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Related Experiment Video

Updated: Apr 26, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Water at interfaces.

Hirokazu Takahashi¹, Akiyoshi Kuzume², Masatoki Ito³

¹Department of Chemistry, Faculty of Science and Engineering, Keio University, Yokohama 223-8522, Japan. takahashi@sepia.chem.keio.ac.jp

Journal of Environmental Sciences (China)

|August 2, 2014

Summary

Electrolyte anions break hydrogen bonds, while cations do not. Electrode potential influences water molecule ordering and dissociation at electrified interfaces, impacting electrochemical reactions.

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Published on: September 9, 2022

Area of Science:

Electrochemistry
Physical Chemistry
Materials Science

Background:

Electrolytes play a crucial role in aqueous solutions, influencing hydrogen bonding and interfacial phenomena.
Understanding the behavior of water molecules at electrode surfaces is key to controlling electrochemical reactions.

Purpose of the Study:

To investigate the hydrogen bond breaking capabilities of electrolyte cations and anions.
To explore the effect of electrode potential on water molecule structure and dissociation at electrified interfaces.
To elucidate the mechanism of Mg(OH)2 formation via electro-reduction on a gold electrode.

Main Methods:

Electrochemical experiments were conducted using a gold electrode in aqueous electrolyte solutions.
Electrode potential was systematically varied to study interfacial water structure and electrochemical reactions.
Spectroscopic or microscopic techniques may have been employed to analyze the electrode surface and water structure (details not provided in abstract).

Main Results:

Anions were identified as strong hydrogen bond breakers in aqueous solutions, whereas cations exhibited weaker effects.
Electro-reduction of Mg(H2O)6(2+) to Mg(OH)2 was observed on the gold electrode surface at negative potentials.
Water molecules in the electric double layer showed ordered structures at negative potentials and disordered structures at the point of zero charge (pzc).

Conclusions:

Electrode potential polarization significantly alters the ordering, orientation, and charge transfer of water molecules at electrified interfaces.
Applied potentials can control water molecule dissociation and influence electrochemical processes like Mg(OH)2 formation.
The findings provide insights into the fundamental mechanisms governing electrochemical reactions at interfaces.