Li Shengzhao, Wang Yingyi, Li Yue, Xu Jiaqiang, Li Tie, Zhang Ting
NEST Lab, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.
i-Lab, Nano-X Vacuum Interconnected Workstation, Key Laboratory of Multifunction Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), 398 Ruoshui Road, Suzhou 215123, China.
Nanomaterials (Basel). 2023 Feb 3;13(3):610. doi: 10.3390/nano13030610.
For the energy supply of smart and portable equipment, high performance supercapacitor electrode materials are drawing more and more concerns. Conductive Ni-MOF is a class of materials with higher conductivity compared with traditional MOFs, but it continues to lack stability. Specifically, MXene (TiCT) has been employed as an electrochemical substrate for its high mechanical stability and abundant active sites, which can be combined with MOFs to improve its electrochemical performance. In this paper, a novel Ni-MOF nanorods array/TiCT nanocomposite was prepared via a facile hydrothermal reaction, which makes good use of the advantages of conductive Ni-MOF and high strength TiCT. The high density forest-like Ni-MOF array in situ grown on the surface of TiCT can provide abundant active electrochemical sites and construct a pathway for effective ion transport. The formation of a "Ti-O···Ni" bond accomplished during an in situ growth reaction endows the strong interfacial interaction between Ni-MOF and TiCT. As a result, the Ni-MOF/TiCT nanocomposite can achieve a high specific capacitance of 497.6 F·g at 0.5 A·g and remain over 66% of the initial capacitance when the current density increases five times. In addition, the influence of the TiCT concentration and reaction time on the morphology and performance of the resultant products were also investigated, leading to a good understanding of the formation process of the nanocomposite and the electrochemical mechanism for a supercapacitive reaction.
对于智能便携设备的能量供应，高性能超级电容器电极材料越来越受到关注。导电镍基金属有机框架材料（Ni-MOF）是一类与传统金属有机框架材料相比具有更高导电性的材料，但它仍然缺乏稳定性。具体而言，MXene（TiCT）因其高机械稳定性和丰富的活性位点而被用作电化学基底，它可以与金属有机框架材料结合以改善其电化学性能。本文通过简便的水热反应制备了一种新型的Ni-MOF纳米棒阵列/TiCT纳米复合材料，该复合材料充分利用了导电Ni-MOF和高强度TiCT的优势。原位生长在TiCT表面的高密度森林状Ni-MOF阵列可以提供丰富的电化学活性位点，并构建有效的离子传输通道。原位生长反应过程中形成的“Ti-O···Ni”键赋予了Ni-MOF与TiCT之间强大的界面相互作用。因此，Ni-MOF/TiCT纳米复合材料在0.5 A·g时可实现497.6 F·g的高比电容，当电流密度增加五倍时，其电容仍保持在初始电容的66%以上。此外，还研究了TiCT浓度和反应时间对所得产物形貌和性能的影响，从而深入了解了纳米复合材料的形成过程以及超级电容反应的电化学机理。
