Abstract
In the modern world, one promising direction is the production and use of multifunction compounds. Ni-Al layered double hydroxide is widely used as the active material in supercapacitors. Nickel compounds are also colored and can be used as pigments. The characteristics of bi-functional indigo carmine intercalated Ni-Al (Ni:Al=4:1) hydroxides, synthesized at an equilibrium рН and рН=14 have been studied. The crystal structure of the prepared samples was studied by means of X-ray diffraction analysis and thermogravimetry, pigment characteristics – by measuring and calculating color characteristics in CIELab and XYZ systems, electrochemical characteristics – cyclic voltammetry and galvanostatic charge-discharge cycling. Comparative analysis of the electrochemical characteristics of Ni-Al-indigo carmine and Ni-Al-carbonate hydroxides has been conducted. Using XRD and thermogravimetry analysis methods, it was found that Ni-Al–indigo carmine hydroxide is a layered double hydroxide with the structure of α-Ni(OH)2 with average (synthesis at рН=14 and low (synthesis at equilibrium рН) crystallinity. It was found that synthesized Ni-Al-indigo carmine LDH had color bordering between light and blue (color tone 483–485 nm) with the lightness of 40–50 % and average color purity. It was found that the specific capacity of indigo carmine intercalated Ni-Al LDH (synthesis at рН=14 exceeded that of carbonate intercalated: the maximum specific capacity at full discharge was 1,007 F/g hydroxide and 2,996 F/h Ni, at discharge to 0 В –946 F/g. First, for Ni-Al-indigo carmine LDH, two discharge plateaus were observed, which correspond to the discharge of Ni3+ and indigo carmine
Highlights
Nickel compounds are widely used for different purposes
It should be noted that the Ni4Al-Ind pH=equil sample (Fig. 1, b), synthesized at an equilibrium рН, has a significantly lower crystallinity
It should be noted that the Ni4Al-Ind pH=equil sample, synthesized at an equilibrium рН, has a darker color and higher color saturation
Summary
Nickel compounds are widely used for different purposes. Owing to the formation of stable compounds in different oxidation states and the ability to transition between them, nickel compounds (hydroxides and oxides) are used in electrochemical devices. Different types of nickel hydroxides posses rather high electrochemical activity [1]. These compounds are widely used in different electrochemical devices [2, 3]. Nickel hydroxide along with double nickel hydroxides is used as the active material of nickel oxide electrode in alkaline accumulators [4, 5]. Nickel hydroxide and Ni-LDH are used in electrocatalysis [11, 12], namely for electrochemical oxidation of organic compounds [13], and sensors [14]
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