Nickel hexacyanoferrate electrodes for high mono/divalent ion-selectivity in capacitive deionization

Electrochemical carbon dioxide capture to close the carbon cycle

“…Another electrochemical based CO 2 capture concept utilizing local pH near electrodes is the (membrane) capacitive deionization (MCDI) method [37,156]. Capacitive deionization is mainly used for water treatment, but its application has recently expanded to energy harvesting and CO 2 capture [157][158][159][160][161][162][163][164][165]. The motivation to capture CO 2 via such system is that deionized water can be used without the need of any other chemicals, using inexpensive carbon based electrodes [37,156].…”

Recent advances in ion selectivity with capacitive deionization

“…Review preferential adsorption of monovalent Na + over divalent Ca 2+ and Mg 2+ ions from a mixture containing all three ions. 103 The authors reported a r of 20 and 25 for Na + over Ca 2+ and Mg 2+ , respectively and claimed that the selectivity towards Na + remained largely independent of its concentration in the mixture. These r values are especially remarkable since the intercalation potential of Na + is very close to that of Ca 2+ and Mg 2+ , as shown in Fig.…”

Graphene–carbon 2D heterostructures with hierarchically-porous P,N-doped layered architecture for capacitive deionization

“…In this regard, capacitive deionization (CDI), an advanced electrochemical deionization technology, has emerged as a competitive methodology for the desalination of brackish water and seawater, due to its several important advantages including low energy consumption, cost effectiveness, and environmental benignity. [5][6][7][8][9] The working principle of CDI is similar to that of electric double layer (EDL) capacitors, 10 where the application of a low directional current causes charged ions to approach the oppositely charged electrode, with their subsequent adsorption at internal pores by formation of EDLs. This process eventually provides puried water with extracted ions being continuously stored within the electrode materials.…”