Linked Life Data

20644761

Source:http://linkedlifedata.com/resource/pubmed/id/20644761

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2010-7-20
pubmed:abstractText
We present the controlled synthesis of bimetallic Pt(x)Fe(1-x) nanoparticles with tunable physical properties and a study of their catalytic activity towards the oxygen reduction reaction (ORR). Composition-induced variations in alloying extent and Pt d-band vacancies in Pt-Fe/C catalysts are systematically investigated. Density functional theoretical calculations are performed in order to realize the electronic effect caused by alloying Pt with Fe. The DFT computational observations revealed that iron donates electrons to platinum, when the Fe 3d and Pt 5d orbitals undergo hybridization. The Pt(x)Fe(1-x) catalysts with various Pt-to-Fe atomic ratios are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV), and X-ray absorption spectroscopy (XAS). TEM images indicate that the dispersion of the metal nanoparticles is uniform and the XAS technique provides significant insight on Pt d-band vacancies and the alloying extent of Pt and Fe in Pt(x)Fe(1-x) nanoparticles. Rotating-disk voltammetry of Pt(x)Fe(1-x) nanoparticle catalysts with various Pt : Fe atomic compositions (3 : 1, 1 : 1, and 1 : 3) revealed that the Pt(1)Fe(1)/C nanocatalyst showed a greater enhancement in ORR activity than platinum. The enhanced catalytic activity toward ORR is attributed to the higher alloying extent of platinum and iron as well as the promising electronic structure offered by the lower unfilled Pt d states in Pt(x)Fe(1-x) nanoparticles when compared to pure Pt.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
2040-3372
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
573-81
pubmed:dateRevised
2011-8-25
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Tunable properties of PtxFe1-x electrocatalysts and their catalytic activity towards the oxygen reduction reaction.
pubmed:affiliation
Nanoelectrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science & Technology, Taipei 106, Taiwan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't