**3. Selection of ceramic porous skeleton**

Porous ceramic skeletons are generally prepared from inorganic non-metallic powder materials by a molding process and high-temperature sintering, possessing a large number of irregular pore structures. For PCMs, especially inorganic salts, their low thermal conductivity and corrosion seriously affect industrial applications in solar thermal utilization, waste heat recovery, and other fields. Porous ceramics encapsulated PCM could effectively solve the above problems. The pore structure of porous ceramics is generally required to be open-pores, and particle stacking or precursor combustion is used to obtain a high porosity.

The selection of ceramic skeletons for medium-high temperature CPCMs generally must meet the following requirements:

