A novel nanocomposite composed of graphene-like MoS₂ sheets and Zn_xCd_1−xS nanoparticles was used for photocatalytic hydrogen generation under visible light irradiation.

In this paper, a manganese phthalocyanine (MnPc) covalently functionalized graphene nanohybrid (MnPcG) has been successfully synthesized via 1,3-dipolar cycloaddition, and used as a photocatalyst after modifying it with platinum nanoparticles via photodeposition. The nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis, Fourier transform infrared (FTIR), and Raman spectroscopy. These characterization results confirmed the grafting of MnPc moiety onto the graphene sheets. The intermolecular electron transfer was facilitated and the photoexcited charges recombination was suppressed as confirmed by the fluorescence quenching and enhanced photocurrent density in MnPcG nanohybrid. In comparison to graphene, the MnPcG nanohybrid shows a substantial improvement in the photocatalytic hydrogen evolution. The yields of hydrogen production of MnPcG/Pt reached to 8.59 and 1.45 μmol mg⁻¹ under 10 h of UV-vis and visible light (λ > 400 nm) irradiation, respectively. This work demonstrates that metallophthalocyanines covalently functionalized graphene is a novel photocatalyst for solar energy conversion to produce hydrogen from water.

Recently, nitrogen‐doped graphene quantum dots (NGQDs), as a new type of quantum semiconductor and photoelectrochemical material, are promising candidates in photoelectric sensing, water splitting, and biological imaging and have various potential application prospects. In this work, NGQDs were prepared by a simple calcination method, and then a photoelectrochemical sensing platform based on the NGQDs electrode with superior photoelectrochemical activity was designed and fabricated for the detection of dopamine (DA). Benefitting from the quantum effect and size effect, NGQDs displayed an enhanced photocurrent effective within ultra‐low detection limit (0.03 μ m ), wide detection range (0.03–450 and 450–9680 μ m ), and high sensitivity in detecting DA with the assistance of ultraviolet light irradiation. The NGQDs electrode also showed continuous and stable photocurrent densities after long‐term experiment, indicating the excellent durability of NGQDs for DA detection.

A novel heterogeneous hybrid composed of Nb ₂ O ₅ microspheres and reduced graphene oxide as photocatalyst exhibits superior photocatalytic activity and stability.

A novel ternary nanocomposite comprising mesoporous WO₃, Mn₃O₄ nanoparticles and N-doped graphene demonstrated enhanced photoactivity for O₂ evolution from water.