- Needed starting materials: Sodium Acetate(Anhydrous), Cobalt Acetate Tetrahydrate, Chelating Agent: Citric Acid
- To make 3g of NaCoO2 powder Stoichiometrically how much amount of NaAc; CoAc.4H20; Chelating agent Citric Acid for gel formation?
- NaAc and CoAc - mix & stir in how much ml of DI water
- 80*C for 3hrs for particle homogenization
- Citric Acid added and stir again - 80*C for 6 hours
- Obtain the gel precursor
Dear Harshith Venkat V ,
> n = m / M
m = 3g of NaCoO2 (with M = 113.92 g/mol), means n = 0.02633 mol
Knowing M(NaAcetate) = 82.03 g/mol and M(CoAcetate) = 177.02 g/mol you can calculate the corresponding stoechiometric mass... **EDIT : Forgot the Tetrahydrate, proper mass for CoAcetate.Tetrahydrate is 249.02 g/mol***
> DI water need to be in amount sufficient to solubilise all your precursors (try to have a look to solubility of these precursors in water if Needed, for instance Sodium acetate is like 365 g/L so you can calculate how much mL you need for your calculated mass) or just check if there is no remaining solids in your glassware before mixing everything.
> Citric acid is a chelating agent, need to be in sufficient amount for chelation of all your cations in solution (1 Na and 1 Co) in molar proportions (people tends to add excess just to be sure). If you want to have more details on impact of citric acid proportions, there is several reports in the literature.
Article The Effect of Citric Acid Concentration on the Properties of...
Article Influence of the metal nitrates to citric acid molar ratio o...
Please keep in mind that there is a complex phase diagram with these materials, temperature need to be selected carefully Article Synthesis and Stoichiometry of Different Layered Sodium Cobalt Oxides
And you will most likely need to avoid contact with air (glovebox ? Controlled Atmosphere Furnaces ?) depending on what you are planning to do.If you are not confident with solgel synthesis and want to have a proper control on Co/Na ratio, I would rather recommend trying another methods (like solid state).
Kind regards,
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