MXene/银纳米线超级电容器电极材料的电化学性能

Elecrochemical performance of MXene/silver nanowire supercapacitor electrode material

新型二维材料MXene具有比表面积大和导电性好等优点被广泛应用于超级电容器上,而银纳米线(AgNw)具有优异的导电性,是一种良导体。采用简单的混合自组装法制备出MXene/Ag Nw复合薄膜。使用X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、扫描电镜(SEM)及能谱仪(EDS)对其进行物像分析,利用电化学工作站对复合材料的电化学性能进行探究,结果表明当Ag Nw掺杂量为5%时电化学性能最好;在扫描速率为10 mV·s^-1时,比电容可达379.06 F·g^-1;并且电极具有良好的循环稳定性,恒电流10 A·g^-1下,1000次充放电后电容保持率达98.20%。

MXene with large specific surface area and good conductivity properties as a new 2D material has been explored as electrode materials for supercapacitor.Silver nanowire(Ag Nw)has been attracting more and more attention because of their intrinsic optical,thermal and electric properties.In this research,MXene/Ag Nw composites have been fabricated by a simple and“green”filtration self-assembly method.Their structure and morphology were analyzed with scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectrometer(FT-IR),energy dispersive spectrometer(EDS)as well as electrochemical properties tested on electrochemical workstation.The synergetic effect of MXene and silver nanowire constructed a three dimensional(3D)conductive network and enlarged the distance of MXene layers.The results revealed that MXene/Ag Nw composites exhibited a high specific capacitance(379.06 F·g^-1 at 10 mV·s^-1)when the concentration of Ag Nw is 5%which is higher than pure MXene(176.95 F·g^-1)and long-term cycling stability(98.20%capacitance retention over 1000 cycles).In a word,the MXene/Ag Nw composite films have exhibited an improved electrochemical performance when used as electrode materials for supercapacitor.