<div class="csl-bib-body">
<div class="csl-entry">Olgiati, M., Tang, Z., Arvelo, D., Garcia, R., & Valtiner, M. (2025, May 28). <i>Resolving the double layer and hydration structure of competing ions at solid-liquid interfaces</i> [Conference Presentation]. 10th Multifrequency AFM Conference, Madrid, Spain. http://hdl.handle.net/20.500.12708/225846</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/225846
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dc.description.abstract
Resolving the double layer and hydration structure of competing ions at
solid-liquid interfaces
M. Olgiati,1 D. M. Arvelo,2 R. Garcia,2 M. Valtiner1
1TU Wien, Institute of Applied Physics, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria
2Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain
In the framework of clean energy technologies, electrochemical production of hydrogen from
water and conversion of CO2 into valuable green fuels are of great interest, despite their
kinetic and thermodynamic limitations. Overcoming these limitations requires an accurate
molecular-level description of the transition states taking place at the solid-liquid interface.
The chemistry of the supporting electrolyte was shown to affect the activities of catalytic
reactions [1]. The weakly-hydrated cations, for example, seem to act as proton donors through
water hydrolysis, which can alter the proton availability (i.e., kinetics) of HER [2] or buffer
the interfacial pH to an ideal value for CO2 reduction in acidic media [3].
More recently, the effects of additions of organic cations derived from quaternary ammonium
salts has been investigated [4]. For example, the size of the quaternary ammonium salt was
found to provide selectivity towards CO2 reduction intermediates [5], thus affecting the
reaction pathways. Additions of tetrabutylammonium ions to alkaline electrolytes were also
shown to controversially promote the HER despite its physisorption and site-blocking effect
[6].
This opens the question on how the organic ions are structuring and/or competing with (for
example) alkali ions within the electric double layer under high surface charging regime. For
this purpose, we investigate the structure of electric double layers consisting of ionic mixtures
on the surface of muscovite mica. The mixtures consist of alkali ions (namely, Cs+) and
quaternary ammonium salts with different hydrophobic character [tetraethylammonium
(TEA+) or tetrabutylammonium (TBA+)]. Competition between the ions is investigated with
high resolution AFM imaging and force spectroscopy, while the interfacial hydration structure
is more deeply investigated with three-dimensional AFM (3D-AFM). Such understanding
provides insights for tuning and optimizing the chemistry of electrocatalytic solutions.
References:
[1] D. Strmcnik et al., Nature Chemistry 1, 466-472 (2009)
[2] X. Liu et al., Electrochimica Acta 507, 145068 (2024)
[3] X. Liu et al., J. Am. Chem. Soc. 146, 5242-5251 (2024)
[4] I. Ledezma-Yanez et al., ChemElectroChem 2, 1612-1622 (2015)
[5] C. Deacon-Price et al., ACS Catal. 14, 12928-12939 (2024)
[6] J. Fernandez-Vidal et al., ACS Catal. 14, 8130-8137 (2024)
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dc.language.iso
en
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dc.subject
Solid-liquid interfaces
en
dc.subject
Atomic Force Microscopy
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dc.subject
force probing
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dc.subject
Adsorption
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dc.subject
Electrochemistry
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dc.title
Resolving the double layer and hydration structure of competing ions at solid-liquid interfaces
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dc.type
Presentation
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dc.type
Vortrag
de
dc.contributor.affiliation
Instituto de Ciencia de Materiales de Madrid, Spain
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dc.contributor.affiliation
Instituto de Ciencia de Materiales de Madrid, Spain
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dc.contributor.affiliation
Instituto de Ciencia de Materiales de Madrid, Spain
