Xu Wendong, Li Mai, Hu Haotian, Hasan Waqar Ul, Li Chenxi, Deng Qinglin, Meng Zheyi, Peng Xiang
College of Science, Donghua University, Shanghai 201620, China.
College of Science, Donghua University, Shanghai 201620, China.
J Colloid Interface Sci. 2025 Jul 15;690:137341. doi: 10.1016/j.jcis.2025.137341. Epub 2025 Mar 16.
In recent years, the rapid advancement of safe energy storage devices with high energy and power densities has generated significant interest in all-solid-state supercapacitors (SCs). MXene-based nanomaterials have emerged as promising candidates for energy storage owing to their exceptional redox properties, extensive surface area, and high metallic conductivity. Additionally, layered double hydroxides (LDHs), distinguished by their distinct nanostructures, and efficient ion channels, with elevated specific capacitance, have attracted interest. Consequently, a novel all-solid-state supercapacitor(AASCs) was fabricated by employing a hydrothermal method to integrate NiGa-LDH nanosheets with TiCT MXene, resulting in enhanced energy storage properties. The NiGa-LDH/TiCT MXene exhibits excellent properties, including a specific capacitance of 618.66 F g at 1 mA cm and 93.75 % capacitance retention after 5,000 cycles at 1 mA cm. The all-solid-state NiGa-LDH/TiCT MXene//activated carbon(AC) asymmetric supercapacitor (AASCs) demonstrates an impressive energy density of 20 Wh kg and a high power density of 400 W kg. Density-functional theory (DFT) studies show that NiGa-LDH/TiCT MXene has a high density of states (DOS) around the Fermi level and possesses a potassium ion adsorption energy of -2.36 eV. This study provides technical and theoretical insights into the design of intricate nanostructures utilizing MXene-based nanomaterials for all-solid-state energy storage device.
近年来，具有高能量和功率密度的安全储能装置的快速发展引起了人们对全固态超级电容器（SCs）的极大兴趣。基于MXene的纳米材料因其优异的氧化还原特性、大表面积和高金属导电性，已成为储能领域有前途的候选材料。此外，层状双氢氧化物（LDHs）以其独特的纳米结构和高效的离子通道以及较高的比电容而受到关注。因此，通过水热法将NiGa-LDH纳米片与TiCT MXene集成，制备了一种新型全固态超级电容器（AASCs），从而提高了储能性能。NiGa-LDH/TiCT MXene表现出优异的性能，在1 mA cm时比电容为618.66 F g，在1 mA cm下循环5000次后电容保持率为93.75%。全固态NiGa-LDH/TiCT MXene//活性炭（AC）不对称超级电容器（AASCs）表现出令人印象深刻的20 Wh kg的能量密度和400 W kg的高功率密度。密度泛函理论（DFT）研究表明，NiGa-LDH/TiCT MXene在费米能级附近具有较高的态密度（DOS），钾离子吸附能为-2.36 eV。本研究为利用基于MXene的纳米材料设计复杂纳米结构用于全固态储能装置提供了技术和理论见解。
