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Title:Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalyst
Authors:Pavlišič, Andraž (Author)
Jovanovič, Primož (Author)
Šelih, Vid Simon (Author)
Šala, Martin (Author)
Bele, Marjan (Author)
Dražić, Goran (Author)
Arčon, Iztok (Author)
Hočevar, Samo B. (Author)
Kokalj, Anton (Author)
Hodnik, Nejc (Author)
Gaberšček, Miran (Author)
Files:This document has no files.
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The positive effect of intermetallic ordering of platinum alloy nanoparticles on oxygen reduction reaction (ORR) activity has been well established. What is still missing is an understanding of selective leaching of the less noble metal from the ordered structure and its correlation to longterm ORR performance. Using a combination of kinetic Monte Carlo simulations and advanced characterization techniques, we provide unprecedented insight into dealloying of intermetallic PtCu3 nanoparticles a well-known binary alloy. Comparison of ordered and disordered samples with identical initial compositions and particle size distributions reveals an unexpected correlation: whereas the copper dealloying rates in the ordered and disordered counterparts are almost the same, in the ordered structure Pt atoms are surrounded by 15−30% more Cu atoms throughout all the stages of acid leaching. This more convenient Pt−Cu coordination explains the statistically significant increase of 23−37% in ORR activity of the ordered structure at all stages of alloy degradation.
Keywords:ORR activity, fuel cells, platinum alloy, nanoparticle stability, intermetallic ordering, kinetic Monte Carlo, dealloying, in situ ICP-MS
Number of pages:str. 5530-5534
Numbering:#iss. #8, #Vol. #6
ISSN on article:2155-5435
URN:URN:SI:UNG:REP:HSTI1NAY
DOI:10.1021/acscatal.6b00557 Link is opened in a new window
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Record is a part of a journal

Title:ACS catalysis
Shortened title:ACS catal.
Publisher:American Chemical Society
ISSN:2155-5435
COBISS.SI-ID:518529817 New window

Secondary language

Language:Undetermined
Keywords:materiali, elektrokataliza, nanozlitine, struktura snovi


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