Preparation of methanol oxidation electrocatalysts: ruthenium deposition on carbon-supported platinum nanoparticles

被引：48
作者：
Maillard, F [1 ]
Gloaguen, F [1 ]
Leger, JM [1 ]
机构：
[1] Univ Poitiers, LACCO, Equipe Electrocatalyse, CNRS,UMR 6503, F-86022 Poitiers, France
来源：
JOURNAL OF APPLIED ELECTROCHEMISTRY | 2003年 / 33卷 / 01期
关键词：
electrocatalysis; methanol electrooxidation; nanoparticles; PtRu electrodes; Ru deposition;
D O I：
10.1023/A:1022906615060
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Methanol oxidation electrocatalysts were prepared from Ru electrochemical or spontaneous deposition on commercial-grade carbon-supported Pt nanoparticles (Pt-Vulcan XC72, E-TEK). The resulting Ru coverage was estimated by cyclic voltammetry in supporting electrolyte. The maximum electrocatalytic activity for methanol oxidation at room temperature was observed at lower Ru coverage for spontaneous deposition than for electrodeposition; theta(Ru) similar to 10% vs similar to20%, respectively. On the other hand, higher current densities for methanol oxidation were obtained in the case of electrodeposited Ru. These two results were related to the presence of non-reducible ruthenium oxides in the spontaneous deposit. The present work provides evidence that (i) efficient DMFC electrocatalysts can be achieved by Ru deposition on Pt nanoparticles, and (ii) formation of a PtRu alloy is not a required condition for effective methanol electrooxidation.
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页码：1 / 8
页数：8
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