Abstract
Ordered mesoporous Co3O4 were synthesized by nanocasting method using three-dimensional cubic KIT-6 as hard template. The pore structure and textural characteristics of the samples were investigated by small-angle X-ray scattering (SAXS), field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), nitrogen adsorption and positron annihilation measurements. By varying the synthesis temperature of KIT-6 template, two mesoporous Co3O4 with different porosity were obtained. The porosity of Co3O4 was further tuned by subsequent spark plasma sintering (SPS) treatment. A high porosity of 45.5% was obtained in the Co3O4 sample prepared using KIT-6 template synthesized at 70 °C, which leads to an exceptionally ultralow thermal conductivity of 0.51 W m−1 K−1 at room temperature. Our results suggest that pore structure is a more effective way to reduce thermal conductivity in oxide materials.
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