Adsorbate-Induced Surface Segregation for Core-Shell Nanocatalysts

被引：273

作者：

Mayrhofer, Karl J. J. ^{[1
]}

Juhart, Viktorija ^{[1
]}

Hartl, Katrin ^{[1
]}

Hanzlik, Marianne ^{[1
]}

Arenz, Matthias ^{[2
]}

机构：

[1] Tech Univ Munich, Lehrstuhl Phys Chem, D-85748 Garching, Germany

[2] Tech Univ Munich, Inst Elektronenmikroskopie, D-85748 Garching, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2009年 / 48卷 / 19期

关键词：

core-shell nanoparticles; fuel cells; supported catalysis; oxygen reduction; surface segregation; O-2; REDUCTION; ALLOYS; OXYGEN; ELECTROCATALYSIS; CHEMISORPTION; CATALYSTS;

D O I：

10.1002/anie.200806209

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Coming to the surface: The surface composition of carbon-supported Pt 3Co catalyst particles changes upon a CO-annealing treatment. Platinum atoms segregate to the particle surface so that nanoparticles with a platinum shell surrounding an alloy core are formed. This modified catalyst has a superior activity in the oxygen reduction reaction compared to both a plain platinum catalyst and the untreated alloy particles. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

引用

页码：3529 / 3531

页数：3

共 21 条

[1] The effect of the particle size on the kinetics of CO electrooxidation on high surface area Pt catalysts [J].

Arenz, M ;

Mayrhofer, KJJ ;

Stamenkovic, V ;

Blizanac, BB ;

Tomoyuki, T ;

Ross, PN ;

Markovic, NM .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (18) :6819-6829

[2] CO CHEMISORPTION ON THE [111] AND [100] ORIENTED SINGLE-CRYSTAL SURFACES OF THE ALLOY COPT3 [J].

BARDI, U ;

BEARD, BC ;

ROSS, PN .

JOURNAL OF CATALYSIS, 1990, 124 (01) :22-29

[3] Phase diagrams for surface alloys [J].

Christensen, A ;

Ruban, AV ;

Stoltze, P ;

Jacobsen, KW ;

Skriver, HL ;

Norskov, JK ;

Besenbacher, F .

PHYSICAL REVIEW B, 1997, 56 (10) :5822-5834

[4] Adsorption sites and ligand effect for CO on an alloy surface: a direct view [J].

Gauthier, Y ;

Schmid, M ;

Padovani, S ;

Lundgren, E ;

Bus, V ;

Kresse, G ;

Redinger, J ;

Varga, P .

PHYSICAL REVIEW LETTERS, 2001, 87 (03) :36103-1

[5] Structure-activity-stability relationships of Pt-Co alloy electrocatalysts in gas-diffusion electrode layers [J].

Koh, Shirlaine ;

Leisch, Jennifer ;

Toney, Michael F. ;

Strasser, Peter .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (09) :3744-3752

[6] Promotion through gas phase induced surface segregation:: methanol synthesis from CO, CO2 and H2 over Ni/Cu(100) [J].

Nerlov, J ;

Chorkendorff, I .

CATALYSIS LETTERS, 1998, 54 (04) :171-176

[7] Preparation and characterisation of platinum- and gold-coated copper, iron, cobalt and nickel deposits on glassy carbon substrates [J].

Papadimitriou, S. ;

Tegou, A. ;

Pavlidou, E. ;

Armyanov, S. ;

Valova, E. ;

Kokkinidis, G. ;

Sotiropoulos, S. .

ELECTROCHIMICA ACTA, 2008, 53 (22) :6559-6567

[8] Alloy catalysts: the concepts [J].

Ponec, V .

APPLIED CATALYSIS A-GENERAL, 2001, 222 (1-2) :31-45

[9] SURFACE COMPOSITION AND CATALYSIS ON ALLOYS [J].

PONEC, V .

SURFACE SCIENCE, 1979, 80 (01) :352-366

[10]

Pourbaix M., 1974, Atlas of Electrochemical Equilibria in Aqueous Solutions

← 1 2 3 →