Construction of ZnIn₂S₄/CdS/PdS S‐Scheme Heterostructure for Efficient Photocatalytic H₂ Production

Abstract

It is facing a tremendous challenge to develop the desirable hybrids for photocatalytic H2 generation by integrating the advantages of a single semiconductor. Herein, an all‐sulfide ZnIn2S4/CdS/PdS heterojunction is constructed for the first time, where CdS and PdS nanoparticles anchor in the spaces of ZnIn2S4 micro‐flowers due to the confinement effects. The morphology engineering can guarantee rapid charge transfer owing to the short carrier migration distances and the luxuriant reactive sites provided by ZnIn2S4. The S‐scheme mechanism between ZnIn2S4 and CdS assisted by PdS cocatalyst is testified by in situ irradiated X‐ray photoelectron spectroscopy and electron paramagnetic resonance (EPR), where the electrons and holes move in reverse driven by work function difference and built‐in electric field at the interfaces. The optimal ZnIn2S4/CdS/PdS performs a glaring photocatalytic activity of 191.9 µmol h−1 (10 mg of catalyst), and the largest AQE (apparent quantum efficiency) can reach a high value of 26.26%. This work may afford progressive tactics to design multifunctional photocatalysts.

Cation Exchange Reaction-Mediated Photothermal and Polarity-Switchable Photoelectrochemical Dual-Readout Biosensor

“…Both obvious lattice spacing distances of 0.318 and 0.314 nm are consistent with the (102) crystal planes of the hexagonal ZnIn 2 S 4 phase (JPCDS no. 65-2023) . ZnIn 2 S 4 /Cu 2 S inherits the flower-like microsphere morphology absolutely (Figure D).…”

“…65-2023). 31 ZnIn 2 S 4 /Cu 2 S inherits the flower-like microsphere morphology absolutely (Figure 1D). The corresponding EDS mapping (Figure 1E) and inductively coupled plasma optical emission spectroscopy (ICP-OES) (Figure S4) certify that the introduced Cu would replace both Zn and In at a ratio of about 1:1.…”

“…ZnIn 2 S 4 microspheres were synthesized through a typical one-pot hydrothermal method. 31 According to the previous report, 1.0 mmol of Zn(AC) 2 •2H 2 O, 2.0 mmol of InCl 3 •4H 2 O, and 10 mmol of thioacetamide (TAA) were thoroughly dissolved in 70 mL of deionized water under constant stirring. Next, the pH of the mixture was adjusted to 5.0 with 1.0 M HCl.…”

Construction of a unique 2D/0D NiO/ZnCdS p–n hetero junction photocatalyst with highly improved photocatalytic H2 generation capacity

“…56 Among these, the 5% NiO/ZnCdS sample exhibited the lowest PL intensity, which was compatible with its maximum photocatalytic H 2 evolution activity. 57 Moreover, as revealed by the TRPL spectra (Fig. 7d) and the corresponding fitted results (Table S3, ESI †), the lifetimes of ZnCdS and 5% NiO/ZnCdS were 3.06 ns and 5.92 ns, respectively.…”

Progress and Outlook of Surface Engineering Strategies in Photocatalytic Materials for Mercury Removal: A Review

“…Xiao et al 151 used amorphous Ta 2 O 5 •3.3H 2 O nanoparticles as precursors to synthesize TaON photocatalysts with reduced particle size and low defect density by Zr doping and optimized nitriding time, which directly improved the efficiency of water decomposition into hydrogen and oxygen by an order of magnitude. Sun et al 152 constructed the ZnIn 2 S 4 /CdS/PbS ternary heterostructure for the first time to achieve efficient conversion of H 2 . Gogoi et al 153 prepared Ag/TiO 2 photocatalysts using an ascorbic acid chemical reduction method.…”