Deakin University
Browse

File(s) under permanent embargo

Structure of the electrical double layer at aqueous gold and silver interfaces for saline solutions

Version 2 2024-06-03, 17:41
Version 1 2015-01-16, 15:06
journal contribution
posted on 2024-06-03, 17:41 authored by ZE Hughes, Tiffany WalshTiffany Walsh
We report the structure of the electrical double layer, determined from molecular dynamics simulations, for a range of saline solutions (NaCl, KCl, MgCl2 and CaCl2) at both 0.16 and 0.60 mol kg(-1) on different facets of the gold and silver aqueous interfaces. We consider the Au/Ag(111), native Au/Ag(100) and reconstructed Au(100)(5×1) facets. For a given combination of metallic surface and facet, some variations in density profile are apparent across the different cations in solution, with the corresponding chloride counterion profiles remaining broadly invariant. All density profiles at the higher concentration are predicted to be very similar to their low-concentration counterparts. We find that each electrolyte responds differently to the different metallic surface and facets, particularly those of the divalent metal ions. Our findings reveal marked differences in density profiles between facets for a given metallic interface for both Mg(2+) and Ca(2+), with Na(+) and K(+) showing much less distinction. Mg(2+) was the only ion for which we find evidence of materials-dependent differences in interfacial solution structuring between the Ag and Au.

History

Journal

Journal of colloid and interface science

Volume

436

Pagination

99-110

Location

Maryland Heights, MO

ISSN

0021-9797

eISSN

1095-7103

Language

eng

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2014, Elsevier

Publisher

Academic Press (Elsevier)