Layer by layer synthesis of zinc-iron layered hydroxy sulfate for electrocatalytic hydrogen evolution from ethanol in alkali media

Abstract

This paper proposes a method for producing nanocomposite electrocatalytic coatings based on zinc-iron layered hydroxy sulfate Zn 2 Fe 4 (OH) 12 SO 4 • 8H 2 O and iron(III) hydroxide Fe(OH) 3 using the successive ionic layer deposition (SILD) method. The obtained materials were investigated with the methods of SEM and EDX, XRD, FTIR spectroscopy, and also were analyzed their electrocatalytic performance. These compounds are formed on the surface of the substrate in nanosheets shape with an average size of 6-17 nm, which self-organized into coral-like agglomerates. It was shown that by varying the anionic component of the reaction solution -NO 3− , SO 2− 4 or Cl − , effective control of the 2D nanocrystals phase composition is possible. It has been determined that electrocatalytic materials based on Zn 2 Fe 4 (OH) 12 SO 4 •8H 2 O and Fe(OH) 3 are active in the process of hydrogen evolution from alkaline water-alcohol solutions. In result overpotential value of hydrogen evolution reaction at 10 mA cm −2 decreases about ∼ 10%, as well as energy consumption to carry out this process reduces about 8-12%. as shown from the decline of the Tafel slope. The developed materials have high cyclic stability and short non-stationary mode, which allows them to be considered as the base of electrocatalysts for the processes of hydrogen evolution from ethanol in an alkaline medium.

Personalized energy systems based on nanostructured materials

“…Nanostructured catalysts represent a separate area of materials for personalized energy. In this area, effective catalysts based on nanoparticles of d-and f-element oxides and hydroxides have been developed for the electrocatalytic production of hydrogen from water-alcohol solutions [327][328][329][330][331], photocatalysts based on simple and complex oxides [123, 135-139, 233, 332], carbon monoxide oxidation catalysts [333][334][335][336], and acid-base n-hexane conversion catalysts [337][338][339]. Obtained in the form of isometric nanoparticles, nanorods, nanoplates, and porous compositions (Fig.…”

Synthesis Ni-doped CuO nanorods via Successive Ionic Layer Deposition method and their capacitive performance

“…This method is based on the successive and repeated adsorption on the surface of the cations and anions substrate, which interact and give a nanolayer of an insoluble compound. The SILD method has great potential for practical use to form nanolayers on the surface of the products of complex shapes and has been used earlier, for example, for the synthesis of NiO 1+x •nH 2 O [13], MnOOH [14], CoOOH [15], AgMnO 2 [16], Co-doped Cu(OH) 2 [17], CoO-NiO solid solution [18], and also Zn-Fe layered double hydroxysulfate [19,20] which can be used as materials for electrocatalytic reforming of ethanol.…”

Successive ionic layer deposition of Co-doped Cu(OH)2 nanorods as electrode material for electrocatalytic reforming of ethanol

“…The layer-by-layer method is one technique that allows the synthesis of the nanocomposites mentioned above [28][29][30]. It is based on the sequential absorption of precursors on the substrate surface, followed by the removal of excess reagents.…”