Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Abstract

As the demand of fossil fuels continues to expand, hydrogen energy is considered a promising alternative energy. In this work, the NiTiO 3 −CuI-GD ternary system was successfully constructed based on morphology modulation and energy band structure design. First, the one-pot method was used to cleverly embed the cubes CuI in the stacked graphdiyne (GD) to prepare the hybrid CuI-GD, and CuI-GD was anchored on the surface of NiTiO 3 by simple physical stirring. The unique spatial arrangement of the composite catalyst was utilized to improve the hydrogen production activity under light. Second, to combine various characterization tools and energy band structures, we proposed an step-scheme (S-scheme) heterojunction photocatalytic reaction mechanism, among them, the tubular NiTiO 3 formed by the selfassembled of nanoparticles provided sufficient sites for the anchoring of CuI-GD, and the thin layer GD acted as an electron acceptor to capture a large number of electrons with the help of the conjugated carbon network; cubes CuI could consume holes in the reaction system; the loading of CuI-GD greatly improved the oxidation and reduction ability of the whole catalytic system. The S-scheme heterojunction accelerated the transfer of carriers and improved the separation efficiency. The experiment provides a new insight into the construction of an efficient and eco-friendly multicatalytic system.

Snowflake-like Cu2S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution

“…Compared to LDH-2, the composite catalyst LDH-2@Cu 2 S has the lowest initial potential; this might be due to the fast electron transfer from the LDH-2@Cu 2 S interface to the active species surface to reduce the H 2 O molecules. Thus, the decrease in reaction potential is closely related to the formation of the p–n heterojunction, which accelerated the transfer of photogenerated carriers; , this result confirmed that the LDH-2@Cu 2 S heterojunction has a significant effect on the HER activity. Figure d shows the flat band potential ( E fb ) of LDH-2, which is −0.59 eV.…”

Zeolitic Imidazolate Framework-67-Derived P-Doped Hollow Porous Co3O4 as a Photocatalyst for Hydrogen Production from Water

“…As shown in Figure g, the polycrystalline bright spots are obvious in the figure. The distribution area is wide, and there are amorphous circles at the same time, indicating that the composite material shows a mixed structure of a high-crystalline state and a low-crystalline state. , The energy-dispersive X-ray (EDX) image of P@Co 3 O 4 can prove the presence of O, Co, and P elements (Figure h). At the same time, the elemental mapping analysis of P@Co 3 O 4 (Figure i) shows that O, Co, and P are dispersed in the polyhedral structure.…”

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

“…Furthermore, when comparing the hydrogen production performance of GDY–CuBr with other systems reported in the literature of the same type, GDY–CuBr has prominent superior hydrogen evolution activity. 67,68 As shown in Table 2, the comparison results demonstrate that the hydrogen evolution of GDY–CuBr has a higher performance than previously reported literature. This result indicates the great potential of GDY–CuBr in the field of photocatalysis.…”