NiCo2O4/RGO复合材料的制备及其电化学性能

采用两步水热法制备NiCo₂O₄/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,NiCo₂O₄/RGO复合材料的比电容高达2 332.40 F/g,约是NiCo₂O₄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1 127.22 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,NiCo₂O₄的比表面积为56.488 0 cm²/g,而NiCo₂O₄/RGO复合材料的比表面积高达188.604 2 cm²/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.

Study on preparation of NiCo2O4/RGO composite material and its electrochemical performance

The NiCo₂O₄/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 NiCo₂O₄/RGO composite material was as high as2 332.40 F/g, which was about three times that of NiCo₂O₄ material. When the current density was increased to 10 A/g, its specific capacitance could be maintained 1 127.22 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 NiCo₂O₄ is 56.488 0 cm²/g, while the specific surface area of NiCo₂O₄/RGO composite material is as high as 188.604 2 cm²/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.