NiO/龙舌兰衍生多孔碳复合材料的制备及电化学性能

先采用水热法再经过煅烧处理，将氧化镍均匀负载到龙舌兰多孔碳上。采用X射线衍射（XRD）、扫描电镜（SEM）、红外辐射检测等，对NiO/龙舌兰衍生多孔碳复合材料（NiO/C）的结构和形貌进行表征，并通过循环伏安和充放电测试对NiO/C的电化学性能进行研究。结果表明：NiO/C-2具有优秀的能量密度与循环稳定性，在5 A/g的电流密度下，能量密度可达22 W·h/kg；循环10 000次后，容量保持率高达91%。此外，当电流密度为1 A/g时，NiO/C-2的比电容为312 F/g；当电流密度增大到20 A/g时，比电容仍高达155 F/g 。因此，基于龙舌兰多孔碳的结构稳定性，适量的NiO负载可以提升材料的比电容和循环稳定性。

Preparation of NiO/ Agave-Derived Porous Carbon Composites and Their Electrochemical Properties

The nickel oxide was uniformly loaded onto the agave porous carbon by hydrothermal method and then by calcination treatment. The structure and morphology of the nickel oxide/agave-derived porous carbon composites were characterized by X-Ray Diffraction, Scanning Electron Microscope and Infrared Radiation. Furthermore, electrochemical properties of the nickel oxide/agave porous carbon composites were investigated by cyclic voltammetry test and charge-discharge test. The results show that NiO/C-2 has excellent property in energy density and cycling stability, exhibiting energy density of 22 W·h/kg and capacity retention of 91% after 10 000 cycles at a current density of 5 A/g. The specific capacitance of NiO/C-2 is 312 F/g at a current density of 1 A/g, and the capacity is still as high as 155 F/g when the current density is increased to 20 A/g. Therefore, based on the structural stability of agave porous carbon, the appropriate amount of NiO loading can enhance the capacity and cycling stability of the material.