Lee Pin-Yan, Cheng Tsai-Mu, Yougbaré Sibidou, Lin Lu-Yin
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan.
Graduate Institute for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei 11031, Taiwan; Taipei Heart Institute, Taipei Medical University, Taipei 11031, Taiwan.
J Colloid Interface Sci. 2022 Jul 15;618:219-228. doi: 10.1016/j.jcis.2022.03.092. Epub 2022 Mar 23.
High surface area and tunable pore size are beneficial for metal organic frameworks (MOFs) as electroactive material of energy storage devices. Novel ZIF67 derivative proposed in our previous work, nickel cobalt fluoride coupled with ammonia ions (NCNF), is synthesized using ammonia fluoride to solve poor electrical conductivity of MOFs. MXene is commonly incorporated in pseudo-capacitive materials to enhance electrical conductivity and energy storage ability. In this study, it is the first time to design MXene and NCNF composites (MXene/NCNF) with different MXene amounts via incorporating MXene in growing process of NCNF. MXene and NCNF are combined via self-assembly in a simple room temperature solution process. The optimized MXene/NCNF electrode shows a higher specific capacitance of 1020.0 F g (170.0 mAh g) than that of NCNF electrode (574.2 F g and 95.7 mAh g) at 20 mV s, due to excellent surface properties of MXene/NCNF with conductive network of MXene and high electrocapacitive performance of NCNF. A symmetric energy storage device composed of the optimized MXene/NCNF electrodes presents outstanding cycling stability with Coulombic efficiency of 100% during whole cycling process and a high capacitance retention of 99% after 6000 cycles. Excellent electrochemical performance and simple synthesis of MXene/NCNF open new blueprints for designing novel electrocapacitive materials for electrochemical applications.
高比表面积和可调节的孔径对作为储能装置电活性材料的金属有机框架（MOF）有益。我们之前的工作中提出的新型ZIF67衍生物，即镍钴氟化物与铵离子耦合（NCNF），是使用氟化铵合成的，以解决MOF导电性差的问题。MXene通常被掺入赝电容材料中以提高导电性和储能能力。在本研究中，首次通过在NCNF的生长过程中掺入MXene来设计不同MXene含量的MXene与NCNF复合材料（MXene/NCNF）。MXene和NCNF在简单的室温溶液过程中通过自组装结合。优化后的MXene/NCNF电极在20 mV s时显示出比NCNF电极（574.2 F g和95.7 mAh g）更高的比电容1020.0 F g（170.0 mAh g），这归因于MXene/NCNF具有MXene导电网络的优异表面性能以及NCNF的高电电容性能。由优化后的MXene/NCNF电极组成的对称储能装置具有出色的循环稳定性，在整个循环过程中库仑效率为100%，在6000次循环后电容保持率高达99%。MXene/NCNF优异的电化学性能和简单的合成方法为设计用于电化学应用的新型电电容材料开辟了新的蓝图。
