fig14

Figure 14. (A) XRD patterns of NCQDs, ZnS, and NCQD-modified ZnS. TEM images of (B) 0.25 wt.% NCQDs/ZnS and (C) its HRTEM. XPS spectra of NCQDs and 0.25 wt.% NCQDs/ZnS: (D) N 1s and (E) C 1s; (F) Catalytic stability of 0.25 wt.% NCQDs/ZnS and ZnS under full-spectrum irradiation (30 h, Xe lamp, 230 mW cm^-2). (G) Photocatalytic hydrogen evolution for ZnS, NCQDs, and NCQDs/ZnS with varying NCQDs content. (H) Proposed hydrogen production mechanism on NCQDs/ZnS. Copyright 2024, American Chemical Society^[27]. XRD: X-ray diffraction; NCQD: N-doped carbon quantum dot; ZnS: Zinc sulfide; TEM: transmission electron microscopy; HRTEM: high-resolution transmission electron microscopy; XPS: X-ray photoelectron spectroscopy.