Ammonia-Alkali Solution Coordination-Precipitation Route for Preparation of β-Ni(OH)2 Nano-Particles

摘要:

在室温条件下，以NiCl2·6H2O, NH3·H2O和NaOH为原料，通过滴加氢氧化钠溶液到[Ni(NH3)6]2+配合物离子溶液中，经氢氧根离子取代氨分子与镍离子结合，实现可控合成氢氧化镍纳米晶粒。采用傅里叶变换红外光谱（FT-IR），综合热分析（TGA-DTG）仪，X射线衍射（XRD）仪和扫描电子显微镜（SEM）等测试技术对实验样品性质进行分析。结果表明：氨-碱均匀沉淀技术制备的样品为β-Ni(OH)2，平均粒径约为100 nm，且β-Ni(OH)2含有较多的镍成分和很少的层间离子，有利于提高β-Ni(OH)2的电化学性质

Abstract:

Nano-sized nickel hydroxide particles were synthesized at room temperature by a facile coordination precipitation method, through simply dropping sodium hydroxide solution to dissociate the complex of nickel-hexammonia, using nickel chloride, ammonia and sodium hydroxide as raw materials. Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetry and derivative thermo-gravimetry (TG-DTG), X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were used to characterize the products. It is demonstrated that the product is pure β-type nickel hydroxide, which contains more nickel and fewer intercalated anions comparatively, and likely boosts its electrochemical activity. The average size of β-type nickel hydroxide nano-particles is about 100 nm