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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

Molecular structure at electrode/electrolyte solution interfaces related to electrocatalysis.

Hidenori Noguchi¹, Tsubasa Okada, Kohei Uosaki

¹Physical Chemistry Laboratory, Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.

Faraday Discussions

|February 14, 2009

Summary

Sum frequency generation (SFG) spectroscopy revealed distinct interfacial water structures on platinum (Pt) and gold (Au) electrodes. Water molecules exhibit more ordered, "ice-like" structures on Pt compared to the disordered, "liquid-like" structures on Au surfaces.

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Area of Science:

Surface science
Electrochemistry
Spectroscopy

Background:

Understanding interfacial water structure is crucial for electrochemical reactions.
Sum frequency generation (SFG) spectroscopy is a powerful technique for probing interfaces.

Purpose of the Study:

To investigate the potential dependence of interfacial water structure on Pt and Au thin film electrodes.
To compare water ordering at Pt and Au surfaces.
To study the influence of electrode potential on interfacial water during methanol oxidation on Pt.

Main Methods:

Sum frequency generation (SFG) spectroscopy in internal reflection mode.
Electrochemical measurements.

Main Results:

Pt electrodes showed distinct peaks corresponding to "ice-like" (3200 cm⁻¹) and "liquid-like" (3400 cm⁻¹) water.
Au electrodes exhibited a dominant peak at 3400 cm⁻¹, indicating more disordered water.
SFG intensity at the Pt electrode was strongly dependent on the applied electrode potential during methanol oxidation.

Conclusions:

Water-electrode interactions differ significantly between Pt and Au surfaces.
Interfacial water structure is sensitive to electrode potential, particularly during electrochemical reactions like methanol oxidation.