Xu Huiting, Li Meng, Gong Siqi, Zhao Fan, Zhao Yang, Li Chunli, Qi Junjie, Wang Zhiying, Wang Honghai, Fan Xiaobin, Peng Wenchao, Liu Jiapeng
School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.
School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China.
J Colloid Interface Sci. 2022 Oct 15;624:233-241. doi: 10.1016/j.jcis.2022.05.131. Epub 2022 May 25.
Capacitive deionization has attracted wide concern on accountof its high energy efficiency, low manufacturing cost and environmental friendliness. Nevertheless, the development of capacitive deionization is still impeded because of the scarcity of suitable electrode materials with superior performance. Herein, we successfully prepared the two-dimensional (2D) titanium carbide (TiCT) MXene/ reduced graphene oxide (rGO) superlattice heterostructure by a facile electrostatic self-assembly strategy and systematically investigated its performance as capacitive deionized electrode materials. The unique 2D/2D superlattice heterostructure not only effectively alleviates the self-stacking problem of TiCT MXene nanosheets, but also endows the heterostructure with superior conductivity and fast ion diffusion rate. As a result, the MXene/rGO superlattice heterostructure exhibits an outstanding salt (Na) adsorption capacity (48 mg g) at 1.2 V significantly superior to pristine TiCT MXene nanosheets, along with outstanding long-term cycling performance. Furthermore, the mechanism involved was elucidated through comprehensive characterizations. Therefore, this study offers a new pathway for designing high-performance electrode materials for capacitive deionization.
电容去离子因其高能效、低制造成本和环境友好性而受到广泛关注。然而，由于缺乏具有优异性能的合适电极材料，电容去离子的发展仍然受到阻碍。在此，我们通过简便的静电自组装策略成功制备了二维（2D）碳化钛（TiCT）MXene/还原氧化石墨烯（rGO）超晶格异质结构，并系统地研究了其作为电容去离子电极材料的性能。独特的2D/2D超晶格异质结构不仅有效地缓解了TiCT MXene纳米片的自堆叠问题，还赋予了异质结构优异的导电性和快速的离子扩散速率。结果，MXene/rGO超晶格异质结构在1.2 V时表现出出色的盐（Na）吸附容量（48 mg g），明显优于原始的TiCT MXene纳米片，同时具有出色的长期循环性能。此外，通过综合表征阐明了其中涉及的机制。因此，本研究为设计用于电容去离子的高性能电极材料提供了一条新途径。
