A study of Several Systems of the type Li_z[Co_yNi_(1-y)](1-x)O

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

“…In the bulk of the material, the metal cation distribution is homogeneous and the lattice parameter varies linearly with x from a = 4.1684 Å for NiO (x = 0) to a = 4.2667 Å for CoO (x = 1), in agreement with Vegard's law [4]. Auger and XPS intensity data presented here indicate that the surface composition presents a more complicated picture.…”

“…For example, CoO and NiO fi nd use, individually, as partial oxidation catalysts [1] and as promoters for hydrodesulfurization catalysis [2]. They can also be mixed in all proportions, Co x Ni 1−x O with 0 ≤ x ≤ 1, to form homogeneous solid solutions in a well-ordered rocksalt crystal structure in the bulk material [3,4]. As solid solutions, they have been demonstrated to be electrochemically active in redox processes under alkaline conditions [5].…”

A Potentiostatic Pulse Study of Oxygen Evolution on Teflon‐Bonded Nickel‐Cobalt Oxide Electrodes

“…Many claims exist for higher oxides, as in the case of cobalt, but again these appear to be stable only as hydrates, e.g., Ni20~.2H20 and NiO1.9 • H20. The unit cell parameters of the cubic CoO and NiO phases are sufficiently similar (4.26 and 4.18A, respectively) to permit the formation of solid solutions throughout the whole composition range (6). In addition, there is a spinel-type mixed oxide based on Co304 which is readily formed (7), provided the nickel content (cation fraction) is not greater than one-third (8).…”

Bio-inspired synthesis of NaCl-type CoxNi1−xO (0 ≤ x < 1) nanorods on reduced graphene oxide sheets and screening for asymmetric electrochemical capacitors

“…Single phase NaCl-type Co x Ni 1Àx O compounds are usually prepared by physically mixing CoO and NiO at different molar ratios, which are then thermally treated for the cobalt and nickel ions to inter-diffuse, forming a homogeneous solid. 19,20 By classical crystallization it is difficult, if not impossible, to obtain a single phase NaCl-type Co x Ni 1Àx O nanocrystal in aqueous solution. Such single phase oxide nanocrystals, however, may be synthesized via an amorphous precursor pathway.…”