期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2016
卷号：5
期号：6
页码：17-22
DOI：10.15587/1729-4061.2016.79406
语种：English
出版社：PC Technology Center
摘要：Nickel hydroxide is widely used as an active material for hybrid supercapacitors. To improve the characteristics of supercapacitors, Ni(OH)2 with the optimal parameters to be determined should be synthesized. For this, Ni(OH)2 samples were prepared by various methods: decomposition, homogeneous precipitation, electrochemical synthesis using slit diaphragm electrolyzer under various current densities, with diaphragm or membrane, carbonate activation, immediate ultrasound post-treatment and an industrial sample, prepared by chemical route. Structural properties of the samples were studied by X-ray phase analysis, specific surface area – BET method by nitrogen adsorption, electrochemical characteristics – galvanostatic charge-discharge cycling in the supercapacitor mode. It has been demonstrated that high specific capacity is the most affected by α (or layered α+β) structure, optimal (average or low) crystallinity, introduction of activating additive and the ability of particle agglomerates to undergo breakdown into smaller particles during charge-discharge. Specific surface area has little influence on specific capacity. The sample prepared in slit diaphragm electrolyzer at 15.7 A/dm2 has a layered type of crystal structure, and the ability of particle agglomerates to undergo breakdown into smaller particles during charge-discharge, and showed the highest specific capacity of 650 F/g.
