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Ru-core@Pt-shell nanosheet for fuel cell electrocatalysts with high activity and durability
- Takimoto, Daisuke, Ohnishi, Tomohiro, Nutariya, Jeerapat, Shen, Zhongrong, Ayato, Yusuke, Mochizuki, Dai, Demortière, Arnaud, Boulineau, Adrien, Sugimoto, Wataru
- Journal of catalysis 2017 v.345 pp. 207-215
- anodes, carbon, catalysts, cathodes, durability, electrochemistry, electrolytes, fuel cells, hydrogen, nanosheets, oxidation, polymers, surface area
- Pt-based electrocatalysts with higher activity and durability are necessary for cost-competitive polymer electrolyte membrane fuel cells. We have combined the high utilization and activity of core@shell nanostructures with the high surface area and stability of atomically thin nanosheets to afford electrocatalysts that show enhanced activity and durability for both cathode and anode reactions. Ru-core@Pt-shell nanosheets with an average thickness of 1.5–4.5 Pt monolayers have an electrochemically active Pt surface area of 112–151m²(g-Pt)⁻¹, 1.4–1.9 times larger than typical Pt/C catalysts. A catalyst with a monolayer Ru-core and an average 3.5 monolayer Pt-shell supported on carbon (Ru@Pt-3.5ML(ns)/C) shows 4.5 times higher mass activity than benchmark Pt/C catalyst for the oxygen reduction reaction with a slower degradation rate, making this nanomaterial one of the most active and durable Pt-based catalysts. For the anode reactions, Ru@Pt-1.5ML(ns)/C shows 2 times higher apparent mass activity for the hydrogen oxidation activity in pure H2 as well as 300ppm CO containing H2, and better stability against potential cycling.