About: Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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 of the 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 observed breathing behavior is relatively fast and proceeds on a time scale of 100–1000 s. 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 of the 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 observed breathing behavior is relatively fast and proceeds on a time scale of 100–1000 s. (en)
Title	Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption (en)
skos:prefLabel	Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption Surface Stability of Pt3Ni Nanoparticulate Alloy Electrocatalysts in Hydrogen Adsorption (en)
skos:notation	RIV/61388955:_____/13:00394305!RIV14-AV0-61388955
http://linked.open...avai/predkladatel	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...iv/cisloPeriodika	29
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Hoffmannová, Hana Krtil, Petr Petrykin, Valery Okube, Maki
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	109100
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/13:00394305
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	OXYGEN REDUCTION REACTION; SEGREGATION; CATALYSTS (en)
http://linked.open.../riv/klicoveSlovo	CATALYSTS OXYGEN REDUCTION REACTION SEGREGATION
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[8C1CB2DFA141]
http://linked.open...i/riv/nazevZdroje	Langmuir
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	29
http://linked.open...iv/tvurceVysledku	Krtil, Petr Petrykin, Valery Hoffmannová, Hana Jacob, T. Müller, J. E. Okube, Maki
http://linked.open...ain/vavai/riv/wos	000322416700003
issn	0743-7463
number of pages	5 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/la401562t

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