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-层状双氢氧化合物(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,混合超级电容器(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-layered double hydroxides (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 hybrid supercapacitor (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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