Direct Synthesis of Intermetallic Platinum-Alloy Nanoparticles Highly-Loaded on Carbon Supports for Efficient Electrocatalysis
- Direct Synthesis of Intermetallic Platinum-Alloy Nanoparticles Highly-Loaded on Carbon Supports for Efficient Electrocatalysis
- 유성종; 이동욱; 이응준; 유태용; 유지문; Arun Kumar Sinha; Megalamane S. Bootharaju; 정위연; 이현석; 이병훈; 김지현; Wytse Hooch Antink; 김용민; 이종민; 조성표; 성영은; 현택환
- Issue Date
- Journal of the American Chemical Society
- VOL 142, NO 33-14200
- Compared to nanostructured platinum (Pt) catalysts, ordered Pt-based intermetallic nanoparticles supported on a carbon substrate exhibit much enhanced catalytic performance, especially in fuel cell electrocatalysis. However, direct synthesis of homogeneous intermetallic alloy nanocatalysts on carbonaceous supports with high loading is still challenging. Herein, we report a novel synthetic strategy to directly produce highly dispersed MPt alloy nanoparticles (M = Fe, Co, or Ni) on various carbon supports with high catalyst loading. Importantly, a unique bimetallic compound, composed of [M(bpy)3]2+ cation (bpy = 2,2′-bipyridine) and [PtCl6]2？ anion, evenly decomposes on carbon surface and forms uniformly sized intermetallic nanoparticles with a nitrogen-doped carbon protection layer. The excellent oxygen reduction reaction (ORR) activity and stability of the representative reduced graphene oxide (rGO)-supported L10-FePt catalyst (37 wt %-FePt/rGO), exhibiting 18.8 times higher specific activity than commercial Pt/C catalyst without degradation over 20？000 cycles, well demonstrate the effectiveness of our synthetic approach toward uniformly alloyed nanoparticles with high homogeneity.
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