I want to synthesize cobalt substutite alpha nickel hydroxide from Ni(II).(NO3)2 and Co(II).(NO3)2 precursor by increasing solution's pH.
During the precipitation reaction, anions in the solution are intercalated to Ni(OH)2 structure. To obtain a stable alpha nickel hydroxide, oxidation state of Co must be 3. But in the solution, cobalt's oxidation state 2.
Is it possible to synthesize Co+3 intercalated Ni(OH)2 from such a system.
Thanks in advance
Dear Turan, since 1962 we know the existence of compounds as XeF6, see “Chernick C.L., Rec. Chem. Prog., 24, 139-155, (1962)”. As a result the understanding of the notion of valence has to be revisited. I do this in “From Ln valence to that of 3d”. I will be glad if this can be helping for you.
Dear Turan Ilhan thank you for your interesting technical question. It is known that in basic medium in the presence of oxygen (air) cobalt(II) can be oxidized to cobalt(III), whereas nickel remains divalent under these conditions. The air oxidation of cobalt(II) is widely utilized for the synthesis of cobalt(III) ammine complexes such as [Co(NH3)6]3+. There are a few articles available in the chemical literature in which the intercalation of trivalent cobalt in nickel(II) hydroxide is reported. In this context please have a look at the following relevant articles:
Effect of Interlayer Co2+ on Structure and Charge Transfer in Ni/Fe Layered Double Hydroxides
https://www.osti.gov/servlets/purl/1608291
Rechargeable Na/Ni batteries based on the Ni(OH)2/NiOOH redox couple with high energy density and good cycling performance
https://pubs.rsc.org/fi/content/articlepdf/2019/ta/c8ta10830g?page=search
Co3O4/Ni(OH)2 composite mesoporous nanosheet networks as a promising electrode for supercapacitor applications
Article Co3O4/Ni(OH)2 composite mesoporous nanosheet networks as a p...
All three articles are freely available as public full texts. Good luck with your work and please stay safe and healthy! 😊
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Polymers