Influence of temperature on the characteristics of Ni(II), Ti(IV) layered double hydroxides synthesised by different methods

Abstract

Ni(II)-Ti(IV) шарові подвійні гід-

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

“…A titration method is used in which an alkaline solution is added to a solution of metal cations (Ni 2+ and Al 3+ ). However, it has been demonstrated in the paper [8] that such method can lead to the formation of hydroxysalts that can have a significantly lower electrochemical activity. Thus, it is more feasible to employ precipitation at high supersaturation in which metal cation solution (Ni 2+ and Al 3+ ) is slowly added to the alkaline solution [12], resulting in a formation of a single layered double hydroxide phase.…”

“…However, its stability in concentrated alkali is significantly lower, especially at elevated temperature, the α-Ni(OH) 2 transforms into β-Ni(OH) 2 [6], which is accompanied by loss of capacity. The stabilization of α-form is achieved by transforming pure α-Ni(OH) 2 into layered double hydroxide (LDH) ( ) ( ) [7], Ti 4+ [8], Mn 3+ [9] can be used as stabilizing metal cation. The most promising is a formation of Ni-Al LDH [10,11] because Al 3+ has low atomic weight and is effective at stabilizing α-structure.…”

The properties investigation of the faradaic supercapacitor electrode formed on foamed nickel substrate with polyvinyl alcohol using

“…It would appear that the main effect is caused by soaking in KNO 3 and PVA solution, while cathodic polarization and soaking duration do not affect the electrode capacity significantly.…”

“…3 It is known that the surface of nickel is covered by the oxide-hydroxide layer. Therefore, the nickel foam matrix was subject to charge-discharge cycling, in order to evaluate its own capacity.…”

“…This compound also finds applications in other fields: oxidation of organic compounds [3], sensors [4] and as electrochromic material [5,6]. Nonetheless, the field of nickel hydroxide application is constantly growing.…”