原位合成NiCo-MOF/MXene材料的电容性能研究

In-situ Synthesis of NiCo-MOF/MXene Material and its Capacity Properties Research

在不使用任何黏合剂的情况下,将镍钴双金属有机框架材料(NiCo-metal organic framework,NiCo-MOF)和MXene材料附着在泡沫镍(nickel foam,NF)表面,合成了高性能电极材料,这两种材料结合生长出的层状结构有利于离子的快速传导,减少了活性材料的无效堆砌,同时表现出理想的电化学性能。当投入原料的镍钴物质的量之比为1∶2时,制得的电极材料在5 mA/cm^(2)的电流密度下表现出4.96 C/cm^(2)的优良比电容。得到的电极与活性炭(activated carbon,AC)负极组装成不对称超级电容器后,在10.09 W/cm^(2)的功率密度下,得到的超级电容器的能量密度可达到1530 mWh/cm^(2),并且当功率密度升高到102.29 W/cm^(2)时,能量密度仍可以保持在770 mWh/cm^(2)。在15 mA/cm^(2)的电流密度下,经过5000次充放电循环后,不对称超级电容器的电容保持率为98.52%。

By attaching NiCo bimetallic Metal-organic frameworks(NiCo-MOF)and MXene onto the surface of the Nickel foam(NF),high-quality electrode has been synthesized without using any adhesive.The combination of these two materials grows a layer structure,which can fasten the ion exchange and reduce invalid stacking of the active material,and at the same time exhibits ideal electrochemical performance.When the mole ratio at Ni∶Co=1∶2,the obtained SCs shows best performance with 4.96 C/cm^(2) at the current density of 5 mA/cm^(2).After assembled with active carbon anode,the energy density of the obtained asymmetric supercapacitor can reach to 1530 mWh/cm^(2) under the power density of 10.09 W/cm^(2) and kept 770 mWh/cm^(2) when the power density reached to 102.29 W/cm^(2),also with 98.52%capacitance retention after 5000 cycles under the current density of 15 mA/cm^(2).