Preparation of a novel PEG composite with halogen-free flame retardant supporting matrix for thermal energy storage application

► Fire retardant shape-stabilized PEG composite was prepared by in situ sol-gel method. ► Composite was composed of inorganic-organic hybrid flame retardant supporting matrix. ► PEG composite had large latent heat and good thermal reliability. ► Novel supporting matrix increased fire retardancy and thermal stability of composite. ► PEG composite had potential to be utilized in thermal energy storage application.