Xing Siyang, Cheng Yujuan, Yu Fei, Ma Jie
Research Center for Environmental Functional Materials, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, PR China.
J Colloid Interface Sci. 2021 Sep 15;598:511-518. doi: 10.1016/j.jcis.2021.04.051. Epub 2021 Apr 20.
Capacitive deionization (CDI) is considered as a promising desalination technology due to its low energy consumption and no two-second pollution. But the development of traditional CDI is limited by its two drawbacks, which are low deionization capacity and unavoidable parasitic reactions. Hybrid capacitive deionization (HCDI), which is composed of a faradic electrode and an electrical-double-layer electrode, effectively solves the above problem. Herein, we report a typical NASICON material Na(VO)(PO)F and modify it with rGO, then apply it in HCDI firstly and receive a superior desalination performance. Five samples are prepared by adding different contents GO solution and we choose the best one (NVOPF-4) with the lowest resistance for the desalination tests according to electrochemical performance. The result of desalination shows a high desalination capacity of 175.94 mg·g, low energy consumption of 0.35 kWh·kg-NaCl, and the energy recovery is 20% at a current density of 25 mg·g. NVOPF@rGO displays a promising ability for desalination in capacitive deionization, further confirming NASICON be a suitable material type for HCDI electrode materials.
电容去离子化（CDI）因其低能耗和无二次污染而被视为一种很有前景的脱盐技术。但传统CDI的发展受到其两个缺点的限制，即去离子化能力低和不可避免的寄生反应。由法拉第电极和双电层电极组成的混合电容去离子化（HCDI）有效地解决了上述问题。在此，我们报道了一种典型的NASICON材料Na(VO)(PO)F并用rGO对其进行改性，然后首次将其应用于HCDI并获得了优异的脱盐性能。通过添加不同含量的GO溶液制备了五个样品，并根据电化学性能选择电阻最低的最佳样品（NVOPF-4）进行脱盐测试。脱盐结果表明，在电流密度为25 mg·g时，脱盐容量高达175.94 mg·g，能耗低至0.35 kWh·kg-NaCl，能量回收率为20%。NVOPF@rGO在电容去离子化中显示出有前景的脱盐能力，进一步证实了NASICON是HCDI电极材料的合适材料类型。
