In SituNi/Al Layered Double Hydroxide and Its Electrochemical Capacitance Performance

Abstract

Electrodes of Ni/Al layered double hydroxide (Ni/Al LDH) coated on the surface of nickel foam are successfully prepared by an in situ method using a mixed aqueous solution of nickel nitrate and aluminum. Their structure and surface morphology are studied by X-ray diffraction and scanning electron microscopy analysis. Their supercapacitance performances are investigated by cyclic voltammetry and constant current charge/discharge measurements. Results show that Ni/Al LDH nanoplatelets densely cover the nickel foam substrate. The electrode shows excellent electrochemical capacitive character and displays a specific capacitance of 701 F g−1 at a current density of 10 mA cm−2. The capacitance loss is less than 6% after 400 charge−discharge cycles. The larger contact area between the nickel foam supporter and active materials greatly enhances the use of Ni/Al LDH.

Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors

“…29 In other words, in the presence of a mixture of Ni 2+ and Al 3+ salts, the continuous supply of carbonate (CO 2 − ) and hydroxide (OH − ) at a controlled rate from urea decomposition leads to the formation of the founding double hydroxide nanoparticles. 14 The whole evolution/growth process could be likened to the three-stage process reported in previous studies 32 which involves a fast nucleation of amorphous primary particles, followed by crystal growth and final self-assembly. Over the course of the reaction, the concentration of the reactants in the reaction medium is decreased and a chemical equilibrium between the solid-liquid interfaces is established.…”

P3HT:PCBM/nickel-aluminum layered double hydroxide-graphene foam composites for supercapacitor electrodes

“…The specific capacitance was also calculated from the galvanostatic CD curves using the formula [28]:…”

“…They have been used extensively for various applications due to their tunable composition, large surface area and flexible ion exchangeability [28,29]. Hence the synergetic properties of both P3HT:PCBM and the LDHs should, in theory, improve the capacitive properties of the composite.…”

Electrosynthesized Ni-Al Layered Double Hydroxide-Pt Nanoparticles as an Inorganic Nanocomposite and Potentate Anodic Material for Methanol Electrooxidation in Alkaline Media

“…In particular, the LDH containing transition metal ions in the lattice of theirs octahedral layer with redox properties, such as Cu, Ni and Fe, have been widely synthesized and exploited in many practical catalytic applications [19,28]. Ni-Al LDH not only possess all the advantages of common LDH but also have the electrochemical activity because of the presence of a reversible one-electron redox couple, Ni(III)/Ni(II), which allows their application in electrochemistry area [29][30][31]. Electrochemical applications of LDH to electrochemical sensors, electrocatalysts, dye-sensitized solar cells and super capacitors were presented [32][33][34][35][36][37].…”