School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
J Colloid Interface Sci. 2022 Dec;627:1011-1020. doi: 10.1016/j.jcis.2022.07.111. Epub 2022 Jul 22.
Increasing the salt adsorption capacity (SAC) and durability of electrode materials for hybrid capacitive deionization (HCDI) remain grand challenges. Herein, highly electro-adsorptive and durable vanadium disulfide (VS) electrode material obtained by a surfactant-assisted hydrothermal method is reported. The distinct three-dimensional flower-like architecture and ultrathin thickness of VS nanosheets play a vital role in boosting HCDI performance by exposing a large number of accessible adsorption sites and facilitating the mass transfer of sodium ions. When used in the HCDI system, the flower-like VS electrode delivers a high salt adsorption capacity of 72 mg g in 500 mg L NaCl solution at 1.6 V, outperforming the bulk VS counterpart with a relatively increased thickness of nanosheets. Moreover, after 10 h of cycling test, the SAC of the flower-like VS-based HCDI system remains at 93 % of the initial value, showing excellent operation stability. This surfactant-assisted morphology engineering of VS nanosheets with ultrathin thickness and unique three-dimensional architecture provides new insight into designing layered electrode materials for efficient HCDI.
提高混合电容去离子（HCDI）中电极材料的盐吸附容量（SAC）和耐久性仍然是巨大的挑战。本文报道了一种通过表面活性剂辅助水热法获得的高电吸附性和耐久性的二硫化钒（VS）电极材料。VS 纳米片独特的三维花状结构和超薄厚度在提高 HCDI 性能方面起着至关重要的作用，因为它暴露出大量可及的吸附位点并促进钠离子的质量转移。在 HCDI 系统中使用时，花状 VS 电极在 1.6 V 下于 500 mg L NaCl 溶液中可提供 72 mg g 的高盐吸附容量，优于具有相对较厚纳米片的块状 VS 对应物。此外，经过 10 小时的循环测试后，基于花状 VS 的 HCDI 系统的 SAC 仍保持在初始值的 93%，表现出优异的运行稳定性。这种具有超薄厚度和独特三维结构的 VS 纳米片的表面活性剂辅助形态工程为设计用于高效 HCDI 的层状电极材料提供了新的思路。
