Xiao Zemao, Sun Kaisheng, Zheng Yang, Pang Jianxiang, Gu Tiantian, Kong Wenwen, Chen Long
Xinjiang Production & Construction Corps Key Laboratory of Advanced Energy Storage Materials and Technology and Department of Physics, College of Science, Shihezi University, Shihezi 832003, China.
Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China.
ACS Appl Mater Interfaces. 2023 Oct 25. doi: 10.1021/acsami.3c11395.
MXene is a highly latent capacity electrode material for supercapacitors, but its capacity limits its development. Herein, we have constructed an independently cross-linked three-dimensional (3D) TiCT MXene film (Zn-A-MXene) with a hydroxylation surface through a zinc ion (Zn) and NaOH. The alkalization of NaOH is used to replace the -F functional group that is not conducive to electrochemical reactions and cross-link the MXene nanosheets through the electrostatic interaction of zinc ions. The synergistic effect can greatly improve the effective area of the electrode, the accessibility of the electrolyte, and the specific capacitance. The 3D Zn-A-MXene films exhibit an extremely high capacity (465.1 F g at 1 A g). The all-solid-state flexible supercapacitor assembled using a 3D Zn-A-MXene thin film also has a high energy density of 9.55 Wh kg at a power density of 603.16 W kg. After 5000 cycles, the flexible supercapacitor still has 81.25% of its initial capacity, demonstrating good cycling stability. This work furnishes the innovative idea for constructing high-capacity MXene flexible supercapacitors.
MXene是一种用于超级电容器的具有高潜力的电极材料，但其容量限制了其发展。在此，我们通过锌离子（Zn）和氢氧化钠构建了一种具有羟基化表面的独立交联三维（3D）TiCT MXene薄膜（Zn-A-MXene）。氢氧化钠的碱化作用用于取代不利于电化学反应的-F官能团，并通过锌离子的静电相互作用使MXene纳米片交联。这种协同效应可以极大地提高电极的有效面积、电解质的可及性和比电容。3D Zn-A-MXene薄膜表现出极高的容量（在1 A g时为465.1 F g）。使用3D Zn-A-MXene薄膜组装的全固态柔性超级电容器在功率密度为603.16 W kg时也具有9.55 Wh kg的高能量密度。经过5000次循环后，柔性超级电容器仍具有其初始容量的81.25%，显示出良好的循环稳定性。这项工作为构建高容量MXene柔性超级电容器提供了创新思路。
