Modulation of Surface Oxygen Defects on ZnO/ZnS Catalysts to Promote Photocatalytic H₂ Production

Abstract

Zinc oxide/zinc sulfide (ZnO/ZnS) microparticles with enriched surface oxygen defects (D so ) were prepared via a hydrothermal sulfurization modulated by doping sliver/copper ions (Ag + / Cu 2 + ). Microsized ZnO precursors with different structures were firstly prepared in the presence of Ag + /Cu 2 + . A subsequent surface sulfurization of the precursor led to the formation of ZnS nanostructure, forming ZnO/ZnS with modulated D so simultaneously. In addition, this in-situ sulfurization ensured the homogeneous distribution of Ag/Cu species with ZnO/ZnS (ACZS), which significantly improved the electric conductivity of these hybrid materials. Because of the structural, compositional, and defect features, the ACZS6 sample delivered a maximum photocatalytic hydrogen (H 2 ) production rate of 769 μmol g À 1 h À 1 with almost 100 % of rate retention even after 9 h under UV-vis light. Thus, this study may provide an efficient strategy to engineering oxygen defects within microsized photocatalysts for H 2 production.

Enhanced Photocatalytic Performance of a ZnO/CdS Heterostructure for Hydrogen Production and Mixed Dye Degradation

“…[9][10][11][12] However, the photocatalytic efficiency of ZnO is limited owing to its wide bandgap, low utilization of sunlight, and rapid recombination of photogenerated electrons and holes. [13][14][15][16][17] Many studies have shown that the photocatalytic performance of ZnO can be improved by noble metal deposition, [18,19] metal ion doping, [20][21][22] and heterojunction fabrication. [23][24][25] Among them, the construction of heterojunction is considered the simplest and most effective method.…”

“…ZnO is one of the most widely investigated semiconductor photocatalysts because of its chemical stability, nontoxicity, and low cost [9–12] . However, the photocatalytic efficiency of ZnO is limited owing to its wide bandgap, low utilization of sunlight, and rapid recombination of photogenerated electrons and holes [13–17] . Many studies have shown that the photocatalytic performance of ZnO can be improved by noble metal deposition, [18,19] metal ion doping, [20–22] and heterojunction fabrication [23–25] .…”

Advanced MnOx/MnWO4 hetero-nanoflakes with abundant oxygen vacancies for high-performance flexible asymmetric supercapacitors with high energy density

“…In addition, the higher content of Mo 3+ means the higher oxygen vacancy content. [29][30][31] Fig. 3d shows the highresolution O 1s spectra of MnO x /MnWO 4 @C-3 composites, which reveal three typical peaks at 530.87, 532.37 and 530.35 eV, representing lattice oxygen (O1), oxygen vacancy (O2) and oxygen species adsorbed on the surface (O3), respectively.…”