Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

Maria Escudero Escribano; Arnau Verdaguer-Casadevall; Arnau Verdaguer Casadevall; Paolo Malacrida; Ulrik Grønbjerg Vej-Hansen; Brian P. Knudsen; Anders K. Jepsen; Jan Rossmeisl; Ifan E. L. Stephens; Ib Chorkendorff

doi:10.1021/ja306348d

Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

Maria Escudero Escribano, Arnau Verdaguer-Casadevall, Arnau Verdaguer Casadevall, Paolo Malacrida, Ulrik Grønbjerg Vej-Hansen, Brian P. Knudsen, Anders K. Jepsen, Jan Rossmeisl, Ifan E. L. Stephens, Ib Chorkendorff

Technical University of Denmark

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The activity and stability of Pt₅Gd for the oxygen reduction reaction (ORR) have been studied, using a combination of electrochemical measurements, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and density functional theory calculations. Sputter-cleaned, polycrystalline Pt₅Gd shows a 5-fold increase in ORR activity, relative to pure Pt at 0.9 V, approaching the most active in the literature for catalysts prepared in this way. AR-XPS profiles after electrochemical measurements in 0.1 M HClO4 show the formation of a thick Pt overlayer on the bulk Pt₅Gd, and the enhanced ORR activity can be explained by means of compressive strain effects. Furthermore, these novel bimetallic electrocatalysts are highly stable, which, in combination with their enhanced activity, makes them very promising for the development of new cathode catalysts for fuel cells.

Original language	English
Journal	Journal of the American Chemical Society
Volume	134
Issue number	40
Pages (from-to)	16476-16479
ISSN	0002-7863
DOIs	https://doi.org/10.1021/ja306348d
Publication status	Published - 2012

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title = "Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction",

abstract = "The activity and stability of Pt5Gd for the oxygen reduction reaction (ORR) have been studied, using a combination of electrochemical measurements, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and density functional theory calculations. Sputter-cleaned, polycrystalline Pt5Gd shows a 5-fold increase in ORR activity, relative to pure Pt at 0.9 V, approaching the most active in the literature for catalysts prepared in this way. AR-XPS profiles after electrochemical measurements in 0.1 M HClO4 show the formation of a thick Pt overlayer on the bulk Pt5Gd, and the enhanced ORR activity can be explained by means of compressive strain effects. Furthermore, these novel bimetallic electrocatalysts are highly stable, which, in combination with their enhanced activity, makes them very promising for the development of new cathode catalysts for fuel cells.",

author = "Escribano, {Maria Escudero} and Arnau Verdaguer-Casadevall and {Verdaguer Casadevall}, Arnau and Paolo Malacrida and Vej-Hansen, {Ulrik Gr{\o}nbjerg} and Knudsen, {Brian P.} and Jepsen, {Anders K.} and Jan Rossmeisl and Stephens, {Ifan E. L.} and Ib Chorkendorff",

year = "2012",

doi = "10.1021/ja306348d",

language = "English",

volume = "134",

pages = "16476--16479",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "ACS Publications",

number = "40",

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TY - JOUR

T1 - Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

AU - Escribano, Maria Escudero

AU - Verdaguer-Casadevall, Arnau

AU - Verdaguer Casadevall, Arnau

AU - Malacrida, Paolo

AU - Vej-Hansen, Ulrik Grønbjerg

AU - Knudsen, Brian P.

AU - Jepsen, Anders K.

AU - Rossmeisl, Jan

AU - Stephens, Ifan E. L.

AU - Chorkendorff, Ib

PY - 2012

Y1 - 2012

N2 - The activity and stability of Pt5Gd for the oxygen reduction reaction (ORR) have been studied, using a combination of electrochemical measurements, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and density functional theory calculations. Sputter-cleaned, polycrystalline Pt5Gd shows a 5-fold increase in ORR activity, relative to pure Pt at 0.9 V, approaching the most active in the literature for catalysts prepared in this way. AR-XPS profiles after electrochemical measurements in 0.1 M HClO4 show the formation of a thick Pt overlayer on the bulk Pt5Gd, and the enhanced ORR activity can be explained by means of compressive strain effects. Furthermore, these novel bimetallic electrocatalysts are highly stable, which, in combination with their enhanced activity, makes them very promising for the development of new cathode catalysts for fuel cells.

AB - The activity and stability of Pt5Gd for the oxygen reduction reaction (ORR) have been studied, using a combination of electrochemical measurements, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and density functional theory calculations. Sputter-cleaned, polycrystalline Pt5Gd shows a 5-fold increase in ORR activity, relative to pure Pt at 0.9 V, approaching the most active in the literature for catalysts prepared in this way. AR-XPS profiles after electrochemical measurements in 0.1 M HClO4 show the formation of a thick Pt overlayer on the bulk Pt5Gd, and the enhanced ORR activity can be explained by means of compressive strain effects. Furthermore, these novel bimetallic electrocatalysts are highly stable, which, in combination with their enhanced activity, makes them very promising for the development of new cathode catalysts for fuel cells.

U2 - 10.1021/ja306348d

DO - 10.1021/ja306348d

M3 - Journal article

C2 - 22998588

SN - 0002-7863

VL - 134

SP - 16476

EP - 16479

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 40

ER -

Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

Abstract

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