Khan Jahangir, Ahmad Rana Tariq Mehmood, Yu Qiangmin, Liu Heming, Khan Usman, Liu Bilu
Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, P. R. China.
Department of Electrical Engineering, Narowal Campus, University of Engineering and Technology, Lahore, Pakistan.
Sci Technol Adv Mater. 2023 Aug 18;24(1):2242262. doi: 10.1080/14686996.2023.2242262. eCollection 2023.
Developing efficient electrode materials is a key towards high power electrochemical energy storage devices. Two-dimensional (2D) MXene shows excellent conductivity and electrochemical performance among other materials. However, the restacking of MXene layers may degrade their specific capacity and cycling performance. Considering this challenge, here we have designed a composite made of 2D MXene nanosheets and lanthanum oxide (LaO) nanoparticles to overcome the limitations. The bifunctionality of LaO nanoparticles prevents the restacking of MXene layers and enhances the electrochemical properties of the electrode due to its good Faradic characteristics. The specific capacitance of the LaO/MXene composite electrode is 366 F/g at 1 A/g, which is 4.5 and 3 times higher than those of the individual LaO and MXene. The composite electrode displays a capacitance retention of 96% after 1,000 cycles, which is due to synergistic effects between the two components and indicates the potential of LaO/MXene composite for supercapacitors.
开发高效的电极材料是实现高功率电化学储能装置的关键。二维（2D）MXene在其他材料中表现出优异的导电性和电化学性能。然而，MXene层的重新堆叠可能会降低其比容量和循环性能。考虑到这一挑战，我们在此设计了一种由二维MXene纳米片和氧化镧（LaO）纳米颗粒组成的复合材料，以克服这些限制。LaO纳米颗粒的双功能性可防止MXene层的重新堆叠，并因其良好的法拉第特性而增强电极的电化学性能。LaO/MXene复合电极在1 A/g时的比电容为366 F/g，分别是单独的LaO和MXene的4.5倍和3倍。复合电极在1000次循环后电容保持率为96%，这是由于两种组分之间的协同效应，表明LaO/MXene复合材料在超级电容器方面具有潜力。
