While many Na +‐capture electrodes have been investigated, only a few Cl −‐capture materials are available in aqueous media, which hinders the further improvement for electrochemical desalination. ] This has enabled CDI to allow for direct seawater desalination and added additional features, such as ion selectivity. ] Over the last years, there has been a clear transition from first‐generation CDI by the use of ion electrosorption and nanoporous carbon toward second‐generation CDI based on charge‐transfer materials and processes. In this context, capacitive deionization (CDI) is widely considered a promising desalination technology, especially for brackish water, due to its high energy efficiency and easy generation compared with those of traditional desalination technology. Hence, developing facile, feasible, and highly efficient energy utilization technology is beneficial for applications to desalinate seawater. However, their considerable energy consumption, pollution, and high cost have limited their large‐scale application. ] are considered effective techniques for removing NaCl from seawater. For instance, chloride ions account for 55% of the total salinity, and the removal of Cl − is a vital task to decrease the total salinity of seawater. ] Considering the abundance of seawater on Earth, it is important to remove NaCl, which is a great component of brine, to generate fresh water. The growing world population, which has been accompanied by a rapid expansion of industry and increased development in agriculture, has led to the need for an increasing amount of fresh water for human beings to make progress. This work provides fundamental insight into the coupling of battery and pseudocapacitive behaviors during Cl − capture for electrochemical desalination. The Ti 3C 2T x/Ag system exhibits fast rate capability, high desalination capacity, low energy consumption, and excellent cyclability, which can be ascribed to the synergistic effect between the battery and pseudocapacitive behaviors of the Ti 3C 2T x/Ag hybrid material. Furthermore, low energy consumption of 0.42 kWh kg −1 Cl − and a desalination rate of 1.5 mg Cl − g −1 min −1 at 50 mA g −1 is achieved. Herein, the Ti 3C 2T x/Ag electrode with a reaction time of 3 h exhibits excellent desalination performance with a capacity of 135 mg Cl − g −1 at 20 mA g −1 in a 10 × 10 −3 m NaCl solution. ![]() Ti 3C 2T x/Ag samples with a low charge transfer resistance exhibit both pseudocapacitive and battery behaviors. All Ti 3C 2T x/Ag samples are hydrophilic, which is beneficial for water desalination. Silver nanoparticles are formed successfully and uniformly distributed with the layered‐structure of Ti 3C 2T x. This work introduces Ti 3C 2T x/Ag synthesized via a facile oxidation‐reduction method and then uses it as an anode for chloride‐ion capture in CDI. The recent advances in chloride‐ion capturing electrodes for capacitive deionization (CDI) are limited by the capacity, rate, and stability of desalination.
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