Electroreduction of oxygen on Pt nanoparticle/carbon nanotube nanocomposites in acid and alkaline solutions

被引：72

作者：

Alexeyeva, N. ^{[1
]}

Tammeveski, K. ^{[1
]}

Lopez-Cudero, A. ^{[2
]}

Solla-Gullon, J. ^{[2
]}

Feliu, J. M. ^{[2
]}

机构：

[1] Univ Tartu, Inst Chem, EE-51014 Tartu, Estonia

[2] Univ Alicante, Inst Electroquim, E-03080 Alicante, Spain

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 03期

关键词：

Oxygen reduction; Electrocatalysis; Platinum nanoparticles; Carbon nanotubes; SINGLE-CRYSTAL SURFACES; MULTIWALLED CARBON NANOTUBES; REDUCTION REACTION-KINETICS; PLATINUM STEPPED SURFACES; ION-EXCHANGE METHOD; PARTICLE-SIZE; ELECTROCHEMICAL REDUCTION; CATALYST SUPPORT; METHANOL OXIDATION; HIGH DISPERSION;

D O I：

10.1016/j.electacta.2009.09.030

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The kinetics of O-2 reduction on novel electrocatalyst materials deposited on carbon substrates were studied in 0.5 M H2SO4 and in 0.1 M NaOH solutions using the rotating disk electrode (RDE) technique. Pt nanoparticles (PtNP) supported on single-walled (PtNP/SWCNT) and multi-walled carbon nanotubes (PtNP/MWCNT) were prepared using two different synthetic routes. Before use, the CNTs were cleaned to minimize the presence of metal impurities coming from the catalyst used in the synthesis of this material, which can interfere in the electrochemical response of the supported Pt nanoparticles. The composite catalyst samples were characterised by transmission electron microscopy (TEM) showing a good dispersion of the particles at the surface of the carbon support and an average Pt particle size of 2.4 +/- 0.7 nm in the case of Pt/CNTs prepared in the presence of citrate and of 3.8 +/- 1.1 nm for Pt/CNTs prepared in microemulsion. The values of specific activity (SA) and other kinetic parameters were determined from the Tafel plots taking into account the real electroactive area of each electrode. The electrodes exhibited a relatively high electrocatalytic activity for the four-electron oxygen reduction reaction to water. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：794 / 803

页数：10

共 75 条

[1]

Adzic R, 1998, FRONT ELECT, P197

[2] Electrochemical reduction of oxygen on multiwalled carbon nanotube modified glassy carbon electrodes in acid media [J].