Investigating the activity enhancement on PtxCo1−x alloys induced by a combined strain and ligand effect
作者： Ioannis Spanos , Jacob J.K. Kirkensgaard , Kell Mortensen , Matthias Arenz
DOI: 10.1016/J.JPOWSOUR.2013.07.023
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摘要: Abstract Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that give PtxCo1−x alloy nanoparticles (NPs) supported on a commercial carbon black support (Ketjen EC300J) with controlled particle size, Co content and distribution (ORR). The prepared samples can be pre-leached in acid solution obtain skeleton NPs heat-treated reducing atmosphere promote alloying well reduce number low coordinated surface sites NPs. Without heat treatment, exhibit an increase mainly due strain effect, whereas improved performance combined ligand effect requires thermal treatment catalyst.
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