Ultrafine Ag/AgCl heterostructures confined in the MXene nanosheets for enhanced chloride ion storage

作者：Haolin Li, Bohan Liu, Feifei Pang, Xingtao Xu, Zhichang Xiao, Ningzhao Shang, Xiaoxian Zhao, Jungmok You, Yusuke Yamauchi, Shuaihua Zhang · 发表于：Nano Energy · 年份：2025 · DOI：10.1016/j.nanoen.2025.111135 · 被引用次数：6 · 研究领域：MXene and MAX Phase Materials、Advancements in Battery Materials、Supercapacitor Materials and Fabrication

Silver-based materials are recognized as highly efficient electrodes for chloride ion storage in capacitive deionization (CDI), owing to their superior theoretical capacity and exceptional selectivity for Cl⁻ ions. However, their chloride ion capture capacity and cycling stability are significantly limited by volume expansions during the ion capturing process. Herein, the silver/silver chloride/MXene (Ag/AgCl/Ti 3 C 2 T x ) was successfully synthesized using a combination of a Lewis acidic etching and a redox replacement strategy. The highly-dispersed Ag/AgCl heterostructures are confined within the MXene nanosheets, which improves the structural stabilities of both Ag and MXenes, and further promotes chloride ion capture capacity and long-term cycling stability. Benefiting from these superiorities, the Ag/AgCl/Ti 3 C 2 T x as a promising CDI anode achieves large Cl - capturing capacity (156.4 mg g -1 at 1.2 V; and 218.5 mg g -1 at 1.6 V), low energy consumption (0.58 W h g -1 ), and impressive cycling performance (90.8% retention after 120 cycles). Furthermore, the possible Cl - capturing mechanisms involved were elaborated by the systematical characterizations, density functional theory calculations and finite element simulations. This study provides inspirations for the design and construction of high-performance CDI electrodes for chloride ion capture technologies.