Fabricate Globular Flower-like CuS/CdIn₂S₄/ZnIn₂S₄ with High Visible Light Response via Microwave-assisted One–step Method and Its Multipathway Photoelectron Migration Properties for Hydrogen Evolution and Pollutant Degradation

Abstract

The photocatalyst CuS/CdIn 2 S 4 /ZnIn 2 S 4 with attractive visible light absorption was prepared by a microwave-assisted one-step method and then characterized by XRD, XPS, UV−vis/DRS, N 2 adsorption−desorption, SEM, TEM, and HRTEM tests. The results show that there are two kinds of crystal structures, hexagonal and cubic phase, in the product. Moreover, the composite has an absorption edge as high as 670 nm with a high visible light response. In addition, the composite possesses an excellent surface area of 239.3 m 2 /g, displays a favorable globular flower-like surface morphology, and consists mostly of three disparate shapes of crystals in the microstructure. Compared to heterogeneous ZnIn 2 S 4 and P25, as-prepared composite demonstrates the greatest photocatalytic activity under simulated sunlight and visible light by methyl orange degradation. Together with Pt loading as a cocatalyst, hydrogen was achieved over CuS/CdIn 2 S 4 /ZnIn 2 S 4 in Na 2 S−Na 2 SO 3 aqueous solution, leading to a hydrogen production rate of 358.4 μmol•h −1 •g −1 under simulated sunlight and a high hydrogen production rate of 233.9 μmol•h −1 •g −1 under visible light (λ > 420 nm). Additionally, the related formulas were utilized to calculate the semiconductor energy band configuration and speculate on the possible photoreaction mechanism of CuS/CdIn 2 S 4 /ZnIn 2 S 4 . Finally, the effect of multipathway photoinduced charge migration during photocatalysis process was explained. KEYWORDS: Microwave-assisted one-step method, CuS/CdIn 2 S 4 /ZnIn 2 S 4 , Visible light response, Hydrogen evolution, Charge transfer

Facile thermal exfoliation of Cu sheets towards the CuO/Cu2O heterojunction: a cost-effective photocatalyst with visible-light response for promising sustainable applications

“…The working electrodes were made by dip-coating 10 mL of product slurry (5 mg mL À1 ) onto titanium plates (1 Â 1 cm 2 ), followed by air drying at 100 C. The electrolyte was a KCl aqueous solution at a concentration of 0.1 M. The organic pollutant removal (RhB) experiments were carried out using a photocatalytic online analysis system (Beijing PerfectLight Technology Co./LabSolar-IIIAG), and a 300 W Xe-lamp with a 420 nm cut-off (PLS-SXE300/300UV) was chosen as the visible light source as previously reported by our group. 43,44 Briey, 0.05 g powders were dispersed in 50 mL aqueous RhB (20 mg L À1 ) under sonication. Before illumination, the suspension was stirred for 30 min in the dark to reach an adsorption-desorption equilibrium.…”

Novel MnS/(InxCu1-x)2S3 composite for robust solar hydrogen sulphide splitting via the synergy of solid solution and heterojunction

“…It is worth noting that the MIC3.0 sample exhibits completely different behaviour. An additional absorption region ranging from 600 to 800 nm was observed for MIC3.0, [33] which could be attributed to the absorption of CuS (Fig. S3).…”

Metal Chalcogenides Based Heterojunctions and Novel Nanostructures for Photocatalytic Hydrogen Evolution

“…This work offers a band structure engineering strategy to fabricate highly efficient photocatalysts. Chen et al constructed CuS/CdIn 2 S 4 /ZnIn 2 S 4 photocatalysts via a microwave assisted one-step method (Figure 8c) [36]. The hybrid composite possessed a large surface area and visible light response with an absorption edge of~670 nm.…”

“…Adapted with permission from[35]; (c) energy band structure and corresponding photocatalytic reaction mechanism for H 2 production over the CuS/CdIn 2 S 4 /ZnIn 2 S 4 composite in Na 2 S−Na 2 SO 3 aqueous solution. Adapted with permission from[36].…”