Polyimide with enhanced π stacking for efficient visible-light-driven photocatalysis

Abstract

The organic semiconductor of polyimide has received considerable attention as a chemically stable donor-acceptor photocatalyst, yet exhibits moderate photocatalytic efficiency which is limited by low surface area, insufficient light harvesting...

Perovskite LaSrCoFeO6 Oxide Enabled Visible Light Catalytic Aerobic Epoxidation of Styrene

“…This is the first example of employing LSCF oxides as superior visible-light catalyst for epoxidation of styrene just using molecular oxygen as the oxidant. Relative with these (7.4 ~37.5 mmol • g cat À 1 • h À 1 ) of the reported catalysts coupled with either oxygen or TBHP [6,20,[33][34][35][36] (Table 1, entries 12-16), LSCF catalyst reported in this work shows the highest reaction rate of ~50 mmol • g cat À 1 • h À 1 (Table 1, entry 7). Additionally, LSCF catalyst even shows the considerable catalytic performance under visible light compared with the activity of LSCF-1.6 catalyst under ultraviolet light in our previous study.…”

“…The E a of the epoxidation of styrene obtained over LSCF with oxygen as oxidant is even higher than that of the reported value over Co 3 O 4 oxide with TBHP as oxidant. [33] Basis of the above results, it is concluded that the LSCF oxide was successfully employed as superior visible-light catalysts in epoxidation of styrene under aerobic condition. The high activity of LSCF catalyst for epoxidation of styrene could be associated with ROS.…”

Band structure engineering of a polyimide photocatalyst towards enhanced water splitting

“…The rapid electron-hole recombination in AD-PI might be due to the stronger p-p intermolecular interaction, which can accelerate the mobility of the charge carriers. 35,68 Furthermore, ESP spectra were performed to study the delocalization of p electrons. The tests were carried out in the dark and under visible light at 10 min.…”

“…27 However, the photocatalytic efficiency of pristine PI is still moderate because of the severe photogenerated charge recombination, unfavorable electronic band structure and poor surface reaction kinetics. To increase the photocatalytic efficiency, a number of different approaches have been investigated to date, such as doping, [32][33][34] comonomer tuning, [35][36][37][38][39] morphology engineering, [40][41][42] and composite structure design. [43][44][45][46][47][48][49] The most fundamental property of a semiconductor photocatalyst that directly affects its photocatalytic performance is its band structure.…”

g-C3N4: Properties, Pore Modifications, and Photocatalytic Applications

“…In the OSC family, conjugated polymers, g -C 3 N 4 [ 4 , 5 , 6 , 7 , 8 ], polypyrrole (PPy) [ 9 , 10 ], polyaniline (PANI) [ 11 , 12 ], polyimide (PI) [ 13 ], poly (3-hexylthiophene) (P3HT) [ 14 ], polyhydroxybutyrate (PHB) [ 15 , 16 ], etc., have been extensively used for photocatalytic purposes due to their broad, molecular-level tuning of optoelectronic properties. Among them, g -C 3 N 4 resembles graphene and has a unique two-dimensional (2D) delocalized conjugated structure, which is formed by an infinite extension of triazine ring (C 3 N 3 ) or tri-s-triazine ring (C 6 N 7 ) as basic structural units [ 17 ].…”