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Updated: Jul 26, 2025
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
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Potential-Dependent Temporal Dynamics of CO Surface Concentration in Electrocatalytic CO2 Reduction
Padmanabh B Joshi1, Andrew J Wilson1
1Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States.
The Journal of Physical Chemistry Letters
|June 15, 2023
Summary
Pulsed-potential electrochemical Raman scattering microscopy reveals how carbon monoxide (CO) concentration changes over time on silver electrodes during CO2 reduction. This method offers faster measurements of intermediate temporal evolution.
Area of Science:
- Electrochemistry
- Surface Science
- Spectroscopy
Background:
- Understanding intermediate concentration dynamics is crucial for optimizing electrochemical reactions.
- Carbon dioxide (CO2) reduction is a key area for sustainable energy technologies.
Purpose of the Study:
- To measure the potential-dependent temporal evolution of carbon monoxide (CO) intermediates during electrocatalytic CO2 reduction.
- To investigate the influence of electrode potential on CO surface accumulation and residence time.
Main Methods:
- Application of pulsed-potential electrochemical Raman scattering microscopy.
- Electrocatalytic CO2 reduction on silver (Ag) electrodes in acetonitrile.
- Measurement of CO surface concentration changes over time at various applied potentials.
Main Results:
- CO accumulates on Ag electrode surfaces at longer than 1 s at potentials positive of the onset potential.
- Near the ensemble onset potential, CO resides on the surface for approximately 100 ms.
- At potentials promoting CO evolution, adsorbed CO persists for less than 10 ms.
Conclusions:
- Pulsed-potential electrochemical Raman scattering microscopy enables measurements of intermediate temporal evolution at unprecedented speeds.
- The study provides direct insights into the dynamic behavior of CO intermediates, critical for improving CO2 electrocatalytic reduction.
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