Synthesis of Nanosized NiAl_2O_4 by Sacrificial Anode

The precursor NiAl_2(OCH_2CH_3)_((8-y))(acac)_y was synthesized by electrochemical dissolution of aluminum for 6 h and then nickel for 2 h at 0.2 A in ethanol and acetylacetone solution.Nanon NiAl_2O_4 powder was prepared from the electrolytic solution by direct sol-gel process under pH=8.5,drying and calcining at 350 ℃ for 2 h. IR spectrum,TG-DTA,XRD and TEM were used to investigate the structure of the precursor and nanosized NiAl_2O_4.The experiments showed that during electrolysis,the temperature controlled at 54～60 ℃ and concentration of Bu_4NBr of 0.040～0.045 mol/L as conductive additive could improve the current efficiency,and nanosized NiAl_2O_4 with a narrow size distribution of 20～30 nm can be obtained at a low calcination temperature of 350 ℃.