A heptazine-based polymer photocatalyst with donor-acceptor configuration to promote exciton dissociation and charge separation

Construction of type II ZnBi2O4/g-C3N4 heterojunction photocatalysts for efficient degradation of acid red B

“…7a demonstrates that the charge transfer resistance of composite ZBN is lower than that of monomer ZnBi 2 O 4 , implying that ZBN demonstrates a decreased charge transfer resistance and more rapid interfacial charge transfer. 62…”

“…7a demonstrates that the charge transfer resistance of composite ZBN is lower than that of monomer ZnBi 2 O 4 , implying that ZBN demonstrates a decreased charge transfer resistance and more rapid interfacial charge transfer. 62 In order to evaluate the effectiveness of photogenerated electron-hole separation, the photocurrent densities of the produced samples were investigated. Fig.…”

Band-structure tunability via the modulation of excitons in semiconductor nanostructures: manifestation in photocatalytic fuel generation

“…In contrast, for BCN, the Fermi level is situated in the mid-band gap, which indicates the presence of a strong localized charge density around tri-s-triazine. Recently, the introduction of a donor-acceptor interface in heptazine-based polymeric g-C 3 N 4 , namely BPCN, resulted in a lower band gap compared to normal polymeric g-C 3 N 4 (PCN), as reported by Xie et al 83 Significantly, the Frenkel exciton gets relaxed to a charge transfer (CT) exciton due to the creation of a donor-acceptor interface, and then dissociates to free charge carriers. 84 The Frenkel excitons relax to CT excitons, which provide excess energy to dissociate into free charge carriers, and the electrons move towards the LUMO of the acceptor, as shown in Fig.…”

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

“…Different from inorganic photocatalysts, organic photocatalysts have unique superiorities, such as an earth-abundant natural resource, flexible structure design, and easily tuned energy band structures. 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. , …”