In Situ X-ray Photoelectron Spectroscopy (XPS) Demonstrated Graphdiyne (g-C_nH_2n–2) Based GDY-CuI/NiV-LDH Double S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Abstract

As a new two-dimensional layered carbon material, graphdiyne (GDY) is widely used in various fields because of its excellent electrical conductivity and tunable electronic structure. In this work, graphdiyne, a two-dimensional layered carbon material, is prepared by an alkyl terminal coupling method using Cu+ as a catalyst. Nickel–vanadium hydro calcite (NiV-LDH) is anchored on the surface of GDY-CuI bya solvothermal method to form a double S-scheme heterojunction photocatalytic hydrogen precipitation system. The double S-scheme heterojunction suppressed the electron–hole recombination in the composite catalyst, which greatly improved the transfer rate of photogenerated carriers. Meanwhile, a tight and unique interface is formed in the composite, which not only accelerates the separation and transfer of electron holes but also improves the catalytic stability of the composite. H2 (73.65 μmol) is produced in 5 h in triethanolamine solution, which is 4.1 and 3.7 times higher than those with NiV-LDH and NiV-LDH/CuI. Twenty-five hour cycling experiments demonstrated the catalytic stability of the materials. This work provides an effective strategy for the rational construction and application of graphdiyne group hetero structures in the field of photocatalytic hydrogen evolution.

A low-cost and high-yield green preparation method of graphdiyne and hydrogen-substituted graphdiyne and their photocatalytic properties

“…The hydrogen evolution ability of H-GDY and GDY materials prepared using different halogenated hydrocarbons was intuitively demonstrated through the photocatalyst's hydrogen evolution experiment. 44 TEOA (15 vol% pH = 10) was used as a sacrificial reagent and EY (5 mg) was used as a photosensitizer to create an electron-rich environment for hydrogen evolution by the catalyst. Fig.…”

A 1T-WS2 “electron pump” regulates charge transfer over ZnCdS/NiV-LDH p–n heterostructures for enhanced photocatalytic hydrogen evolution

“…0.08 g of VCl 3 , 0.356 g of NiCl 2 ·6H 2 O, and 0.188 g of urea were added to 30 mL of water, sonicated for 5 min to completely dissolve them, the solution added to a reactor, reacted at 120 °C for 12 h, washed by centrifugation, and dried overnight at 60 °C to obtain the final product. 39…”

Graphdiyne Preparation and Application in Photocatalytic Hydrogen Evolution

“…GDY has become an excellent matrix for combining with other semiconductors. So far, a series of GDY-based heterojunction photocatalytic materials have been reported for photocatalytic hydrogen production, such as metal oxides, − sulfides, − carbon nitride, MOF, layered double hydroxide, , and so on.…”