Enhanced thermal and porous properties of double-decker-shaped polyhedral silsesquioxane-bismaleimide (DDSQ-BMI) nanocomposites for high-performance CO2 storage and supercapacitors

Abstract

In this study, we employed nadic anhydride (ND), which was covalently bound to double-decker silsesquioxane (DDSQ) by hydrosilylation. The terminal aromatic diamine was connected to DDSQ-ND by maleic anhydride (MA) through a dehydration reaction to form DDSQ-bismaleimide (DDSQ-BMI) products. The values of thermal decomposition temperature (T_d) and char yield were significantly increased after thermal curing of DDSQ-BMI products as compared to pure BMI without the DDSQ inorganic cage. Among the various thermal curing procedures, DDSQ-MDA-BMI heated at 480 °C for 6 h possessed a highly microporous structure with a significantly large surface area (826 m² g⁻¹) and displayed high CO₂ gas storage and capture at 273 K under 1.0 bar (7.71 wt%). In addition, it displayed excellent specific capacitance (73.66 F g⁻¹) and satisfactory capacitance retention (86.4%).