Synthesis and characterization of Os and Pt-Os/carbon nanocomposites and their relative performance as methanol electrooxidation catalysts

被引：37

作者：

Moore, JT

Chu, D

Jiang, RZ

Deluga, GA

Lukehart, CM ^{[1
]}

机构：

[1] Vanderbilt Univ, Dept Chem, Nashville, TN 37235 USA

[2] USA, Res Lab, Electrochem Branch, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA

[3] Univ Minnesota, Corros Res Ctr, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

来源：

CHEMISTRY OF MATERIALS | 2003年 / 15卷 / 05期

关键词：

D O I：

10.1021/cm011565c

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：

Thermal treatment of cis-(2,2'-bipyridine)(2)OSCl2, (eta(6)-cymene)(2)Os2Cl4, or [(bpy)(2)Os(mu-bpm)-PtCl2] [CF3SO3](2)/Vulcan carbon powder composites under solely reductive conditions affords Os or Pt-Os/carbon nanocomposites consisting of metal nanoparticles highly dispersed on the carbon support. Nanocomposites containing ca. 35-50 wt% metal with metal nanocrystals of ca. 5-6 nm average diameter are formed. Evaluation of the performance of these nanocomposites as methanol electrooxidation catalysts in direct methanol fuel cells and in an electrochemical cell designed for combinatorial testing reveals that, although the Os/ carbon nanocomposites and the Pt-Os alloy/carbon nanocomposite give open circuit potentials indicative of thermodynamically favorable methanol oxidation, the kinetics of these oxidations are too low to be of practical importance. Unfortunately, the Os-containing electrocatalysts prepared by this synthesis strategy did not exhibit high performance for methanol oxidations as predicted by theoretical computations.

引用

页码：1119 / 1124

页数：6

共 36 条

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