Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F13%3A00394305" target="_blank" >RIV/61388955:_____/13:00394305 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/la401562t" target="_blank" >http://dx.doi.org/10.1021/la401562t</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/la401562t" target="_blank" >10.1021/la401562t</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption

Popis výsledku v původním jazyce

Nanoparticles of Pt/Ni alloys represent state of the art electrocatalysts for fuel cell reactions. Density functional theory (DFT) based calculations along with in situ X-ray absorption spectroscopy (XAS) data show that the surface structure of Pt3Ni nanoparticulate alloys is potential-dependent during electrocatalytic reactions. Pt3Ni based electrocatalysts demonstrate preferential confinement of Ni to the subsurface when the electrode is polarized in the double layer region where the surface is free of specifically adsorbed species. Hydrogen adsorption triggers nickel segregation to the surface. This process is facilitated by a high local surface coverage of adsorbed hydrogen in the vicinity of the surface confined Ni due to an uneven distribution ofthe adsorbate(s) on the catalyst?s surface. The adsorption triggered surface segregation shows a non-monotonous dependence on the electrode potential and can be identified as a breathing of the catalyst as was proposed previously. The ob

Název v anglickém jazyce

Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption

Popis výsledku anglicky

Nanoparticles of Pt/Ni alloys represent state of the art electrocatalysts for fuel cell reactions. Density functional theory (DFT) based calculations along with in situ X-ray absorption spectroscopy (XAS) data show that the surface structure of Pt3Ni nanoparticulate alloys is potential-dependent during electrocatalytic reactions. Pt3Ni based electrocatalysts demonstrate preferential confinement of Ni to the subsurface when the electrode is polarized in the double layer region where the surface is free of specifically adsorbed species. Hydrogen adsorption triggers nickel segregation to the surface. This process is facilitated by a high local surface coverage of adsorbed hydrogen in the vicinity of the surface confined Ni due to an uneven distribution ofthe adsorbate(s) on the catalyst?s surface. The adsorption triggered surface segregation shows a non-monotonous dependence on the electrode potential and can be identified as a breathing of the catalyst as was proposed previously. The ob

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Langmuir

ISSN

0743-7463

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

29

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

9046-9050

Kód UT WoS článku

000322416700003

EID výsledku v databázi Scopus

—