pH对掺杂Zn纳米Ni(OH)2电化学性能的影响

为研究pH值对掺锌氢氧化镍电化学性能的影响,采用沉淀转化法在不同pH下制备出掺杂Zn的纳米Ni(OH)₂. 利用XRD和TEM对材料的结构和微观形貌进行分析,利用循环伏安技术和恒流充放电技术对材料的电化学性能进行研究. 结果表明,pH=10时制备的材料是α型纳米Ni(OH)₂,随着pH的增大,材料逐渐变成α-Ni(OH)₂和β-Ni(OH)₂的混合物,且材料的团聚逐渐严重. pH的变化对材料的电化学性能影响明显. 随着pH的增加,材料的质子扩散系数增大;与pH=10时制备的材料相比,pH=12时制备的材料02C和3C放电比容量分别提高了20％和27％.

Effect of pH on the electrochemical performance of Zn-doped nano-scale Ni(OH)2

In order to research the effects of pH values on the electrochemical performance of Zn-doped nano-scale Ni(OH)2,the nano-scale Ni(OH)2 doped with Zn was prepared by precipitate transformation method at different pH,and characterized by XRD and TEM.The electrochemical performance was investigated by voltammetry(CV) and constant current technology.The measurement results indicate that the material prepared under pH=10 is a kind of α-type nano-scale Ni(OH)2,and with the increase of pH,the material becomes the mixture of α-Ni(OH)2 and β-Ni(OH)2,and the agglomeration of particles becomes obvious.pH exerts a great influence on the electrochemical performance of materials.With the increase of pH,the diffusion coefficient of materials becomes bigger.Compared with the material prepared at pH=10,the material prepared at pH=12 shows better discharge performance,its discharge specific capacity of 0.2C and 3C were enhanced by 20% and 27% respectively.