NiMn-LDH/MnMoO_(4)/CC柔性复合电极的制备及其赝电容性能

Preparation and psedocapacitance properties of NiMn-LDH/MnMoO_(4)/CC flexible electrode

为提升层状双氢氧化物(LDH)的电化学性能及其在柔性超级电容器方面的应用,采用分步水热法在碳布(CC)表面先后生长MnMoO_(4)和镍锰层状氢氧化物(NiMn-LDH)纳米片,得到复合纳米阵列电极NiMn-LDH/MnMoO_(4)/CC。分别以该柔性电极和AC/CC作为正极和负极,组装成NiMn-LDH/MnMoO_(4)/CC//AC/CC柔性超级电容器。测试结果表明,该柔性电极在1 A·g^(-1)电流密度时比电容为2304.5 F·g^(-1),20 A·g^(-1)时倍率为78.2%。该器件可提供的最高能量密度为20.5 Wh·kg^(-1),最大功率密度为4804.1 W·kg^(-1);经10000次循环后电容保持率达到96.6%。此外,此柔性器件电极经扭曲后的比电容仍可保持正常状态的96.0%,具有较好的柔韧性和电化学性能。

In order to improve the electrochemical performance of layered double hydroxide(LDH)and its application in flexible supercapacitors,MnMoO_(4)and Nickel-Manganese layered hydroxides(NiMn-LDH)nanosheets were grown on the surface of carbon cloth(CC)by stepwise hydrothermal method,and the NiMn-LDH/MnMoO_(4)/CC composite electrode with nanoarray microstructure was obtained.NiMn-LDH/MnMoO_(4)/CC//AC/CC flexible supercapacitors were assembled by exploiting the flexible electrode and AC/CC as positive and negative electrode materials respectively.The test results of three electrodes show that the specific capacitance for the electrode is 2304.5 F·g^(-1)at 1 A·g^(-1)current density,and the ratio of the flexible electrode attains 78.2%at a current density of 20 A·g^(-1).The device presents the maximum energy density of 20.5 Wh·kg^(-1),and the maximum power density of 4804.1 W·kg^(-1).After 10000 cycles,the specific capacitance retention rate holds 96.6%.In addition,the specific capacitance of the twisted electrode of the flexible device can still maintain 96.0%of the normal state,showing good flexibility and electrochemical performance.