Pt-Ru nanoparticles supported on functionalized carbon as electrocatalysts for the methanol oxidation

被引：29
|
作者：
Salgado, J. R. C. [1 ]
Fernandes, J. C. S. [1 ]
Botelho do Rego, A. M. [2 ,3 ]
Ferraria, A. M. [2 ,3 ]
Duarte, R. G. [1 ,4 ]
Ferreira, M. G. S. [1 ,5 ]
机构：
[1] Univ Tecn Lisboa, IST, ICEMS, P-1049001 Lisbon, Portugal
[2] Univ Tecn Lisboa, CQFM, P-1049001 Lisbon, Portugal
[3] Univ Tecn Lisboa, IN, IST, P-1049001 Lisbon, Portugal
[4] ESTBarreiro, Inst Politecn Setubal, P-2839001 Barreiro, Portugal
[5] Univ Aveiro, CICECO, P-3810193 Aveiro, Portugal
来源：
ELECTROCHIMICA ACTA | 2011年 / 56卷 / 24期
关键词：
Pt-Ru electrocatalyst; Functionalized carbon; Oxygenated groups; Methanol oxidation; ORDERED MESOPOROUS CARBON; FUEL-CELL APPLICATIONS; PLATINUM CATALYSTS; PARTICLE-SIZE; XRD ANALYSIS; ELECTROOXIDATION; ALLOYS; IMPEDANCE; BLACK; ANODE;
D O I：
10.1016/j.electacta.2011.07.039
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Platinum-ruthenium alloy electrocatalysts, for methanol oxidation reaction, were prepared on carbons thermally treated in helium atmosphere or chemically functionalized in H2O2, or in HNO3 + H2SO4 or in HNO3 solutions. The functionalized carbon that is produced using acid solutions contains more surface oxygenated functional groups than carbon treated with H2O2 solution or HeTT. The XRD/HR-TEM analysis have showed the existence of a higher alloying degree for Pt-Ru electrocatalysts supported on functionalized carbon, which present superior electrocatalytic performance, assessed by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy, as compared to electrocatalysts on unfunctionalized carbon. It also was found that Pt-Ru alloy electrocatalysts on functionalized carbon improve the reaction rate compared to Pt-Ru on carbons treated with H2O2 solution and thermally. A mechanism is discussed, where oxygenated groups generated from acid functionalization of carbon and adsorbed on Pt-Ru electrocatalysts are considered to enhance the electrocatalytic activity of the methanol oxidation reaction. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：8509 / 8518
页数：10
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