NiCo_(2)O_(4)/RGO复合材料的制备及其电化学性能

Study on preparation of NiCo_(2)O_(4)/RGO composite material and its electrochemical performance

采用两步水热法制备NiCo_(2)O_(4)/RGO复合材料,并对其电化学性能进行研究.研究结果表明,当电流密度为1 A/g时,NiCo_(2)O_(4)/RGO复合材料的比电容高达2332.40 F/g,约是NiCo_(2)O_(4)材料的3倍,当电流密度增加至10 A/g时,其比电容还能保持为1127.22 F/g,表现出优异的倍率性能.这归因于复合材料特殊的多孔蓬松结构,有效增加了材料的比表面积,NiCo_(2)O_(4)的比表面积为56.4880 cm^(2)/g,而NiCo_(2)O_(4)/RGO复合材料的比表面积高达188.6042 cm^(2)/g,能够提供更多的反应活性位点,同时RGO能够有效提高材料的导电性,两者之间的协同作用使得电化学性能大幅提升.

The NiCo_(2)O_(4)/RGO composite material was prepared by a two-step hydrothermal method and its electrochemical performance was studied.The research results showed that when the current density was 1 A/g,the specific capacitance of NiCo_(2)O_(4)/RGO composite material was as high as 2332.40 F/g,which was about three times that of NiCo_(2)O_(4)material.When the current density was increased to 10 A/g,its specific capacitance could be maintained 1127.22 F/g,showing excellent rate performance.Due to the special porous and fluffy structure of the composite material,the specific surface area of the material is effectively increased.The specific surface area of NiCo_(2)O_(4)is 56.4880 cm^(2)/g,while the specific surface area of NiCo_(2)O_(4)/RGO composite material is as high as 188.6042 cm^(2)/g,which can provide more reactive sites,at the same time,RGO can effectively improve the conductivity of the material,thereby,the electrochemical performance is greatly improve.