Oxygen‐Assisted Supercapacitive Swing Adsorption of Carbon Dioxide
[1]
- Department of Chemistry Lehigh University 6 East Packer Avenue Bethlehem PA 18015 USA
- Department of Chemical and Bioengineering Lehigh University 5 East Packer Avenue Bethlehem PA 18015 USA
- Department of Chemical and Bioengineering Lehigh University 5 East Packer Avenue Bethlehem PA 18015 USA, Department of Chemical Sciences and Bernal Institute University of Limerick Limerick V94 T9PX Ireland
Abstract We report on the supercapacitive swing adsorption (SSA) of carbon dioxide at different voltage windows in the presence of oxygen using activated carbon electrodes, and deliquescent, aqueous electrolytes. The presence of O 2 in the CO 2 /N 2 gas mixture results in an up to 11 times higher CO 2 adsorption capacity with 3 M MgBr 2 (at 0.6 V) and up to 4–5 times higher adsorption capacity with 3 M MgCl 2 (at 1 V). A tradeoff between high CO 2 adsorption capacities and lower coulombic efficiencies was observed at voltages above 0.6 V. The energetic and adsorptive performance of the electrodes in the presence of oxygen below 0.5 V was similar to the performance with a CO 2 /N 2 mixture without oxygen at 1 V. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) of the electrodes demonstrate that the specific capacitance increases while the diffusion resistance decreases in the presence of oxygen. Oxygen concentrations ranging between 5–20 % give similar energetic and adsorptive performance. The electrodes exhibit stable performance for up to 100 cycles of operation.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- NONE; SC0012577
- OSTI ID:
- 2437825
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition); ISSN 1433-7851
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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