Methanol resistant ruthenium electrocatalysts for oxygen reduction synthesized by pyrolysis of Ru3(CO)12 in different atmospheres

被引:20
作者
Altamirano-Gutierrez, A. [1 ]
Jimenez-Sandoval, O. [1 ]
Uribe-Godinez, J. [1 ]
Castellanos, R. H. [2 ]
Borja-Arco, E. [1 ]
Olivares-Ramirez, J. M. [3 ]
机构
[1] CINVESTAV, Inst Politecn Nacl, Unidad Queretaro, Queretaro 76001, Qro, Mexico
[2] Univ Papaloapan, Tuxtepec 68301, Oax, Mexico
[3] Univ Tecnol San Juan del Rio, San Juan Del Rio 76800, Qro, Mexico
关键词
Ruthenium; Electrocatalyst; Oxygen reduction; Polymer electrolyte fuel cell; Direct methanol fuel cell; FE-BASED CATALYSTS; ACID-MEDIUM; FUEL-CELLS; TRANSITION-METAL; IN-SITU; ELECTROREDUCTION; ELECTROLYTE; RU; KINETICS; NANOPARTICLES;
D O I
10.1016/j.ijhydene.2009.07.046
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
Novel ruthenium electrocatalysts for the oxygen reduction reaction (ORR) were prepared by pyrolysis of Ru-3(CO)(12) in three atmospheres: neutral (N-2), partially oxidative (air) and partially reductive (70:30 N-2/H-2), at temperatures in the 80-700 degrees C range. The materials were characterized by FT-IR spectroscopy, X-ray diffraction and scanning electron microscopy. A thermogravimetric analysis of the Ru-3(CO)(12) precursor in the three atmospheres was also performed. The electrocatalytic properties of the materials were evaluated by rotating disk electrode measurements in 0.5 mol L-1 H2SO4. The kinetic parameters, such as the Tafel slope, exchange current density and charge transfer coefficient, are reported. The catalysts prepared in N-2 and N-2/H-2, in general, show a higher performance than those synthesized in air. In the two nitrogen containing atmospheres, a pyrolysis temperature of 360 degrees C seems to lead to better electrocatalytic properties for the ORR. The new electrocatalysts are also tolerant to methanol concentrations as high as 2.0 mol L-1. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:7983 / 7994
页数:12
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