Performing CO tolerant anode catalyst for polymer electrolyte fuel cells

摘要

High energy ball-milling of Pt, Ru, and Al in a 1:1:8 atomic ratio has been used to produce CO tolerant unsupported Pt-Ru based catalysts for the oxidation of hydrogen in polymer electrolyte fuel cells. After leaching Al, this catalyst [Pt_(0.5)-Ru_(0.5)(Al_4)] displays a specific area of 38 m~2/g. It shows hydrogen oxidation performance and CO tolerance equivalent to those of Pt_(0.5)-Ru_(0.5) Black from Johnson Matthey, the commercial catalyst which was found to be the most CO tolerant one in this study. Pt_(0.5)-Ru_(0.3)(Al_4) is a composite catalyst. It consists of two components: (i) small crystallites (approx 4 nm) of a Pt-l solid solution (1-3 Al wt