Research On The Synthesis Of Co₃O₄,NiO Nanomaterials Via Solvothermal Route

The nanoporous metal oxides have attracted considerable attention of researchers because of their potential applications in the fields of photoelectric, catalysis, sensors etc. Synthesizing nanomaterials by solvothermal method is a noticeable field in material science. By this friendly method, well discreted and crystalline nanoparticles can be prepared, as well as toxic reaction can also be taken in this system.In this paper, we synthesized a kind of cobalt carbonate precursor with rhombohedral architectures firstly through an easy selected-control solvothermal process via the direct reaction in the presence of cobalt salt (Co(CH₃COO)₂·4H₂O), urea and sodium dodecyl sulfate (SDS) under ethanol-water (volume ratio, 1:1) solvent. We have explored the influences of all kinds of synthesis factors, including the amount and proportion of reagents, temperature, reaction time etc, on the synthesis results of the cobalt carbonate precursor. Through calcining procedure of the rhombohedral cobalt carbonate precursor, we obtained eventually the nanoporous Co3O4 with crystal and rhombohedral framework morphology. The calcined sample was characterized by XRD, FTIR, SEM, and Nitrogen adsorption–desorption measurement.In this work, the fourfold-reagents system of solvothermal strategy to synthesis of metal oxides with nanopores was extended to the synthesis of NiO. Nanoporous nickel oxide (NiO) was synthesized by thermal decomposition of the precursor obtained via a solvothermal method in the presence of NiCl₂·6H₂O, urea, SDS and ethanol. The as-prepared electrode materials exhibit favorable super capacitance. This result is analyzed with the microstructures of the samples including the BET surface areas and the pore structures.