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材料工程  2015 

阴离子(NO3-/Cl-/SO42-)对Ni(OH)2晶型及其结构稳定性的影响

DOI: 10.11868/j.issn.1001-4381.2015.08.005, PP. 25-30

Keywords: 镍源,氢氧化镍,结构稳定性,阴离子,&alpha,-Ni(OH)2晶相

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Abstract:

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(NO3-,Cl-,SO42-)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SO42-离子有利于α-Ni(OH)2的形成;在单掺杂Co(Ni2+Co2+=10.20)时,NO3-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(Ni2+Co2+Cu2+=10.150.05)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。

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