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Green Process for Preparation of Nickel Hydroxide Films and Membranes
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-18 , DOI: 10.1007/s11665-020-05100-5
Audrey Vecoven , Dewan Russel Rahman , Allen W. Apblett

Nickel hydroxides have numerous applications including as battery electrodes, electrochromic devices, electrochemical sensors, and supercapacitors and in such processes as photocatalysis, electrocatalysis, and electrosynthesis. A simple solution growth process for production of beta-Ni(OH)2 has been developed. The process involves dissolution of nickel hydroxide powders in concentrated ammonia to form [Ni(NH3)6](OH)2. If ammonia is allowed to evaporate from the resulting solution, the dissolution process is reversed and crystalline films of beta-Ni(OH)2 are deposited that consist of closely packed micron-sized clumps of thin plates. Addition of sodium aluminate to the solution makes it possible to also prepare alpha nickel hydroxide as free standing membranes at air–water interface. The overall procedure can be described as a green process since it eliminates the environmental burden of by-product production because Ni(OH)2 is simply dissolved and transformed into the desired material without producing waste salts such as ammonium nitrate or ammonium chloride that would be produced by a conventional precipitation approach for Ni(OH)2 membrane or film preparation.



中文翻译:

制备氢氧化镍薄膜和膜的绿色工艺

氢氧化镍具有许多应用,包括用作电池电极,电致变色装置,电化学传感器和超级电容器,以及在诸如光催化,电催化和电合成的过程中。已经开发出用于生产β-Ni(OH)2的简单溶液生长方法。该方法涉及将氢氧化镍粉末溶解在浓氨中以形成[Ni(NH 36 ](OH)2。如果使氨从生成的溶液中蒸发,则溶解过程将逆转,且β-Ni(OH)2的晶体膜沉积物由紧密堆积的微米大小的薄板块组成。向溶液中添加铝酸钠还可以制备α-氢氧化镍,作为在空气-水界面的独立膜。整个过程可以描述为绿色过程,因为它消除了副产品生产的环境负担,因为Ni(OH)2可以简单地溶解并转化为所需的材料,而不会产生废盐,例如硝酸铵或氯化铵。通过常规沉淀方法制备的Ni(OH)2膜或膜制备方法。

更新日期:2020-09-20
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