Abstract
Ordered intermetallic phases provide predictable control over structure and electronic effects, not afforded by the widely studied alloys. However, because of the lack of a unifying principle or model for controlling the ordering and particle size, it is still a great challenge to synthesize the desired ordered phase (5 nm and smaller). Here, we employ Pt3Cr as a typical ordered intermetallic phase to comprehensively study the factors that control both the ordering and particle size. Ordered Pt3Cr intermetallic nanoparticles (∼5 nm) are successfully synthesized using a KCl-matrix method in combination with adjusting annealing conditions. Such structurally ordered Pt3Cr/C exhibits superior kinetics toward the oxygen reduction reaction (ORR), relative to disordered PtCr alloy phases and commercial Pt/C. More importantly, the ordered Pt3Cr intermetallic catalyst shows a minimal loss of activity after 5000 potential cycles (14.7%) and a minimal Cr leaching loss after 4 weeks of testing (13.5%). The mechanism ...
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