Hollow Au@Pd and Au@Pt core-shell nanoparticles as electrocatalysts for ethanol oxidation reactions

Handle URI:
http://hdl.handle.net/10754/575902
Title:
Hollow Au@Pd and Au@Pt core-shell nanoparticles as electrocatalysts for ethanol oxidation reactions
Authors:
Song, Hyon Min; Anjum, Dalaver H.; Sougrat, Rachid; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Khashab, Niveen M. ( 0000-0003-2728-0666 )
Abstract:
Hybrid alloys among gold, palladium and platinum become a new category of catalysts primarily due to their enhanced catalytic effects. Enhancement means not only their effectiveness, but also their uniqueness as catalysts for the reactions that individual metals may not catalyze. Here, preparation of hollow Au@Pd and Au@Pt core-shell nanoparticles (NPs) and their use as electrocatalysts are reported. Galvanic displacement with Ag NPs is used to obtain hollow NPs, and higher reduction potential of Au compared to Ag, Pd, and Pt helps to produce hollow Au cores first, followed by Pd or Pt shell growth. Continuous and highly crystalline shell growth was observed in Au@Pd core-shell NPs, but the sporadic and porous-like structure was observed in Au@Pt core-shell NPs. Along with hollow core-shell NPs, hollow porous Pt and hollow Au NPs are also prepared from Ag seed NPs. Twin boundaries which are typically observed in large size (>20 nm) Au NPs were not observed in hollow Au NPs. This absence is believed to be due to the role of the hollows, which significantly reduce the strain energy of edges where the two lattice planes meet. In ethanol oxidation reactions in alkaline medium, hollow Au@Pd core-shell NPs show highest current density in forward scan. Hollow Au@Pt core-shell NPs maintain better catalytic activities than metallic Pt, which is thought to be due to the better crystallinity of Pt shells as well as the alloy effect of Au cores. © 2012 The Royal Society of Chemistry.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Advanced Nanofabrication, Imaging and Characterization Core Lab; Advanced Membranes and Porous Materials Research Center; Core Labs; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Smart Hybrid Materials (SHMs) lab
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Journal of Materials Chemistry
Issue Date:
27-Sep-2012
DOI:
10.1039/c2jm35281h
Type:
Article
ISSN:
09599428
Sponsors:
We gratefully acknowledge King Abdullah University of Science and Technology (KAUST) for the support of this work.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Physical Sciences and Engineering (PSE) Division; Controlled Release and Delivery Laboratory; Controlled Release and Delivery Laboratory; Chemical Science Program; Chemical Science Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSong, Hyon Minen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorSougrat, Rachiden
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorKhashab, Niveen M.en
dc.date.accessioned2015-08-25T06:18:47Zen
dc.date.available2015-08-25T06:18:47Zen
dc.date.issued2012-09-27en
dc.identifier.issn09599428en
dc.identifier.doi10.1039/c2jm35281hen
dc.identifier.urihttp://hdl.handle.net/10754/575902en
dc.description.abstractHybrid alloys among gold, palladium and platinum become a new category of catalysts primarily due to their enhanced catalytic effects. Enhancement means not only their effectiveness, but also their uniqueness as catalysts for the reactions that individual metals may not catalyze. Here, preparation of hollow Au@Pd and Au@Pt core-shell nanoparticles (NPs) and their use as electrocatalysts are reported. Galvanic displacement with Ag NPs is used to obtain hollow NPs, and higher reduction potential of Au compared to Ag, Pd, and Pt helps to produce hollow Au cores first, followed by Pd or Pt shell growth. Continuous and highly crystalline shell growth was observed in Au@Pd core-shell NPs, but the sporadic and porous-like structure was observed in Au@Pt core-shell NPs. Along with hollow core-shell NPs, hollow porous Pt and hollow Au NPs are also prepared from Ag seed NPs. Twin boundaries which are typically observed in large size (>20 nm) Au NPs were not observed in hollow Au NPs. This absence is believed to be due to the role of the hollows, which significantly reduce the strain energy of edges where the two lattice planes meet. In ethanol oxidation reactions in alkaline medium, hollow Au@Pd core-shell NPs show highest current density in forward scan. Hollow Au@Pt core-shell NPs maintain better catalytic activities than metallic Pt, which is thought to be due to the better crystallinity of Pt shells as well as the alloy effect of Au cores. © 2012 The Royal Society of Chemistry.en
dc.description.sponsorshipWe gratefully acknowledge King Abdullah University of Science and Technology (KAUST) for the support of this work.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleHollow Au@Pd and Au@Pt core-shell nanoparticles as electrocatalysts for ethanol oxidation reactionsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentCore Labsen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentSmart Hybrid Materials (SHMs) laben
dc.identifier.journalJournal of Materials Chemistryen
kaust.authorSougrat, Rachiden
kaust.authorHedhili, Mohamed N.en
kaust.authorKhashab, Niveen M.en
kaust.authorSong, Hyon Minen
kaust.authorAnjum, Dalaver H.en
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