一步电沉积法制备针状镍钴双金属氧化物及电化学性能的研究

Preparation of needle-shaped nickel-cobalt bimetal oxide by one-step electrodeposition and its electrochemical properties

本文通过一步电沉积法在预处理的泡沫镍表面原位生长针状镍钴双金属氧化物,制备得到高负载量的正极材料NiCo2O4。对比文献报道,预处理的泡沫镍表面存在细小的孔道结构不仅具备模板作用,而且该模板能够提高单位面积上活性物质的负载量时,具有一定电容贡献,不用二次剔除,制备方法简单高效。经过电化学测试,活性材料NiCo2O4的负载量为5.24mg·cm^-2时,NiCo2O4-泡沫镍电极在1A·g^-1的电流密度下,获得高的质量比电容为773F·g^-1,在0.5A·g^-1的电流密度下,充放电测试3000圈,电容保持率为75%。显示该电极材料具有高的质量比电容和较好的循环使用寿命,该方法制备NiCo2O4-泡沫镍电极在超级电容器领域具有广泛的应用前景和一定的普适性。

In this paper,a high-capacity cathode material NiCo2O4 was prepared by in-situ growth of acicular nickel-cobalt bimetal oxide on the surface of pretreated foamed nickel by one-step electrodeposition.Compared to the literature,There is a small pore structure on the surface of pretreated nickel foam,which can not only act as a template,but also increase the loading of active material per unit area,the preparation method is simple and efficient.After electrochemical testing,The specific capacitance of 773F·g^-1 is achieved at mass loading of 5.24mg·cm^-2(1A·g^-1),the electrode maintains 75%of its capacitance even after 3000 cycles of galvanostatic charge-discharge at 0.5A·g^-1.It is shown that the NiCo2O4-foam nickel electrode can even maintain high mass ratio capacitance and good cycle life when the active material is highly loaded.The preparation of NiCo2O4-nickel foam electrode by this method has a wide application prospect and a certain universality in the field of supercapacitors.