Oxygen Electroreduction on PtCo3, PtCo and Pt3Co Alloy Nanoparticles for Alkaline and Acidic PEM Fuel Cells

被引:139
作者
Oezaslan, Mehtap [1 ]
Hasche, Frederic [1 ]
Strasser, Peter [1 ]
机构
[1] Tech Univ Berlin, Dept Chem, Div Chem Engn, Electrochem Energy Catalysis & Mat Sci Lab, D-10623 Berlin, Germany
关键词
HIGH-SURFACE-AREA; ACTIVITY-STABILITY RELATIONSHIPS; HIGH ELECTROCATALYTIC ACTIVITY; RING-DISK ELECTRODE; REDUCTION REACTION; CO NANOPARTICLES; CATHODE CATALYST; METAL-SURFACES; PARTICLE-SIZE; PLATINUM;
D O I
10.1149/2.075204jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Pt-Co alloy nanoparticles have emerged as one of the most promising electrocatalysts for the oxygen reduction reaction (ORR) in hydrogen fuel cells. Our study presents a comprehensive structural, compositional and electrochemical characterization linked with ORR activity for carbon supported PtCo3, PtCo, and Pt3Co alloy nanoparticle catalysts in 0.1 M HClO4 and 0.1 M KOH. Surface-sensitive cyclic voltammetry was used to investigate the changes of composition of outermost atomic layers of Pt-Co alloys. Our electrochemical results in alkaline media clearly show the stability and voltage-induced accumulation of Co on the particle surface, whereas in 0.1 M HClO4 the voltage cycling initiates the rapid dissolution of Co to form a Pt-enriched surface surrounding by alloy core. We correlated the ECSA and ORR activity with the as-synthesized chemical composition of Pt-Co alloys. In results, after electrochemical treatment in 0.1 M HClO4 the Pt mass based activities (j(mass)) increase according: Pt(HT) < PtCo < Pt3Co < PtCo3 at comparable particle size. Unlike to acid, after voltage cycling in 0.1 M KOH j(mass) increase according: PtCo3 < Pt(HT) < PtCo < Pt3Co. However, in 0.1 M KOH activated PtCo3 core-shell catalyst shows 4-5 fold higher mass activity compared to pure Pt and Pt(HT). (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.075204jes] All rights reserved.
引用
收藏
页码:B394 / B405
页数:12
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