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Naslov:Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalyst
Avtorji:Pavlišič, Andraž (Avtor)
Jovanovič, Primož (Avtor)
Šelih, Vid Simon (Avtor)
Šala, Martin (Avtor)
Bele, Marjan (Avtor)
Dražić, Goran (Avtor)
Arčon, Iztok (Avtor)
Hočevar, Samo B. (Avtor)
Kokalj, Anton (Avtor)
Hodnik, Nejc (Avtor)
Gaberšček, Miran (Avtor)
Datoteke:Gradivo nima datotek.
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis: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.
Ključne besede:ORR activity, fuel cells, platinum alloy, nanoparticle stability, intermetallic ordering, kinetic Monte Carlo, dealloying, in situ ICP-MS
Št. strani:str. 5530-5534
Številčenje:#iss. #8, #Vol. #6
ISSN pri članku:2155-5435
URN:URN:SI:UNG:REP:HSTI1NAY
DOI:10.1021/acscatal.6b00557 Povezava se odpre v novem oknu
Število ogledov:1706
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Gradivo ni uvrščeno v področja.
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.

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Gradivo je del revije

Naslov:ACS catalysis
Skrajšan naslov:ACS catal.
Založnik:American Chemical Society
ISSN:2155-5435
COBISS.SI-ID:518529817 Novo okno

Sekundarni jezik

Jezik:Ni določen
Ključne besede:materiali, elektrokataliza, nanozlitine, struktura snovi


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