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Porous organic/inorganic nanocomposites were synthesized by sol–gel technique after the incorporation of nickel oxide (NiO) nanoparticles in carbon composite based on pyrogallol and formaldehyde (PF) using picric acid as catalyst. After a drying step, the samples were heated during 2 h at different pyrolysis temperatures from 600 to 1000 °C in tubular furnace under nitrogen atmosphere. The XRD pattern...
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