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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.