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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
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Mechanistic insights into carbon dioxide utilization by superoxide ion generated electrochemically in ionic liquid
Ahmed Halilu1, Maan Hayyan2, Mohamed Kheireddine Aroua3
1Department of Chemical Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia. ryusoff@um.edu.my and University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, Kuala Lumpur 50603, Malaysia. maan_hayyan@yahoo.com.
Physical Chemistry Chemical Physics : PCCP
|December 21, 2020
Summary
This study demonstrates stable generation of superoxide ions (O2˙-) in a specific ionic liquid, enabling efficient CO2 conversion via a nucleophilic addition pathway. This research offers sustainable methods for CO2 utilization using reactive oxygen species.
Area of Science:
- Electrochemistry
- Materials Science
- Chemical Engineering
Background:
- Understanding electrochemical oxygen reduction is key for CO2 conversion.
- Superoxide ion (O2˙-) plays a crucial role in CO2 utilization.
- Ionic liquids offer unique media for electrochemical reactions.
Purpose of the Study:
- To investigate the stable generation of superoxide ions (O2˙-) in butyltrimethylammonium bis(trifluoromethylsulfonyl)imide ([BMAmm+][TFSI-]) ionic liquid.
- To elucidate the mechanism of O2˙- mediated CO2 conversion in this ionic liquid.
- To explore sustainable pathways for CO2 utilization.
Main Methods:
- Cyclic voltammetry (CV) for detecting O2˙- generation and CO2 conversion.
- Electrochemical impedance spectroscopy (EIS) for mechanistic studies.
- Long-term stability analysis of O2˙- in the ionic liquid.
Main Results:
- Stable O2˙- generation was achieved at -0.823 V vs. Ag/AgCl in [BMAmm+][TFSI-].
- O2˙- mediated CO2 conversion via a nucleophilic addition pathway at -0.806 V vs. Ag/AgCl.
- EIS revealed changes in double-layer capacitance during O2˙- generation and CO2 utilization, indicating film formation.
Conclusions:
- Butyltrimethylammonium bis(trifluoromethylsulfonyl)imide ([BMAmm+][TFSI-]) is a suitable ionic liquid for stable O2˙- generation and CO2 conversion.
- The O2˙- mediated CO2 conversion proceeds through a direct nucleophilic addition mechanism.
- This work presents sustainable opportunities for CO2 utilization using reactive oxygen species in ionic liquids.
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