Novel CuBr-assisted graphdiyne synthesis strategy and application for efficient photocatalytic hydrogen evolution

Abstract

As a new allotrope of carbon, graphdiyne (GDY) also shows great potential in photocatalysis based on the characteristics of narrow bandgap and high electron-hole mobility. This work synthesized the GDY-CuBr...

Phosphorus-modified two-dimensional graphdiyne (CnH2n−2)/ZnCdS forms S-scheme heterojunctions for photocatalytic hydrogen production

“…52 In the case of GDY and GDY-P, the peak intensity of GDY-P was weaker than that of GDY after calcination at 300 °C, indicating that unstable O and N substances decomposed together with the evolution of the graphdiyne structure. The characteristic peaks located at 1446 cm −1 and 1533 cm −1 in the curves of the GDY 27 and GDY-P sample are the stretching vibration of the benzene ring, which were also detected for ZGP-7, but their intensity was weaker due to the low content of GDY-P. Fig.…”

“…52 In the case of GDY and GDY-P, the peak intensity of GDY-P was weaker than that of GDY after calcination at 300 °C, indicating that unstable O and N substances decomposed together with the evolution of the graphdiyne structure. The characteristic peaks located at 1446 cm −1 and 1533 cm −1 in the curves of the GDY 27 and GDY-P sample are the stretching vibration of the benzene ring, which were also detected for ZGP-7, but their intensity was weaker due to the low content of GDY-P. Fig. 1(d) exhibits the Raman spectra of GDY and GDY-P, where the peak at 1348.10 cm −1 corresponds to the breathing vibration of the sp 2 -hybrid carbon in the benzene ring, and the peaks at 1930.53 cm −1 and 2177.34 cm −1 are the breathing vibration of –CC– in GDY.…”

“…GDY not only inhibited the aggregation of the CdS nanoparticles, but also effectively promoted the separation of photogenerated electron hole pairs in CdS. [26][27][28] In their article published in Nature Communications in 2020, Wang et al 29 described titanium dioxide nanofiber composites modified by graphite alkyne, which exhibited bone induction capability and enhanced photocatalytic antibacterial activity, and could effectively prevent implant infection.…”

Graphdiyne-based photocatalysts for solar fuel production

“…[130][131][132] For instance, Li et al synthesised a graphdiyne/CuBr composite using CuBr as a substrate for photocatalytic hydrogen evolution. 133 Due to the suitable band arrangement between graphdiyne and CuBr, a p-n heterojunction is formed between them. As an electron acceptor, the graphdiyne effectively promotes the separation and transfer of carriers and the adsorption and mass transfer of reactants.…”

In situconstruction of graphdiyne based heterojunctions by a deprotection-free approach for photocatalytic hydrogen generation

“…In these processes, GDY was firstly synthesized on Cu substrates and the exfoliated GDY powder was then hybridized with other semiconductors, which is time-consuming and usually results in localized heterojunctions. Very recently, some GDY-based heterojunctions were fabricated by directly growing GDY on the other semiconductors including CuI/GDY, 27 CuBr/GDY 28 and NiTiO 3 /CuI/GDY, 29 enabling GDY to uniformly cover other semiconductors. However, the reported in situ growth method is limited to Cu-based semiconductors and requires the pre-synthesis of hexaethynylbenzene (HEB) monomer via a complex deprotection of hexa[(trimethylsilyl)ethynyl]benzene (HEB-TMS).…”