Cobalt dichloride hexahydrate CoCl2*6H2O
Cobalt dichloride hexahydrate CoCl2*6H2O (aqueous solution) has been applied as precursor for the growth of uniform and adherent Co3O4 thin films on glass substrates by solution spray pyrolysis technique. The structural, optical and electrical properties of the grown films were investigated by XRD (oriented growth of cubic structure observed), SEM (nanocrystalline grains along with some overgrown clusters), optical absorption (direct and indirect band gaps determined to be 2.10 and 1.60 eV, respectively). Semiconducting behavior of the electrical resistivity for Co3O4 films was observed; room temperature electrical resistivity was 1.5 × 103 Ω cm. Electrochemical supercapacitor properties in aqueous KOH electrolyte for possible application in energy storage devices were studied for the grown Co3O4 layers. The supercapacitor properties depicted that spray-deposited Co3O4 film is capable of exhibiting specific capacitance of 74 F/g. [[i]]
[i] V.R. Shinde, S.B. Mahadik, T.P. Gujar, C.D. Lokhande, Applied Surface Science, Vol. 252, Issue 20, 15 August 2006, Pages 7487-7492, « Supercapacitive cobalt oxide (Co3O4) thin films by spray pyrolysis »
http://www.sciencedirect.com/science/article/pii/S0169433205012602