Ultrastable Porous Organic Polymers Containing Thianthrene and Pyrene Units as Organic Electrode Materials for Supercapacitors

In this study, we successfully synthesized, designed, and constructed three porous organic polymers (POPs) without or with acetylene as the bridge─Bz-Th, TPA-Th, and P-Th-POPs─through a robust and efficient coupling reaction of 2,8-dibromothianthrene (Th-Br2) as a building unit with 1,3,5-tris(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzene (Bz-3BO), tris(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)amine (TPA-3BO), and 1,3,6,8-tetraethynylpyrene (P-T). Our POP materials displayed exceptional heat stability (char yields of more than 70% for each POP) and superior Brunauer–Emmett–Teller surface areas. According to electrochemical testing, a P-Th-POP-containing acetylene group as a bridge has a specific capacitance of 217 F g–1 at 0.5 A g–1 and an excellent cycling stability of over 5000 times at 10 A g–1. Compared to other porous materials, P-Th-CMP exhibits the highest specific capacitance, which may be attributed to its enormous surface area and extended conjugation system.