In situ Stark effects with inverted bipolar peaks for adsorbed CO on Pt electrodes in 50°C direct methanol fuel cells

被引：29

作者：

Bo, AL ^{[1
]}

Sanicharane, S ^{[1
]}

Sompalli, B ^{[1
]}

Fan, QB ^{[1
]}

Gurau, B ^{[1
]}

Liu, RX ^{[1
]}

Smotkin, ES ^{[1
]}

机构：

[1] IIT, Ctr Electrochem Sci & Engn, Chicago, IL 60616 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 31期

关键词：

D O I：

10.1021/jp000222j

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：

Adsorbed CO Stark tuning rates have been studied for the first time in direct methanol fuel cells on Pt black catalysts supported only on the polymer electrolyte (Nafion) in membrane electrode assemblies. The bipolar peaks resulting from the Stark shift of CO absorbance peaks are inverted, indicating an anomalous increase in the reflectivity where CO infrared absorption occurs. The vibrational Stark tuning data suggests that CO oxidation occurs on the perimeter of COads islands, which is consistent with the formation of CO within and above Pt double layer potentials as reported by Kunimatsu. This is expected since methanol is continuously delivered to the anode at all potentials in direct methanol fuel cells.

引用

页码：7377 / 7381

页数：5

共 31 条

[1] THEORY FOR C-N- AND AG-C VIBRATIONAL FREQUENCY-DEPENDENCE ON POTENTIAL - CYANIDE ON A SILVER ELECTRODE [J].