Li Wen-Ze, Yang Ying, Zhang Xiao-Sa, Liu Yu, Luan Jian
College of Science, Shenyang University of Chemical Technology, Shenyang, 110142, P. R. China.
Nanoscale. 2024 Sep 12;16(35):16556-16570. doi: 10.1039/d4nr02277g.
Metal-organic frameworks (MOFs) are a class of porous materials that have been gradually applied in the field of supercapacitors, but they still present major challenges due to their inherent instability and poor conductivity. Herein, in order to solve these problems, Ni-based MOFs and their derivative materials with a particular spherical structure were prepared using a special calcination method. This unique structure not only improves the conductivity of the electrode, but also promotes the transport of electrons and ions during the electrochemical energy storage process. The as-prepared Ni-MOF@M-a4 has an amazing specific capacitance (637.78 F g) and a relatively low impedance. The fabricated asymmetric supercapacitor (ASC) consisted of Ni-MOF@M-a4 and activated carbon (AC) as positive and negative electrodes, respectively. The specific capacitance of this ASC was 18.14 F g. The maximum energy and power densities of the device reached 1.23 W h kg and 175.00 W kg, showing good electrochemical performance. In this work, both an innovative strategy for the rational preparation of MOF arrays with good orientation and a special material preparation method are proposed, which have promising application potential in the field of asymmetric supercapacitors.
金属有机框架材料（MOFs）是一类多孔材料，已逐渐应用于超级电容器领域，但由于其固有的不稳定性和较差的导电性，它们仍然面临重大挑战。在此，为了解决这些问题，采用特殊的煅烧方法制备了具有特定球形结构的镍基金属有机框架材料及其衍生材料。这种独特的结构不仅提高了电极的导电性，还促进了电化学储能过程中电子和离子的传输。所制备的Ni-MOF@M-a4具有惊人的比电容（637.78 F g）和相对较低的阻抗。所制备的非对称超级电容器（ASC）分别由Ni-MOF@M-a4和活性炭（AC）作为正负极组成。该ASC的比电容为18.14 F g。该器件的最大能量密度和功率密度分别达到1.23 W h kg和175.00 W kg，显示出良好的电化学性能。在这项工作中，提出了一种合理制备具有良好取向的MOF阵列的创新策略和一种特殊的材料制备方法，它们在非对称超级电容器领域具有广阔的应用潜力。
