Building sp carbon-bridged g-C3N4-based electron donor-π-acceptor unit for efficient photocatalytic water splitting

Edge-grafting carbon nitride with aromatic rings for highly-efficient charge separation and enhanced photocatalytic hydrogen evolution

“…The peaks at 709 and 976 are ascribed to the in-plane bending and bending vibration of CN (sp 2 ) in the heptazine ring of UCN. 39,40 At the same time, some characteristic peaks located at 1246, 1478, 1558, and 1628 cm −1 are consistent with the stretching vibration modes of the tri- s -triazine ring. 41,42 In addition, several new peaks appear in the spectra of UCN-NA and UCN-QL.…”

“…4b, two obvious spikes appear at 165.1 and 156.8 ppm for all the catalysts, originating from the sp 2 C atom (C2) linked with terminal –NH 2 groups and the sp 2 C atom (C1) connected to bridging N atoms (C–N 3 ) in the UCN framework, respectively. 39,46 An inferior signal at 96.4 ppm is seen in the spectra of UCN-NA and UCN-QL, which is assigned to the CC bond in the aromatic ring. 47 Moreover, compared with UCN, the modified sample exhibits a lower C 2 /C 1 peak area ratio, which results from the replacement of parts of –NH 2 groups by aromatic rings on the edge of the UCN framework.…”

“…The result indicates that non-radiative quenching channels formed by the edge-grafted samples enable more efficient formation of charges and faster charge transfer. 39…”

Surface Physicochemistry Modification and Structural Nanoarchitectures of g‐C3N4 for Wastewater Remediation and Solar Fuel Generation

“…[229] The occupancy of a donor-π-acceptor unit in grafted g-C 3 N 4 promotes the cocatalysts dispersion and deposition, besides facilitating photo-generated charges separation. [230] Table 7 lists the recent performances of various types of modified g-C 3 N 4 for photocatalytic hydrogen generation. The morphology of photocatalyst is crucial, as the surface-active sites can highly affect the hydrogen evolution rate.…”

Recent Advances in g-C3N4-Based Donor–Acceptor Photocatalysts for Photocatalytic Hydrogen Evolution: An Exquisite Molecular Structure Engineering

“…The authors also investigated the use of other aromatic heterocyclic compounds (i.e., pyridine, thiophene, and furan) to construct D-π-A type CN, all of which showed high H 2 production performance. In recent work, Lai et al 148 constructed sp-hybridized carbonbridge (alkynyl) CN with a D-π-A structure through a two-step postmodification method. The authors postulated that the presence of alkynyl was conducive to the transmission of PCCs between electron D-units (tri-s-triazine) and electron A-units (benzothiadiazole (BTD), bromobenzofurazan (BF)) due to its good conductivity.…”