MnCo_(2)O_(4)/CNT复合材料的制备及其电化学性能研究

Preparation and Electrochemical Performance of MnCo_(2)O_(4)/CNT Materials

超级电容器作为一种新型储能装置被广泛应用,其具有高功率密度和快速充放电的优点。纯锰钴氧化物(MnCo_(2)O_(4))因相较于其他材料具有更优异的电导率,被应用于超级电容器。然而,MnCo_(2)O_(4)的高电阻率导致其结构不稳定及循环性能不佳,这最终会影响到超级电容器的比电容。本文引入碳纳米管(CNTs)作为复合材料,以提升电容特性和循环稳定性。所制备的MnCo_(2)O_(4)/CNT复合电极展现出1125.0 F·g^(-1)的比电容。在进行恒流充放电测试时,即使电流密度增加20倍,该电极仍能保持初始电容值的75.7%,显示出良好的倍率性能。这些结果不仅证实了MnCo_(2)O_(4)/CNT复合材料的成功制备,也证明了该电极在下一代超级电容器应用中的巨大潜力。

Supercapacitors,as an emerging class of energy storage devices,are gaining widespread adoption due to their high power densi-ty and rapid charge-discharge capabilities.Manganese cobalt oxide(MnCo_(2)O_(4)),owing to its superior electrical conductivity compared to other ma-terials,has seen significant application in supercapacitors.However,the intrinsic high resistivity of pure MnCo_(2)O_(4)leads to structural instability and diminished cycling performance,which adversely impacts the overall storage efficiency of supercapacitors.This study introduces carbon nanotubes(CNTs)as a composite component to augment both the capacitance and cycling stability.The resulting MnCo_(2)O_(4)/CNT composite electrode exhibits a specific capacitance of 1125.0 F·g^(-1).Upon undergoing constant current charge-discharge testing,the electrode retains 75.7%of its initial capacitance following a 20-fold increase in current density,signifying its excellent rate capability.These findings not only validate the successful synthesis of the MnCo_(2)O_(4)/CNT composite but also underscore its potential for deployment in next-generation supercapacitors.