Obtaining of Ni–Al layered double hydroxide by slit diaphragm electrolyzer

Abstract

UDC 54.057:544.653:621.13:661.13

Influence of the carbonate ion on characteristics of electrochemically synthesized layered (α+β) nickel hydroxide

“…Anions can be those of precursor metal salts (nitrate [31]) or those formed during synthesis (cyanate [32]), or intestinally introduced (carbonates [33, 34]). α-Ni(OH) 2 , and nickel-based LDH can be prepared using chemical precipitation [34], homogeneous precipitation [35], electrolysis in the slit-diaphragm electrolyzer [36].…”

“…Synthesis method [36,39] is based on electrolysis in the flowthrough slit-diaphragm electrolyzer (SDE). The cathodic chamber was fed with nickel sulfate solution (concentration Ni 2+ 12.7 g/L), anodic chamber -NaOH solution (concentration 50 g/L), at a feed rate of 0.2 L/h, using the peristaltic pump.…”

Comparative investigation of electrochemically synthesized (α+β) layered nickel hydroxide with mixture of α-Ni(OH)2 and β-Ni(OH)2

“…In order to stabilize the a-structure, various additives, such as cations of other metals [27], are introduced into nickel hydroxide during synthesis [27]. Another effective method is the formation of layered double hydroxides (LDH), in which part of nickel cations are substituted with tri-or tetravalent cations, and the excessive positive charge is compensated with anions: Al 3+ and CO 3 2− [28,29], Ti 4+ and CO 3 2− [30]. a-Ni(OH) 2 possesses significantly higher electrochemical characteristics than β-Ni(OH) 2 , however, its stability is significantly lower.…”

Study of the influence of the template concentration under homogeneous precepitation on the properties of Ni(OH)2 for supercapacitors

“…The hydroxide synthesis can be achieved by precipitation using titration method (addition of basic solution to solution of nickel salt) [8], precipitation at high supersaturation (addition of nickel salt to a basic solution) [9,10]; high-temperature two-step synthesis [11], sol-gel [12]. The electrochemical methods [13,14], including slit-diaphragm method [15,16] are also used for synthesis.…”