Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Potential Dependent Struc… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Potential Dependent Structural Memory Effects in Au-Pd Nanoalloys

Artikel i vetenskaplig tidskrift
Författare Jakub S Jirkovský
Itai Panas
Simon Romani
Elisabet Ahlberg
David Schiffrin
Publicerad i The Journal of Physical Chemistry Letters
Volym 3
Nummer/häfte 3
Sidor 315–321
ISSN 1948-7185
Publiceringsår 2012
Publicerad vid Institutionen för kemi
Sidor 315–321
Språk en
Länkar dx.doi.org/10.1021/jz201660t
Ämnesord segregation, nanoparticle, ORR, H2O2, bimetallic, alloy, adsorption
Ämneskategorier Kvantkemi, Katalys

Sammanfattning

Alloying of metals offers great opportunities for directing reactivity of catalytic reactions. For nanoalloys, this is critically dependent on near-surface composition, which is determined by the segregation energies of alloy components. Here, Au-Pd surface composition and distribution of Pd within a Au0.7Pd0.3 nanoalloy were investigated by monitoring the electrocatalytic behavior for the oxygen reduction reaction used as a sensitive surface ensemble probe. A time dependent selectivity towards formation of H2O2 as the main oxygen reduction product has been observed, demonstrating that the applied potential history determines surface composition. DFT modeling suggests that these changes can result both from Pd surface diffusion and from exchange of Pd between the shell and the core. Importantly, it is shown that these reorganizations are controlled by surface adsorbate population, which results in a potential dependent Au-Pd surface composition and in remarkable structural memory effects.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?