Journal Article

PUBDB-2025-05752

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In Situ X-ray Scattering Studies of the Interface Structure of Liquid Hg–In Electrodes in Aqueous Solution

Hazelnis, J. P.Extern* ; Sartori, A. ; Wu, H.Extern* ; Giri, R. P.Extern* ; Murphy, B.Extern*XFEL.EU*DESY* ; Magnussen, O.Extern* ; Maldonado, S. (Corresponding author)Extern*

2025
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpcc.5c03466

Abstract: The interfacial liquid metal/electrolyte structure for liquid Hg–In alloy electrodes immersed in aqueous sodium tetraborate solution was probed by in situ X-ray reflectivity. X-ray reflectivity data were collected for three different Hg–In alloys that spanned Hg- and In-rich compositions: Hg0.35In0.65, Hg0.50In0.50, and Hg0.95In0.05. The interfaces of these liquid metals with borate electrolyte were studied under potential control between −1.00 and −1.40 V vs E(Ag/AgCl). For all Hg–In alloy compositions, the data suggest Hg surface enrichment at levels inconsistent with predictions from the Gibbs adsorption theorem for an ideal solution. Instead, the surface concentrations of Hg estimated from the fits of the X-ray reflectivity data indicate a large negative enthalpy of mixing in the Hg–In system at all applied potentials. In addition, the reflectivity data as well as scattering measurements at small incident angles suggest a complex atomic arrangement at the surfaces of alloys with high In content, manifesting in increased spacings and microscopic roughness of the topmost atomic layer.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project G:(GEPRIS)541739330 - NSF-DFG MISSION: Operando Untersuchungen von quasi-epitaktischem Wachstum und Elektrokatalyse an flüssigen Galliumelektroden mittels Oberflächenröntgenstreung (541739330) (541739330)
3. FS-Proposal: I-20190235 (I-20190235) (I-20190235)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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