How to make electrocatalysts more active for direct methanol oxidation - Avoid PtRu bimetallic alloys!

被引：328

作者：

Long, JW

Stroud, RM

Swider-Lyons, KE

Rolison, DR

机构：

[1] USN, Res Lab, Surface Chem Branch, Washington, DC 20375 USA

[2] USN, Res Lab, Surface Modificat Branch, Washington, DC 20375 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 42期

关键词：

D O I：

10.1021/jp001954e

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：

Contrary to the current understanding of Pt-Ru electrocatalyzed oxidation of methanol, the bimetallic alloy is not the most desired form of the catalyst. In the nanoscale Pt-Ru blacks used to electrooxidize methanol in direct methanol fuel cells, (PtRu0)-Ru-0 has orders of magnitude less activity for methanol oxidation than does a mixed-phase electrocatalyst containing Pt metal and hydrous ruthenium oxides (RuOxHy). Bulk, rather than near-surface, quantities of electron-proton conducting RuOxHy are required to achieve high activity for methanol oxidation. The active catalyst forms a nanoscopic, phase-separated hydrons oxide-on-metal structure that retains the Pt metal-RuOxHy boundaries required to oxidize methanol fully to carbon dioxide and water.

引用

页码：9772 / 9776

页数：5

共 53 条

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