Mesoporous NiCo2O4 Spinel: Influence of Calcination Temperature over Phase Purity and Thermal Stability

被引：78

作者：

Cabo, Moises ^{[1
]}

Pellicer, Eva ^{[1
]}

Rossinyol, Emma ^{[1
,2
]}

Castel, Onofre ^{[2
]}

Surinach, Santiago ^{[1
]}

Baro, Maria Dolors ^{[1
,2
]}

机构：

[1] Univ Autonoma Barcelona, Dept Fis, Fac Ciencies, E-08193 Bellaterra, Spain

[2] Univ Autonoma Barcelona, Fac Ciencies, Servei Microscopia, E-08193 Bellaterra, Spain

来源：

CRYSTAL GROWTH & DESIGN | 2009年 / 9卷 / 11期

关键词：

METAL-OXIDES; SURFACE; NANOSTRUCTURES; NANOPARTICLES; SILICA; SYSTEM; GROWTH;

D O I：

10.1021/cg900648q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Mesoporous NiCo2O4 spinel has been synthesized by nanocasting, using SBA-15 and KIT-6 silica its hard templates. Two temperatures of calcination were applied for the conversion of the spinel precursors (metal nitrates) into NiCo2O4. At 375 degrees C the pure spinel was obtained, whereas at 550 degrees 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 degrees C: the mesostructure of the pure spinel (calcined at 375 degrees C) collapsed, leading to the disruption of the porous network, while the mesoporosity of the powders calcined at 550 degrees 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.

引用

页码：4814 / 4821

页数：8

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