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With the drastic growth in the demand for lithium, recovery technologies that remove Li ions from a brine solution are attracting more interest. In this field, capacitive deionization (CDI) has been suggested in various studies because it is energy efficient, economical, and environmentally friendly. These selective processes, however, have not been accompanied by desalination, which is a nonselective process by which salt ions are removed from the brine. In this work, a new-concept system has been designed for the simultaneous desalination and recovery of Li from the brine, in which the two different ion-exchange membranes separate the two electrochemically active spaces of desalination and lithium recovery. It is originally based on the combination of a redox flow battery (RFB) and CDI. The CDI cell has been sandwiched between two electrodes of a RFB, which has been operated and desalinates the brine simultaneously with the charging step of the RFB. In addition, an ion sieve (λ-MnO 2 ) has been utilized in the anolyte tank of the RFB cell, which selectively captures the lithium ions during desalination in CDI and charging in RFB. This combined system has been operated successfully with good desalination performances along with high selectivity in lithium-ion capture.

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In this work, exfoliated WS2 nanosheets were synthesized using a two‐electrode‐configured electrochemical exfoliation method and they were used as a potential material for the detection of NADH. Using screen‐printed carbon electrodes (SPCEs) as a sensing platform, exfoliated WS2 nanostructures (ex‐WS2) were drop‐casted and their electrocatalytic activity was studied in the presence of NADH. The electrochemical impedance spectroscopy (EIS) was applied as a sensing tool to achieve superior sensing performance towards NADH. At the optimized DC bias value of 0.4 V, the developed NADH sensor shows linear calibration plots in the ranges of 2 to 2048 μM. From the calibration data, the sensitivity value was found to be 36.875 Ω log([NADH])−1 with the limit of detection (LOD) value of 57 nM. In addition to that, it also exhibited very high selectivity in the presence of other possible interfering species, suggesting that the present exfoliated WS2‐modified SPCE‐based sensing platform could be used for the impedimetric label‐free monitoring of NADH in various fields.