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Updated: Aug 10, 2025
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
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Cation Effects on Interfacial Water Structure and Hydrogen Peroxide Reduction on Pt(111)
Valentín Briega-Martos1, Francisco J Sarabia1, Víctor Climent1
1Instituto de Electroquímica, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
ACS Measurement Science Au
|February 14, 2023
Summary
The cation in aqueous electrolytes significantly alters interfacial water structure and electrocatalytic activity on platinum surfaces. This effect is linked to changes in water adlayer structure and charge accumulation.
Area of Science:
- Electrochemistry
- Surface Science
- Physical Chemistry
Background:
- The structure of water at electrode-electrolyte interfaces is crucial for electrochemical reactions.
- Alkali metal cations in electrolytes can influence interfacial properties.
- Understanding these influences is key to designing efficient electrocatalysts.
Purpose of the Study:
- To investigate the effect of different alkali metal cations (Li+, Na+, Cs+) on the Pt(111) electrode-electrolyte interface.
- To study the impact of interfacial water structure on the hydrogen peroxide reduction reaction.
- To correlate interfacial water structure with electrocatalytic activity.
Main Methods:
- Cyclic voltammetry to probe interfacial properties and reaction kinetics.
- Laser-induced temperature jump experiments to analyze interfacial water dynamics.
- Electrochemical measurements under varying electrolyte compositions.
Main Results:
- The potential of maximum entropy (pme) varies with alkali metal cation, following the order Li+ < Na+ < Cs+.
- The hydrogen peroxide reduction reaction is inhibited at low potentials due to negative charge buildup.
- The potential of inhibition (Einhibition) correlates with the pme trend, indicating cation-dependent interfacial effects.
Conclusions:
- Electrolyte cation nature profoundly affects interfacial water structure at the Pt(111) electrode.
- Interfacial water adlayer structure plays a significant role in electrocatalytic reaction activity.
- Modulating interfacial water structure via cation choice offers a pathway to control electrocatalysis.
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