Design And Construction Of Microcapsules Based On Phosphene Modified Hierarchical Structure Silicon Dioxide Polyaniline PCM

Phase change material(PCM)have been widely applied for thermal energy storage and thermoregulation.The PCM absorbs or releases heat with the environment through the phase change process.Microencapsulated phase change material(MEPCM)can effectively prevent the leakage of PCM during its melting,improve the thermal conductivity of PCM and reduce the supercooling effect.Also it is one of the most effective ways to store thermal energy.The preparation of phase change material microcapsule electrode materials to realize in-situ thermal management within energy devices is a research hotspot in recent years.As an excellent conductive polymer material,polyaniline can provide higher capacitance by using its larger specific surface area when it is used as a kind of shell materials of phase change material microcapsules.As a new member of two-dimensional materials,phosphoenene has superior electrochemical properties compared to other carbon-based materials.The electrical properties of the phase change material microcapsules can be enhanced by using phosphonene modified polyaniline.The silica/polyaniline hierarchical structure microcapsules were confirmed to have a fine structure by SEM and TEM.XPS,XRD,and FT-IR confirmed the successfully synthesis of the silica/polyaniline hierarchical structure from the chemical composition.The CV,GCD,and EIS of the microcapsules were tested using a three-electrode system,demonstrating that microcapsules can be used as electrode materials with a specific capacitance of 307.5 F/g at a scan rate of 0.2 A/g.After modifying polyaniline using phosphonene and carbon nanotubes,it was confirmed by SEM and TEM that the phosphonene and the carbon nanotubes were successfully compounded with polyaniline.XPS and FT-IR have chemically proven the successfully modified polyaniline by phosphoenene and carbon nanotubes.The three-electrode test system showed that the electrical properties of phosphonene and carbon nanotubes modified polyaniline were significantly improved.The specific capacitance measured under the condition of 0.2 A/g could reach 338.3 F/g and 320.8 F/g,respectively.And the electrical properties test of various microcapsules at different temperatures indicates that the microcapsules have a good in-situ thermal management.