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Updated: Oct 7, 2025
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.5K
Transient Effects Caused by Gas Depletion during Carbon Dioxide Electroreduction
Álvaro Moreno Soto1, Jack R Lake1, Kripa K Varanasi1
1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 11, 2022
Summary
Carbon dioxide (CO2) electroreduction for clean fuels is hindered by CO2 depletion near electrodes. This study models CO2 depletion and pH changes, suggesting pH as a CO2 concentration metric to improve CO2RR efficiency.
Area of Science:
- Electrochemistry
- Renewable Energy
- Catalysis
Background:
- Carbon dioxide (CO2) electroreduction offers a pathway to sustainable fuels and chemicals.
- CO2 concentration near the electrode surface decreases during the reaction, impacting efficiency.
- Hydrogen (H2) generation can become favored over CO2 reduction as CO2 is depleted.
Purpose of the Study:
- To develop a model for understanding aqueous gas depletion during CO2 electroreduction.
- To investigate the influence of CO2 depletion on long-term CO2 electroreduction efficiency.
- To explore the relationship between pH evolution and CO2 concentration at the electrode surface.
Main Methods:
- Modeling of aqueous gas depletion dynamics over time.
- Analysis of pH changes near the electrode surface, considering CO2 consumption and ion generation.
- Evaluation of CO2 electroreduction reaction (CO2RR) efficiency using H2 generation as a metric.
Main Results:
- CO2 depletion significantly reduces electrochemical reaction efficiency.
- pH changes near the electrode surface can serve as an indirect measure of local CO2 concentration.
- The model accounts for time-dependent gas depletion and its impact on CO2RR.
Conclusions:
- CO2 depletion is a critical factor limiting the efficiency of CO2 electroreduction.
- pH monitoring offers a viable method for assessing CO2 concentration in situ.
- Strategies like pulsed electroreduction can mitigate efficiency losses due to gas depletion.
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