In Situ Study of Nanoporosity Evolution during Dealloying AgAu and CoPd by Grazing-Incidence Small-Angle X-ray Scattering

Markus Gößler, Elisabeth Hengge, Marco Bogar, Mihaela Albu, Daniel Knez, Heinz Amenitsch*, Roland Würschum*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Electrochemical dealloying has become a standard technique to produce nanoporous network structures of various noble metals, exploiting the selective dissolution of one component from an alloy. While achieving nanoporosity during dealloying has been intensively studied for the prime example of nanoporous Au from a AgAu alloy, dealloying from other noble-metal alloys has been rarely investigated in the scientific literature. Here, we study the evolution of nanoporosity in the electrochemical dealloying process for both CoPd and AgAu alloys using a combination of in situ grazing-incidence small-angle X-ray scattering (GISAXS), kinetic Monte Carlo (KMC) simulations, and scanning transmission electron microscopy (STEM). When comparing dealloying kinetics, we find a more rapid progression of the dealloying front for CoPd and also a considerably slower coarsening of the nanoporous structure for Pd in relation to Au. We argue that our findings are natural consequences of the effectively higher dealloying potential and the higher interatomic binding energy for the CoPd alloy. Our results corroborate the understanding of electrochemical dealloying on the basis of two rate equations for dissolution and surface diffusion and suggest the general applicability of this dealloying mechanism to binary alloys. The present study contributes to the future tailoring of structural size in nanoporous metals for improved chemical surface activity.

Originalspracheenglisch
Seiten (von - bis)4037–4047
Seitenumfang11
FachzeitschriftThe Journal of Physical Chemistry C
Jahrgang126
Ausgabenummer8
DOIs
PublikationsstatusVeröffentlicht - 3 Mär 2022

ASJC Scopus subject areas

  • Elektronische, optische und magnetische Materialien
  • Energie (insg.)
  • Oberflächen, Beschichtungen und Folien
  • Physikalische und Theoretische Chemie

Fields of Expertise

  • Advanced Materials Science

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