Monodisperse Pt3Co nanoparticles as electrocatalyst: the effects of particle size and pretreatment on electrocatalytic reduction of oxygen

被引：122

作者：

Wang, Chao ^{[1
]}

Wang, Guofeng ^{[2
]}

van der Vliet, Dennis ^{[1
]}

Chang, Kee-Chul ^{[1
]}

Markovic, Nenad M. ^{[1
]}

Stamenkovic, Vojislav R. ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Indiana Univ Purdue Univ, Dept Mech Engn, Indianapolis, IN 46202 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 26期

关键词：

EMBEDDED-ATOM POTENTIALS; ALLOY CATALYSTS; NANOCRYSTALS; PLATINUM; SEGREGATION; NI;

D O I：

10.1039/c000822b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Monodisperse Pt3Co nanoparticles have been synthesized with size control via an organic solvothermal approach. The obtained nanoparticles were incorporated into a carbon matrix and applied as electrocatalysts for the oxygen reduction reaction to investigate the effects of particle size and pretreatment on their catalytic performance. It has been found that the optimal conditions for maximum mass activity were with particles of similar to 4.5 nm and a mild annealing temperature of about 500 degrees C. While the particle size effect can be correlated to the average surface coordination number, Monte Carlo simulations have been introduced to depict the nanoparticle structure and segregation pro. le, which revealed that the annealing temperature has a direct influence on the particle surface relaxation, segregation and adsorption/catalytic properties. The obtained fundamental understanding of activity enhancement in Pt-bimetallic alloy catalysts could be utilized to guide the development of advanced nanomaterials for catalytic applications.

引用

页码：6933 / 6939

页数：7

共 47 条

[1] Colloquium:: Opportunities in nanomagnetism [J].