Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

被引：230

作者：

Escudero-Escribano, Maria ^{[1
]}

Verdaguer-Casadevall, Arnau ^{[1
]}

Malacrida, Paolo ^{[1
]}

Gronbjerg, Ulrik ^{[1
,2
]}

Knudsen, Brian P. ^{[1
]}

Jepsen, Anders K. ^{[1
]}

Rossmeisl, Jan ^{[2
]}

Stephens, Ifan E. L. ^{[1
]}

Chorkendorff, Ib ^{[1
]}

机构：

[1] Tech Univ Denmark DTU, Dept Phys, Ctr Individual Nanoparticle Funct, DK-2800 Lyngby, Denmark

[2] Tech Univ Denmark DTU, Dept Phys, Ctr Atom Scale Mat Design, DK-2800 Lyngby, Denmark

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 40期

基金：

新加坡国家研究基金会;

关键词：

REDUCTION ACTIVITY; PLATINUM; ELECTROCATALYSIS; ALLOY; STABILITY; PT(111);

D O I：

10.1021/ja306348d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：16476 / 16479

页数：4

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