Journal
ELECTROCHIMICA ACTA
Volume 319, Issue -, Pages 264-276Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.126
Keywords
Capacitive cell; Membrane potential; Mixing energy; CO2; Capacitive deionization
Categories
Funding
- Dutch Ministry of Economic Affairs and Ministry of Infrastructure and Environment
- Province of Fryslan
- Northern Netherlands Provinces
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This work demonstrates the possibility to harvest electrical power from CO2 emissions by feeding CO2 and air gas directly into a capacitive cell. Hamelers et al. previously showed, that the available mixing energy of CO2 emitted into the air can be converted into electricity, but at high energy costs for gas-sparging in the process. In the present work, electrical power is generated by feeding the gas directly into the capacitive cell. We investigated three different cell designs (namely, conventional, flowby(wire), and flow-by(flat)), by changing both electrode and cell geometry. The flow-by(flat), inspired from fuel cell design, showed the best performance thanks to a high membrane potential (approximate to 190 mV), which is the highest value so far reported from CO2 and air. A maximum membrane permselectivity between CO2 and air of 90% was obtained, i.e., almost double of values reported in previous studies. On the contrary, the conventional cell design gave poor performance due to non-optimal gas flow in the cell. We highlight the importance of water management and internal electrical resistance, to indicate directions for future developments of the technology. (C) 2019 Elsevier Ltd. All rights reserved.
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