Ultrastable porous organic/inorganic polymers based on polyhedral oligomeric silsesquioxane (POSS) hybrids exhibiting high performance for thermal property and energy storage

In our work, we have been synthesized two-hybrid porous organic-inorganic microporous polymers (POIPs) through a simple and friendly Heck coupling reaction at a moderate temperature of cubic octavinylsilsesquioxane (OVS) with brominated fluorene (F-Br-2) and anthraquinone (A-Br-2); respectively, to afford POSS-F-POIP and POSS-A-POIP. FTIR, solid-state C-13, and Si-29 NMR spectroscopy analyses were carried out to confirm the chemical structures of these POIP materials and the presence of POSS units within their framework. TGA measurements revealed that POSS-A-POIP possesses high thermal stability (T-d10: 600 degrees C, and char yield: 83 wt%) due to the presence of rigid anthraquinone and POSS units. Furthermore, POSS-A-POIP features pseudocapacitor with high symmetry and high specific capacitance of 152.5 F g(-1) at 0.5 A g(-1) when compared with the POSS-F-POIP (36.2 F g(-1) at 0.5 A g(-)1()). The excellent energy storage performance of POSS-A-POIP could be attributed to the Faradaic reaction of anthraquinone and the pi-conjugated system.

Automated summary

In this study, two-hybrid porous organic-inorganic microporous polymers (POIPs) were synthesized through a simple Heck coupling reaction. One of the materials, POSS-A-POIP, exhibited high thermal stability and excellent energy storage performance due to the presence of rigid anthraquinone and POSS units. The Faradaic reaction of anthraquinone and the pi-conjugated system in POSS-A-POIP contributed to its outstanding energy storage capabilities.