Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction
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Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction. / Escudero-Escribano, Maria; Verdaguer-Casadevall, Arnau; Malacrida, Paolo; Gronbjerg, Ulrik; Knudsen, Brian P.; Jepsen, Anders K.; Rossmeisl, Jan; Stephens, Ifan E. L.; Chorkendorff, Ib.
I: Journal of the American Chemical Society, Bind 134, Nr. 40, 2012, s. 16476-16479.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction
AU - Escudero-Escribano, Maria
AU - Verdaguer-Casadevall, Arnau
AU - Malacrida, Paolo
AU - Gronbjerg, Ulrik
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
VL - 134
SP - 16476
EP - 16479
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 40
ER -
ID: 274921743