Toward high-performance dibenzo[g,p]chrysene-based conjugated polymer photocatalysts for photocatalytic hydrogen production through donor-acceptor-acceptor structure design

Molecular Engineering in D-π-A-A-Type Conjugated Microporous Polymers for Boosting Photocatalytic Hydrogen Evolution

“…The increased hydrophilicity of the polymers could strengthen the interaction of aqueous reaction solution with the catalyst surface, contributing to the reduction reaction of H + . The scanning electron microscope (SEM) images demonstrated that PyT-BTDO-1 and PyT-BTDO-2 have a relatively uniform nanoparticle morphology, while the semi-crystalline PyT-BTDO-3 and PyT-BTDO-4 present a loose nanosheet morphology (Figure e–h), ascribed to the enhanced π–π interaction between the linear macromolecular chains as the BTDO content increased. , …”

“…The crystallinity for the four polymers increased with the content of BTDO, as revealed by the continuously enhanced intensity of diffraction peaks from PyT-BTDO-1 to PyT-BTDO-4 (Figure 1c), which can be imputed to the effect of π−π stacking between the linear micromolecular chains owing to the high BTDO content. 25,41 Nitrogen adsorption/ desorption measurement demonstrated that the specific surface area is orderly decreased from PyT-BTDO-1 to PyT-BTDO-4 with increasing the BTDO content (Figure 1d), attributed to the increased linear structure in the polymer skeletons due to the increased feed ratio of the dibromo-functionalized BTDO monomer. As shown in Figure S1, the pore size for the resulting polymers continuously increased with the BTDO content from PyT-BTDO-1 to PyT-BTDO-4 since the high content of BTDO with two linking sites increased the strut length between the two neighboring knots in the polymer chains.…”

“…In the past years, organic semiconductive photocatalysts with a conjugated molecular skeleton have been broadly exploited for hydrogen evolution, such as organic small molecules, − graphitic carbon nitrides, − crystalline porous organic polymers, − and amorphous conjugated microporous polymers (CMPs). − Among them, CMP photocatalysts manifest the advantages for hydrogen generation because of the high contact area between the catalyst surface and reaction medium, high structural stability, and three-dimensional extended conjugated polymer skeletons, which are conducive to a photocatalytic hydrogen production reaction. Impressively, some attractive progress has been made on CMP photocatalysts for hydrogen production under natural sunlight outdoor. , …”

“…Impressively, some attractive progress has been made on CMP photocatalysts for hydrogen production under natural sunlight outdoor. 25,26 Since the first example of CMPs for photocatalytic hydrogen production in 2015, 27 numerous building blocks have been developed for building donor-π-acceptor (D-π-A)-or donoracceptor (D-A)-type CMP photocatalysts because the inherent charge separation feature in the D-A or D-π-A polymers could promote the photocatalytic activity for hydrogen production. 28−30 Nevertheless, most of these reported photoactive CMP catalysts still display low visible light activity because of their weak absorption abilities in the visible light region.…”

Side-Chain-Assisted Transition of Conjugated Polymers from a Semiconductor to Conductor and Comparison of Their NO2 Sensing Characteristics

“…Therefore, the design of a side chain capable of specific interaction with an analyte to improve the detection sensitivity of CP-based electronic sensors is in high demand. In addition, since the porous morphology of CP can facilitate gas diffusion and enlarge the reactive surface area [ 24 , 25 , 26 , 27 , 28 ], CP films with porous structures have been reported to provide enhanced gas detection capabilities [ 29 , 30 ].…”