ethanol electrooxidation and the selectivity to CO2. An accurate model of the electronic and structural properties, obtained by ex situ analysis, was established. Alloying of Sn with Pt causes the expansion of the lattice parameter of Pt and modifies its electronic structure. In contrast, the deposition of Sn on the Pt surface has neither effect. The activity of the catalysts towards ethanol oxidation was established voltammetrically and the CO2 selectivity via in situ Fourier transform infrared spectroscopy (FTIRS). Results indicated that the modification of the electronic environment of Pt in Pt-Sn alloys results in a weaker adsorption of the intermediates (acetaldehyde and acetic acid), which desorb easily from the surface of the catalyst resulting in incomplete oxidation to CO2. In contrast, when the electronic structure is not perturbed (Sn modified Pt sample), the amount of CO2 produced increases. The stability of the different nanostructures under working conditions was investigated by in situ X-ray absorption spectroscopy (XAS) measurements, which show that initially both the Sn modified Pt and Pt-Sn alloy nanostructures are stable under applied potential in the potential window studied and in presence of ethanol. Accelerated aging studies showed that the Sn modified Pt nanostructure remained stable, whereas a significant structural change was observed for the Pt-Sn alloys. © 2017 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15726657_v819_n_p136_Calvillo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Ethanol electrooxidation In situ FTIRS In situ XAFS Pt-Sn nanostructures Structural stability Binary alloys Carbon dioxide Catalyst activity Catalyst selectivity Catalysts Electronic structure Electrooxidation Ethanol Fourier transform infrared spectroscopy Nanostructures Oxidation Platinum Reaction intermediates Stability Thallium alloys Tin Tin alloys Tin compounds X ray absorption spectroscopy Electronic and structural properties Electronic environments Ethanol electro-oxidation In-situ X-ray absorption spectroscopy Nanoparticle catalysts Situ XAFS Sn nanostructures Structural stabilities Platinum alloys
spellingShingle	Ethanol electrooxidation In situ FTIRS In situ XAFS Pt-Sn nanostructures Structural stability Binary alloys Carbon dioxide Catalyst activity Catalyst selectivity Catalysts Electronic structure Electrooxidation Ethanol Fourier transform infrared spectroscopy Nanostructures Oxidation Platinum Reaction intermediates Stability Thallium alloys Tin Tin alloys Tin compounds X ray absorption spectroscopy Electronic and structural properties Electronic environments Ethanol electro-oxidation In-situ X-ray absorption spectroscopy Nanoparticle catalysts Situ XAFS Sn nanostructures Structural stabilities Platinum alloys Calvillo, L. Mendez De Leo, L. Thompson, S.J. Price, S.W.T. Calvo, E.J. Russell, A.E. In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
topic_facet	Ethanol electrooxidation In situ FTIRS In situ XAFS Pt-Sn nanostructures Structural stability Binary alloys Carbon dioxide Catalyst activity Catalyst selectivity Catalysts Electronic structure Electrooxidation Ethanol Fourier transform infrared spectroscopy Nanostructures Oxidation Platinum Reaction intermediates Stability Thallium alloys Tin Tin alloys Tin compounds X ray absorption spectroscopy Electronic and structural properties Electronic environments Ethanol electro-oxidation In-situ X-ray absorption spectroscopy Nanoparticle catalysts Situ XAFS Sn nanostructures Structural stabilities Platinum alloys
description	Nanoparticle catalysts comprising two PtSn alloys with different Pt:Sn atomic ratios and a Sn modified Pt catalyst were prepared in order to study the effect of the particle nanostructures on the activity towards the ethanol electrooxidation and the selectivity to CO2. An accurate model of the electronic and structural properties, obtained by ex situ analysis, was established. Alloying of Sn with Pt causes the expansion of the lattice parameter of Pt and modifies its electronic structure. In contrast, the deposition of Sn on the Pt surface has neither effect. The activity of the catalysts towards ethanol oxidation was established voltammetrically and the CO2 selectivity via in situ Fourier transform infrared spectroscopy (FTIRS). Results indicated that the modification of the electronic environment of Pt in Pt-Sn alloys results in a weaker adsorption of the intermediates (acetaldehyde and acetic acid), which desorb easily from the surface of the catalyst resulting in incomplete oxidation to CO2. In contrast, when the electronic structure is not perturbed (Sn modified Pt sample), the amount of CO2 produced increases. The stability of the different nanostructures under working conditions was investigated by in situ X-ray absorption spectroscopy (XAS) measurements, which show that initially both the Sn modified Pt and Pt-Sn alloy nanostructures are stable under applied potential in the potential window studied and in presence of ethanol. Accelerated aging studies showed that the Sn modified Pt nanostructure remained stable, whereas a significant structural change was observed for the Pt-Sn alloys. © 2017 Elsevier B.V.
format	JOUR
author	Calvillo, L. Mendez De Leo, L. Thompson, S.J. Price, S.W.T. Calvo, E.J. Russell, A.E.
author_facet	Calvillo, L. Mendez De Leo, L. Thompson, S.J. Price, S.W.T. Calvo, E.J. Russell, A.E.
author_sort	Calvillo, L.
title	In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
title_short	In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
title_full	In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
title_fullStr	In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
title_full_unstemmed	In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts
title_sort	in situ determination of the nanostructure effects on the activity, stability and selectivity of pt-sn ethanol oxidation catalysts
url	http://hdl.handle.net/20.500.12110/paper_15726657_v819_n_p136_Calvillo
work_keys_str_mv	AT calvillol insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts AT mendezdeleol insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts AT thompsonsj insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts AT priceswt insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts AT calvoej insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts AT russellae insitudeterminationofthenanostructureeffectsontheactivitystabilityandselectivityofptsnethanoloxidationcatalysts
_version_	1807323373200474112

In situ determination of the nanostructure effects on the activity, stability and selectivity of Pt-Sn ethanol oxidation catalysts

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