氨碱液相均匀沉淀技术制备β-Ni(OH)_2纳米颗粒（英文）

Ammonia-Alkali Solution Coordination-Precipitation Route for Preparation of β-Ni(OH)_2 Nano-Particles

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。

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.