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Updated: Jun 15, 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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Three-Way Control on Product Selectivity in Electrocatalytic CO2 Reduction Reaction Using a Single Molecular Co-NHC
Sanajit Kumar Mandal1, Joyanta Choudhury1
1Organometallics & Smart Materials Laboratory, Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, India.
Inorganic Chemistry
|August 23, 2024
Summary
This study introduces a single organometallic cobalt electrocatalyst (Co-U) for selective carbon dioxide reduction. By adjusting reaction conditions, it efficiently produces carbon monoxide, hydrogen, or formic acid, addressing a key challenge in CO2 utilization.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Molecular electrocatalysts are crucial for converting CO2 into valuable products like CO, H2, and formic acid.
- Achieving high selectivity for specific products remains a significant challenge in CO2 electroreduction.
- Developing single catalysts that can be tuned for different product selectivities is highly desirable.
Purpose of the Study:
- To present a novel organometallic cobalt electrocatalyst, Co-U.
- To demonstrate the catalyst's ability to selectively produce CO, H2, and HCO2H via electrochemical CO2 reduction (CO2RR).
- To investigate how reaction conditions, including proton sources and additives, influence product selectivity.
Main Methods:
- Electrochemical CO2 reduction reaction (CO2RR) using the Co-U catalyst.
- Systematic variation of proton sources (H2O, trifluoroethanol) and additives (triethylamine, morpholine).
- Faradaic efficiency (FE) measurements to quantify product selectivity.
Main Results:
- Selective CO production with 81 ± 2% FE using 5% H2O.
- Selective H2 production with 80 ± 3% FE using 1.5 M triethylamine and 10% H2O.
- Predominant HCO2H production (55 ± 5% FE) using 1.0 M morpholine and 10% trifluoroethanol, with H2 as a byproduct.
Conclusions:
- The Co-U electrocatalyst demonstrates tunable selectivity for CO2RR.
- Product selectivity is effectively controlled by the interplay between the catalyst, proton source, and additives.
- This work offers a promising strategy for single-catalyst systems in CO2 utilization.
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