Synthesis and characterization of osmium carbonyl cluster compounds with molecular oxygen electroreduction capacity

被引：15

作者：

Castellanos, RH ^{[1
]}

Ocampo, AL ^{[1
]}

Moreira-Acosta, J ^{[1
]}

Sebastian, PJ ^{[1
]}

机构：

[1] Univ Nacl Autonoma Mexico, Solar Energy Lab, Photovoltaic Syst Grp, CIE, Temixco 62580, Morelos, Mexico

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2001年 / 26卷 / 12期

关键词：

oxygen reduction; PEW fuel cell; osmium carbonyl compound; voltametry; Tafel plot;

D O I：

10.1016/S0360-3199(01)00070-2

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：

A transition metal cluster electrocatalyst based on Os-x(CO)(n) was synthesized by pyrolysis of Os-3(CO)(12) in 1,2-Dichlorobenzene (b.p. approximate to 180 degreesC) under inert atmosphere (N-2). The electrocatalytic parameters of the oxygen reduction reaction (ORR) for an Os-x(CO)(n) catalyst were studied with a rotating disk electrode in 0.5 M H2SO4 electrolyte. The diffusion coefficient and solubility of O-2 in 0.5 M H2SO4 were calculated. Koutecky-Levich analysis of the linear voltamperometry data showed that the reaction follows first-order kinetics and the value of the Koutecky-Levich slope indicates a multielectron charge transfer during the ORR. The value of the Tafel slope obtained from the mass transfer corrected Tafel plots is 131 mV/decade. The performance of the catalyst in a H-2/O-2 PEM fuel cell cathode was evaluated and found to be nearly as good as that of Pt. (C) 2001 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：1301 / 1306

页数：6

共 21 条

[1] THE SYNTHESIS, STRUCTURES, BONDING AND UNUSUAL REACTIVITY OF SULFIDO OSMIUM CARBONYL CLUSTER COMPOUNDS [J].