Structure, morphology and electrochemical performance of Zn-doped [Ni4Al(OH)10]OH

The relationship between structural stability and electrochemical performance of multi-element doped alpha nickel hydroxide

“…3(1). The FWHM of peaks at 11 decreases gradually from A to C. The result reveals that the degree of crystallinity is increased with the increased doped ion ratio, which may improve the electrochemical performance of alpha nickel hydroxide [22,23]. The result from Fig.…”

“…Generally, E R , E O and E OR represent reduction, oxidation and oxygen evolution peak potential, respectively. The potential difference (DE O,R ) between oxidation peak and reduction peak potentials can be used in evaluating the reversibility of the redox reaction: smallerDE O,R means more reversible electrode reaction; while the potential difference (DE O,OR ) between oxidation peak and oxygen evolution peak potentials can be used in evaluating charge efficiently: higher DE O,OR means better charge efficiently [25,26]. We can see from Table 6 The result reveals electrode c keep the best reversibility and charge efficiently.…”

Structure and electrochemical properties of nanometer Cu substituted α-nickel hydroxide

“…However, pure a-Ni(OH) 2 is unstable and can easily transform to b-Ni(OH) 2 in strong alkaline solution [5]. To improve the stability of a-Ni(OH) 2 , much research work has been carried out on partial substitution of nickel ion with other metal additives such as Al [3,4], Y [6], Fe [7], Co [8], Mn [9], Zn [10] in the nickel hydroxide lattice. The principle is to anchor anion as well as enhance bonding by increasing the positive charge in NiO 2 layer, so that the anions and water molecules are maintained and the lattice constants remain stable.…”

A comparative study of structural and electrochemical properties of high-density aluminum substituted α-nickel hydroxide containing different interlayer anions

“…Besides, a-Ni(OH) 2 can easily avoid volume expansion since there is no mechanical deformation during the charge/discharge cycles [7]. Unfortunately, due to the structural instability of a-Ni(OH) 2 in alkaline solutions, it has to be stabilized by substituting nickel ion in the a-Ni(OH) 2 lattice by other metal ions, such as Al [1,8e13], Co [14e16], Fe [17], Mn [18e20], or Zn [4,11,21,22]. Among these metal ions, aluminum is the most attractive because of its high stability in the trivalent state and cheapness.…”