Journal
JOURNAL OF CATALYSIS
Volume 345, Issue -, Pages 207-215Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.11.026
Keywords
Core-shell; Nanosheet; Oxygen reduction reaction; Hydrogen oxidation reaction; CO tolerance; Durability
Categories
Funding
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Japan Society for the Promotion of Science (JSPS) [16J09715]
- Public Foundation of Chubu Science and Technology Center
- Ubon Ratchatani University
- Grants-in-Aid for Scientific Research [16J09715] Funding Source: KAKEN
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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 112-151 m(2) (g-Pt)(-1), 1.4-1.9 times larger than typical Pt/C catalysts. A catalyst with a mono layer 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 H-2 as well as 300 ppm CO containing H-2, and better stability against potential cycling. (C) 2016 Elsevier Inc. All rights reserved.
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