摘要
采用超声波辅助沉淀法分别在单元掺杂、二元掺杂和不掺杂三种情况下制备了三种不同镍源的纳米氢氧化镍,研究三种阴离子(NO-3,Cl-,SO2-4)对产物晶相结构及稳定性的影响。结果表明:未掺杂时,半径较大的SO2-4离子有利于α-Ni(OH)2的形成;在单掺杂Co(Ni 2+∶Co2+=1∶0.20)时,NO-3离子不仅有利于α-Ni(OH)2的形成,而且可以使α-Ni(OH)2在碱液中保持较高的稳定性;当复合掺杂Co/Cu(Ni 2+∶Co2+∶Cu2+=1∶0.15∶0.05)时,三种镍源制得的样品均为纯α-Ni(OH)2结构,但以Ni(NO3)2为镍源的α-Ni(OH)2在碱液中结构稳定性较高,NiCl2次之,NiSO4较差。可见,α-Ni(OH)2结构及稳定性既与掺杂情况有关,也与阴离子密切相关。
Nanometer nickel hydroxide with three kinds of nickel sources were synthesized by ultrasonic-assisted precipitation under single,double and no doping condition.The effect of three anions（NO-3,Cl-,SO2-4）which comes from nickel sources on the crystal structure and stability of samples were investigated.The results indicate that the larger ion radius SO2-4 is more in favor of the formation ofα-Ni（OH）2 in the case of undoping.In the single doped Co samples（Ni 2＋∶Co2＋=1∶0.20）,NO-3 anion is not only conducive to formα-Ni（OH）2,but also can keep high stability ofα-Ni（OH）2 in alkali solution.When co-doped Co/Cu（Ni 2＋∶Co2＋∶Cu2＋=1∶0.15∶0.05）,the samples which were prepared using three nickel sources are all pureα-Ni（OH）2 structures,however,the stability of the nickel nitrate dopedα-Ni（OH）2in alkali solution is higher,which is using Ni（NO3）2 as nickel source,NiCl2 is lower,NiSO4 is the lowest.It can be concluded that the structure and stability ofα-Ni（OH）2 is not only related to doping condition,but also related with anions.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2015年第8期25-30,共6页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(11304045)
广东省自然科学基金资助项目(S2012010009955)
广州市科技计划资助项目(2013j4100011)
