Effects of contaminants on catalyst activity
Advances in Electrocatalysis, Materials, Diagnostics and Durability
Electrocatalyst materials for low temperature fuel cells
Published Online: 15 DEC 2010
Copyright © John Wiley & Sons, Ltd. All rights reserved.
Handbook of Fuel Cells
How to Cite
Garzon, F. H. and Uribe, F. A. 2010. Effects of contaminants on catalyst activity. Handbook of Fuel Cells. .
- Published Online: 15 DEC 2010
Hydrogen fuel and ambient air contaminants that exhibit strong electrode catalyst chemisorption may severely degrade the performance of polymer membrane fuel cells. Common fuel-reforming impurities include carbon monoxide and hydrogen sulfide and air impurities include sulfur oxides and nitrogen oxides. CO contamination at parts per million (ppm) levels severely affects fuel cell performance; however, a number of methods including depolarization, air bleeding, and CO tolerant catalyst alloys will mitigate the performance losses. In contrast, the deposition of S on Pt surface from adsorption of sub-ppm levels of H2S in the H2-fuel stream results in severe fuel cell performance degradation. The oxidative removal of adsorbed S is a kinetically hindered process and is not achievable at reasonable rates in normal fuel cell operation.
- fuel cells;
- catalyst activity;
- impurity tolerance;