Oxidizing synthesis of Ni2+–Mn3+ layered double hydroxide with good crystallinity

Ni2+–Mn3+ layered double hydroxide (LDHs) with good crystallinity and uniform morphology has been hydrothermally synthesized at 180 °C for 2 days using urea as hydrolysis agent and ammonium peroxodisulfate as oxidant. The obtained Ni2+–Mn3+ LDHs material has been characterized by XRD, SEM, XPS, FT-IR, and TG–DTA. Ammonium peroxodisulfate as oxidant plays an important role for the formation of Ni2+–Mn3+ CO32− LDHs material, and Mn2+ ions are oxidized into Mn3+ ones during the precipitation of Mn2+ ions, giving rise to layered hydroxide with the hydrotalcite structure. Ni2+–Mn3+ LDHs material with Ni/Mn molar ratio of 4 has a layered structure with a basal spacing of 0.739 nm. The morphology, size, and uniformity of the as-prepared materials connect with the hydrothermal treatment temperatures, and uniform and regular flowerlike spheres with a mean lateral size of 3.5 μm are observed for Ni2+–Mn3+ LDHs material with good crystallinity and uniform morphology.

Ni2+–Mn3+ layered double hydroxides (LDHs) with good crystallinity and uniform morphology has been hydrothermally fabricated urea as hydrolysis agent and ammonium peroxodisulfate as oxidant, which shows uniform and regular flowerlike sphere with a mean lateral size of 3.5 μm.Figure optionsDownload as PowerPoint slideHighlights
► Ni2+–Mn3+ LDHs material with good crystallinity and regular flowerlike sphere.
► Ni2+–Mn3+ LDHs material has a layered structure with a basal spacing of 0.739 nm.
► The particle size of Ni2+–Mn3+ LDHs material is about a mean lateral size of 3.5 μm.
► Ammonium peroxodisulfate plays an important role for the formation of Ni2+–Mn3+ LDHs material.