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Oxygen-assisted supercapacitive swing adsorption of carbon dioxide
Date
2024
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 O2 in the CO2/N2 gas mixture results in an up to 11 times higher CO2 adsorption capacity with 3 M MgBr2 (at 0.6 V) and up to 4–5 times higher adsorption capacity with 3 M MgCl2 (at 1 V). A tradeoff between high CO2 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 CO2/N2 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.
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Description
Publisher
Wiley and Sons Ltd
Citation
Angewandte Chemie International Edition, 2024, 63 (39) e202404881
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Funding Information
We thank Paul Milenkowic from KV farms for supplying the garlic roots, and gratefully acknowledge Lehigh University for funding the O2 analyzer via FRG grant FRGAWD180. Dr. Guido Pez is gratefully acknowledged for supporting the main body of the research through financial donations. The Raman spectroscopy studies were supported as part of the Center for Understanding and Controlling Accelerated and Gradual Evolution of Materials for Energy (UNCAGE ME), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under the award No.DE-SC0012577.