This contribution investigates whether cobalt(II) and nickel(II) chlorides can, in one step, be converted to their corresponding oxides in aqueous solutions by electrodeposition. We use the chemical precipitation method as a blank experiment, and the electrodeposition is carried out directly in a self-made electrolytic cell with CoCl 2 ⋅ 6H 2 O or NiCl 2 ⋅ 6H 2 O as raw material. The crystal structure, morphology, and specific surface area of the product are characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), thermog-ravimetric analysis (TG), and Brunauer-Emmett-Teller (BET) measurements. The results show that the existence of an electric field has an obvious influence on the performance of the product. CoCl 2 can realize the one-step preparation of Co 3 O 4 in an aqueous solution, but the product prepared with NiCl 2 as the raw material is Ni(OH) 2 , which needs to be further calcined to obtain NiO. Therefore, it is necessary to further study the prerequisites for the one-step preparation of oxides from metal chloride in an aqueous solution.
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