Three-dimensional interconnected porous TiO2 ceramics for high-temperature thermal storage

Abstract

Porous TiO2 ceramics (PTC) with uniform, controllable, 3D fully interconnected pore structure and high porosities were prepared by a facile particle-stabilized emulsion templating method, and adjustable porosity of PTC could be obtained by controlling its solid content from 20 to 35 wt %. The Na2SO4 were selected as the high temperature phase change material and PTC as the support material, a kind of novelty form stable composite phase change material with high heat storage capacity and excellent shape stability were manufactured by impregnation under high temperature condition, which named PTCN1-4. SEM results showed that the Na2SO4 were evenly distributed into the pores of PTC, XRD and FT-IR tests confirmed the excellent chemical compatibility between Na2SO4 and PTC. The maximum melting enthalpy and solidification enthalpy of the composite phase change material were 212.6 and 161.0 J/g, respectively, and the corresponding maximum impregnation ratio reached 96.9%. TGA results showed that composite phase change material had excellent thermal stability in high temperature range. Therefore, PTC is a promising high temperature heat storage carrier material.