TY - JOUR

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

A1 - Escribano,Maria Escudero

A1 - Verdaguer-Casadevall,Arnau

A1 - Verdaguer Casadevall,Arnau

A1 - Malacrida,Paolo

A1 - Vej-Hansen,Ulrik Grønbjerg

A1 - Knudsen,Brian P.

A1 - Jepsen,Anders K.

A1 - Rossmeisl,Jan

A1 - Stephens,Ifan E. L.

A1 - Chorkendorff,Ib

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

PB - American Chemical Society

PY - 2012

Y1 - 2012

N2 - <p>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.</p>

AB - <p>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.</p>

U2 - 10.1021/ja306348d

DO - 10.1021/ja306348d

JO - American Chemical Society. Journal

JF - American Chemical Society. Journal

SN - 0002-7863

IS - 40

VL - 134

SP - 16476

EP - 16479

ER -