Cui Yuhan, Zhao Lijie, He Danfeng, Sun Jing, Yang Jinyue, Tang Wanxia, Yu Haixia, Lou Chunhua, Wang Wendi, Zhang Xinyou, Zhao Huaping
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, Heilongjiang Province 161006, China.
School of Chemistry and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Jilin Provincial International Joint Research Center of Photo-functional Materials and Chemistry, Changchun University of Science and Technology, Changchun 130022, China.
ACS Appl Mater Interfaces. 2024 Sep 11;16(36):47751-47762. doi: 10.1021/acsami.4c10803. Epub 2024 Aug 30.
At present, it is very necessary to select and prepare suitable positive and negative electrode materials to fabricate high-performance asymmetric supercapacitors. Metal-organic frameworks (MOFs) have garnered significant attention in the energy storage field due to their high conductivity. As a branch, the zirconium organic framework (UIO-66) is a promising porous material due to its large specific surface area and abundant Zr centers. Graphene oxide (GO) and MXene are very suitable as substrate materials for conducting an MOF due to their abundant active sites and adjustable interlayer distance. The GO/MXene@NiZrP prepared through an in situ composite of GO and Mxene with the hydrothermal method and calcining method showed excellent electrochemical performance. Compared with the precursor UIO-66, the specific capacitance of the final product GO/MXene@NiZrP increases more than ten times, mainly because of its special layered porous structure, and GO/MXene@NiZrP has a larger specific surface area, pore volume, and surface defects caused by unstable Zr than those of UIO-66. Using GO/MXene@NiZrP as the positive electrode and biochar (BC) as the negative electrode, an asymmetric supercapacitor, BC//GO/MXene@NiZrP, is assembled. After 10,000 cycles at a current density of 10 A g, the capacitance retention remains at 83.3%, showing excellent cycle stability.
目前，选择和制备合适的正负极材料以制造高性能非对称超级电容器非常必要。金属有机框架（MOF）因其高导电性在储能领域备受关注。作为一个分支，锆有机框架（UIO - 66）因其大比表面积和丰富的Zr中心而成为一种有前途的多孔材料。氧化石墨烯（GO）和MXene因其丰富的活性位点和可调节的层间距，非常适合作为负载MOF的基底材料。通过水热法和煅烧法将GO和Mxene原位复合制备的GO/MXene@NiZrP表现出优异的电化学性能。与前驱体UIO - 66相比，最终产物GO/MXene@NiZrP的比电容增加了十多倍，主要是因为其特殊的层状多孔结构，并且GO/MXene@NiZrP比UIO - 66具有更大的比表面积、孔体积和由不稳定Zr引起的表面缺陷。以GO/MXene@NiZrP为正极，生物炭（BC）为负极，组装了一种非对称超级电容器BC//GO/MXene@NiZrP。在10 A g的电流密度下循环10000次后，电容保持率仍为83.3%，显示出优异的循环稳定性。
