Wang Guixia, Yang Zhuo, Nie Xinyue, Wang Min, Liu Xianming
Henan Key Laboratory of Function-Oriented Porous Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China.
School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China.
Micromachines (Basel). 2023 Jul 28;14(8):1515. doi: 10.3390/mi14081515.
MXene-based composites have been widely used in electric energy storage device. As a member of MXene, niobium carbide (NbC) is a good electrode candidate for energy storage because of its high specific surface area and electronic conductivity. However, a pure NbC MXene electrode exhibits limited supercapacitive performance due to its easy stacking. Herein, sodium anthraquinone-2-sulfonate (AQS) with high redox reactivity was employed as a tailor to enhance the accessibility of ions and electrolyte and enhance the capacitance performance of NbC MXene. The resulting NbC-AQS composite had three-dimensional porous layered structures. The supercapacitors (SCs) based on the NbC-AQS composite exhibited a considerably higher electrochemical capacitance (36.3 mF cm) than the pure NbC electrode (16.8 mF cm) at a scan rate of 20 mV s. The SCs also exhibited excellent flexibility as deduced from the almost unchanged capacitance values after being subjected to bending. A capacitance retention of 99.5% after 600 cycles was observed for the resulting SCs, indicating their good cycling stability. This work proposes a surface modification method for NbC MXene and facilitates the development of high-performance SCs.
基于MXene的复合材料已广泛应用于电能存储设备。作为MXene的一员，碳化铌（NbC）因其高比表面积和电子导电性，是一种良好的储能电极候选材料。然而，由于其易于堆叠，纯NbC MXene电极的超级电容性能有限。在此，具有高氧化还原活性的蒽醌-2-磺酸钠（AQS）被用作一种调节剂，以提高离子和电解质的可及性，并增强NbC MXene的电容性能。所得的NbC-AQS复合材料具有三维多孔层状结构。基于NbC-AQS复合材料的超级电容器（SCs）在扫描速率为20 mV s时，表现出比纯NbC电极（16.8 mF cm）高得多的电化学电容（36.3 mF cm）。从弯曲后电容值几乎不变可以推断，SCs还表现出优异的柔韧性。所得SCs在600次循环后观察到电容保持率为99.5%，表明其具有良好的循环稳定性。这项工作提出了一种NbC MXene的表面改性方法，并促进了高性能SCs的发展。
