Metal Organic Frameworks-based Composite Phase change Materials
Phase change materials (PCMs) are a type of functional materials that can reversibly utilize latent heat during the phase change process to achieve thermal energy storage and utilization. Targeting the inherent shortcomings (leakage and low thermal conductivity) of pure PCMs, fabricating shape-stabilized composite PCMs by encapsulating PCMs into supporting materials is one of the most efficient ways. Ideal shape-stabilized composite PCMs should include the following features: high loading percentage, high latent heat, high thermal conductivity and good thermal stability. Compared with traditional supporting materials, metal organic frameworks (MOFs) are more promising for preparing shape-stabilized composite PCMs due to their diverse structural topologies, ultrahigh surface area, ultrahigh porosity, adjustable pore size, controllable surface properties and stable chemical properties. To design MOFs-based shape-stabilized composite PCMs with ideal thermal and other performances, we proposed three strategies: synthetic modification of MOFs functional groups, integration of MOFs with other functional materials and constructing 3D penetrating network structure. Experimental results indicate that compatible functional groups-modified MOFs with PCMs and constructing 3D network structure can help composite PCMs achieve superior thermal properties. Effective integration of MOFs with other functional materials (such as carbon quantum dots, CQDs) is conducive to developing multifunctional composite PCMs with multiple fascinating peculiarities and enhanced functional properties, which can be universally applied to versatile MOFs hosts and other functional guests.