14 March 2003
Vol 299, Issue 5613

About The Cover

Cover image expansion

COVER The transition state for the catalytic oxidation of carbon monoxide (CO) by a hydroxyl intermediate over a model platinum/ruthenium surface in solution, as determined by quantum mechanical calculations. This path removes CO from the anode of a proton exchange membrane fuel cell. Platinum, ruthenium, carbon, oxygen, and hydrogen atoms are colored turquoise, yellow, green, red, and white, respectively. 1683 [Image: Matthew Neurock]