Xi Wen, Jin Jun, Zhang Youfang, Wang Rui, Gong Yansheng, He Beibei, Wang Huanwen
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
Nanoscale. 2022 Aug 25;14(33):11923-11944. doi: 10.1039/d2nr02802f.
2D MXenes have attracted considerable attention due to their high electronic conductivity, tunable metal compositions, functional termination groups, low ion diffusion barriers, and abundant active sites. However, MXenes suffer from sheet stacking and partial surface oxidation, limiting their energy storage and water treatment development. To solve these problems and enhance the performance of MXenes in practical applications, various hierarchical MXene/transition metal oxide (MXene/TMO) heterostructures are rationally designed and constructed. The hierarchical MXene/TMO heterostructures can not only prevent the stacking of MXene sheets and improve the electronic conductivity and buffer the volume change of TMOs during the electrochemical reaction process. The synergistic effect of conductive MXenes and active TMOs also makes MXene/TMO heterostructures promising electrode materials for energy storage and seawater desalination. This review mainly introduces and discusses the recent research progress in MXene/TMO heterostructures, focusing on their synthetic strategies, heterointerface engineering, and applications in rechargeable batteries, capacitors, and capacitive deionization (CDI). Finally, the key challenges and prospects for the future development of the MXene/TMO heterostructures in rechargeable batteries, capacitors, and CDI are proposed.
二维MXenes因其高电子导电性、可调节的金属成分、功能性端基、低离子扩散势垒和丰富的活性位点而备受关注。然而，MXenes存在片层堆叠和部分表面氧化问题，限制了它们在能量存储和水处理方面的发展。为了解决这些问题并提高MXenes在实际应用中的性能，人们合理设计并构建了各种分级MXene/过渡金属氧化物（MXene/TMO）异质结构。分级MXene/TMO异质结构不仅可以防止MXene片层的堆叠，提高电子导电性，并缓冲TMOs在电化学反应过程中的体积变化。导电MXenes和活性TMOs的协同效应也使MXene/TMO异质结构成为有前途的用于能量存储和海水淡化的电极材料。本文综述主要介绍并讨论了MXene/TMO异质结构的最新研究进展，重点关注其合成策略、异质界面工程以及在可充电电池、电容器和电容去离子化（CDI）中的应用。最后，提出了MXene/TMO异质结构在可充电电池、电容器和CDI未来发展中的关键挑战和前景。
