Effects of Silicotungstic Acid Addition to the Electrodes of Polymer Electrolyte Membrane Fuel Cells

被引：14

作者：

Brooker, R. Paul ^{[1
]}

Baker, Phillip ^{[2
]}

Kunz, H. Russell ^{[2
]}

Bonville, Leonard J. ^{[2
]}

Parnas, Richard ^{[2
]}

机构：

[1] Florida Solar Energy Ctr, Cocoa, FL 32922 USA

[2] Univ Connecticut, Dept Chem Mat & Biomol Engn, Storrs, CT 06269 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 11期

关键词：

OXYGEN REDUCTION; COMPOSITE MEMBRANES; RELATIVE-HUMIDITY; HETEROPOLY ACIDS; PEMFC OPERATION; TEMPERATURE; CATALYST; NAFION; PERFORMANCE; MORPHOLOGY;

D O I：

10.1149/1.3216001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Operation of polymer electrolyte membrane fuel cells at elevated temperatures and low relative humidity is limited by the electrolyte's dependence on water. The addition of a heteropolyacid, specifically silicotungstic acid (STA), is shown to increase the activity of platinum for the oxygen reduction reaction by nearly 73% at 118 degrees C/40% relative humidity. However, STA-containing electrodes have a significantly higher diffusion resistance, countering any activity improvement at higher currents. By reducing the electrode ionomer weight fraction, the diffusion resistance decreases. Also, membrane durability is improved significantly by including STA at the cathode. (C) 2009 The Electrochemical Society. [DOI:10.1149/1.3216001] All rights reserved.

引用

收藏

页码：B1317 / B1321

页数：5

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