Mesoporous NiCo<inf>2</inf>O<inf>4</inf> spinel: Influence of calcination temperature over phase purity and thermal stability

Moisés Cabo, Eva Pellicer, Emma Rossinyol, Onofre Castell, Santiago Suriñach, Maria Dolors Baró

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65 Citations (Scopus)

Abstract

Mesoporous NiCo2O4 spinel has been synthesized by nanocasting, using SBA-15 and KIT-6 silica as hard templates. Two temperatures of calcination were applied for the conversion of the spinel precursors (metal nitrates) into NiCo2O4. At 375 °C the pure spinel was obtained, whereas at 550 °C NiO impurities were detected. The mesoporous powders obtained were characterized by transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller analysis, and magnetic measurements. In addition, their thermal stability was assessed by post heat-treating the materials at 550 °C: the mesostructure of the pure spinel (calcined at 375 °C) collapsed, leading to the disruption of the porous network, while the mesoporosity of the powders calcined at 550 °C was preserved. In all cases, the post-thermal treatment induced the segregation of NiO; the final NiO amount was found to be in the 7-10 wt % range. © 2009 American Chemical Society.
Original languageEnglish
Pages (from-to)4814-4821
JournalCrystal Growth and Design
Volume9
DOIs
Publication statusPublished - 4 Nov 2009

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