NiCo2S4纳米材料的制备及其电化学性能

Preparation of NiCo2S4 nanomaterials and their electrochemical properties

  • 摘要: 采用溶剂热方法制备出Co-MOF前驱体,通过Ni2+水解刻蚀前驱体得到空心NiCo-LDH材料,再将其高温煅烧硫化得到NiCo2S4材料。借助金属有机框架的特性使得NiCo2S4材料有着更加优异的性能。电化学数据表明,NiCo2S4材料1 A·g−1的电流密度下具有204.8 mA·h·g−1(1843.6 F·g−1)的高比容量,当电流密度增加到10 A·g−1时,其容量依然有着最初的50.9%。最后,以活性炭为负极,NiCo2S4材料为正极组装成为了混合型超级电容器,HSC装置在800 W·kg−1的功率密度下有着38 W·h·kg−1的能量密度并且在10 A·g−1的电流密度下循环5000圈后依然有着71.4%的容量保持率。

     

    Abstract: The Co-MOF precursor was prepared by solvothermal method, and the hollow NiCo-LDH material was obtained by hydrolyzing and etching the precursor with Ni2+, and then NiCo2S4 material was obtained by high temperature calcination and sulfurization. The properties of the metal-organic framework make the NiCo2S4 material have more excellent performance. The electrochemical data show that the NiCo2S4 material has a high specific capacity of 204.8 mA·h·g−1 (1843.6 F·g−1) at a current density of 1 A·g−1, and when the current density is increased to 10 A·g−1, its capacity is still 50.9% of the initial capacity. Finally, a hybrid supercapacitor was assembled using activated carbon as the negative electrode and NiCo2S4 material as the positive electrode, and the HSC device had an energy density of 38 W·h·kg−1 at a power density of 800 W·kg−1 and a capacity retention rate of 71.4% after 5000 cycles at a current density of 10 A·g−1.

     

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