The electrochemical properties of the intercalation compounds cobalt hydroxide–aluminium hydroxide and nickel hydroxide–aluminium hydroxide

Abstract

The intercalation of AI(OH)*N03 into the layer structures of M(OH)2 (M = Co or Ni) forms M4AI(OH)loN03, in which Co on charging attains an oxidation state of +3.7 and Ni +3.9; the changes and improvements in the electrochemical properties of M4AI(OH)10N03 compared with M(OH)2 electrodes are described.

High-performance hybrid supercapacitors based on self-supported 3D ultrathin porous quaternary Zn-Ni-Al-Co oxide nanosheets

“…In particular, ZNACO electrode showed the lowest polarization impedance (i.e., the smallest size of the impedance loop) among all electrode materials studied. [5,49,52] Third, the incorporation of the smaller and more highly charged Al 3+ ion could distort the octahedral symmetry of Co ligands, promoting the supposedly inert Co(III) to be further oxidized to Co(IV) and thus resulting in enhanced electrochemical activity [53][54][55][56]. Furthermore, despite playing little role as an active site, the redox-inactive Al 3+ ions in ZNACO might still play some roles by assisting the reacting species in accessing the highly oxidized Co ions in the material, thereby allowing to undergo the redox reactions more efficient.…”

Two-dimensional ultrathin nanosheets of Ni–In-layered double hydroxides prepared in water: enhanced performance for DNA adsorption

“…8 Intensive research has been focused on LDHs due to their broad applications as catalysts, 9 re retardants, 10 drug-delivery hosts, 11,12 and electrochemical materials. [13][14][15][16] In particular, the application of LDHs as adsorbents for biomolecular adsorption 17,18 has attracted much attention due to their positively charged surfaces and signicant structures. Because DNA has become a central molecule in bionanotechnology, materials that can absorb DNA are useful for developing biosensors and gene delivery, and for DNA extraction and separation.…”

Layered double hydroxides of Ni with Cr and Mn as candidate electrode materials for alkaline secondary cells

“…The carbonates anchor the layers at an interlayer distance of 7.6 Å . Materials of this type with a composition of Ni A variety of Ni-based LDHs such as Ni-Al [4][5][6][7], Ni-Co [8][9][10], Ni-Fe [11][12][13] and Ni-Mn [14][15][16] have been studied as cathode materials. In each case, the LDHs have delivered superior charge storage capacities compared with b-nickel hydroxide.…”