花状NiCo-LDH/CB复合材料的制备及其电化学性能研究

以乙醇为溶剂,采用溶剂热法制备了三维花状层状双氢氧化物(Layered Double Hydroxides, LDH)与炭黑(Carbon Black, CB)复合的复合材料。采用X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、扫描电子显微镜(SEM)对样品的结构和形貌进行表征,并通过循环伏安、交流阻抗和恒流充放电研究了材料的电化学性能。结果表明,作为超级电容器电极材料,所制备的NiCo-LDH/CB和NiCo-LDH/CB-D电极在1 A·g^-1电流密度下的比电容分别为1 520 F·g^-1和2 127 F·g^-1,即使在7 A·g^-1高电流密度下,其比电容仍可达1 438 F·g^-1和2 011 F·g^-1,容量保持率为94.6%和94.5%。与单纯的花状NiCo-LDH相比,CB的引入明显提升了材料的电化学性能。

Preparation and Electrochemical Performance of Flower-Like NiCo-LDH/CB Composite

The composite of three-dimensional flower-like layered double hydroxides (LDH) with carbon black (CB) was prepared by solvothermal method using ethanol as the solvent. X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM) were used to characterize the structure and morphology of the samples. Cyclic voltammetry, AC impedance, constant current charge and discharge were used to analyze the electrochemical properties of materials. The results show that the prepared NiCo-LDH/CB and NiCo-LDH/CB-D electrodes have specific capacitances of 1 520 F·g^-1 and 2 127 F·g^-1 at a current density of 1 A·g^-1 respectively when used as electrode materials for supercapacitors. Even at the high current density of 7 A·g^-1, their specific capacitance can still reach 1 438 F·g^-1 and 2 011 F·g^-1, and the capacity retention rate is 94.6% and 94.5%. Compared with pure flower-like NiCo-LDH, the introduction of CB significantly improves the electrochemical performance of the material.