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Small palladium islands embedded in palladium-tungsten bimetallic nanoparticles form catalytic hotspots for oxygen reduction
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.ORCID-id: 0000-0001-9239-0541
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2014 (engelsk)Inngår i: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, s. Article number: 5253-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The sluggish kinetics of the oxygen reduction reaction at the cathode side of proton exchange membrane fuel cells is one major technical challenge for realizing sustainable solutions for the transportation sector. Finding efficient yet cheap electrocatalysts to speed up this reaction therefore motivates researchers all over the world. Here we demonstrate an efficient synthesis of palladium-tungsten bimetallic nanoparticles supported on ordered mesoporous carbon. Despite a very low percentage of noble metal (palladium: tungsten = 1:8), the hybrid catalyst material exhibits a performance equal to commercial 60% platinum/Vulcan for the oxygen reduction process. The high catalytic efficiency is explained by the formation of small palladium islands embedded at the surface of the palladium-tungsten bimetallic nanoparticles, generating catalytic hotspots. The palladium islands are similar to 1 nm in diameter, and contain 10-20 palladium atoms that are segregated at the surface. Our results may provide insight into the formation, stabilization and performance of bimetallic nanoparticles for catalytic reactions.

sted, utgiver, år, opplag, sider
Macmillan Publishers Ltd., 2014. Vol. 5, s. Article number: 5253-
Emneord [en]
chemical sciences, catalysis, materials science
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-96958DOI: 10.1038/ncomms6253ISI: 000343985400002OAI: oai:DiVA.org:umu-96958DiVA, id: diva2:771070
Tilgjengelig fra: 2014-12-12 Laget: 2014-12-05 Sist oppdatert: 2019-10-17bibliografisk kontrollert

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