Effect of a thermal treatment on the activity of carbon-supported Pt, Pt+W and Pt+Mo electrocatalysts for methanol oxidation reactions

被引：2

作者：

Gökagaç, G ^{[1
]}

Leger, JM

Hahn, F

机构：

[1] Middle E Tech Univ, Dept Chem, TR-06531 Ankara, Turkey

[2] Univ Poitiers, CNRS, UMR 6503, Equipe Electrocatalyse, F-86022 Poitiers, France

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2001年 / 56卷 / 12期

关键词：

methanol oxidation; infrared reflectance spectroscopy; carbon-supported catalysts;

D O I：

10.1515/znb-2001-1209

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Previous studies on carbon supported Pt, Pt+W and Pt+Mo indicated that Pt+Mo was the most active electrocatalyst at low potentials and that Pt+W has similar properties as pure Pt in methanol oxidation. Those samples were thermally treated at 900 degreesC in a hydrogen gas atmosphere for 6 hours to observe the effect on metal particle sizes and on their distribution on carbon support. It was found that thermally treated Pt+Mo/XC-72 remains the most active catalyst at all potentials compared to the other heated samples. The heat treatment caused the sintering of small particles leading to a decrease in activity of the catalysts except Pt+Mo/XC-72. The heat treated samples were characterised by voltammetry, X-ray diffraction, transmission electron microscopy and energy dispersive X-ray analysis techniques. The methanol oxidation reaction was followed by in-situ FTIR spectroscopy to identify products and adsorbed species on the surface of electrode.

引用

页码：1306 / 1314

页数：9

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