Structure-controlled CdS(0D, 1D, 2D) embedded onto 2D ZnS porous nanosheets for highly efficient photocatalytic hydrogen generation

Abstract

The morphological characteristics of a photocatalyst is central to its photocatalytic activity for solar energy conversion. Herein, Pt-ZnS/CdS composites comprising ZnS nanosheets, embedded via the geometry and size modulation and tuning of band gap of CdS with 0D, 1D or 2D structure, were investigated for solar hydrogen production. The photoactivity results indicate that the shape and morphology of CdS in the Pt-ZnS/CdS heterojunction play a pivotal role in affecting the photocatalytic performance. CdS with a 1D structure deposited on porous Pt-ZnS nanosheets endow the heterojunction with increased efficiency for the separation and transport of photoinduced electron-hole pairs. The proposed mechanism for the boosted suppression of charge recombination was further confirmed by the transient photocurrent response and photoluminescence.

Atomically thin 2D photocatalysts for boosted H2 production from the perspective of transient absorption spectroscopy

“…The combination of 2D materials with an 1D architecture like nanorods or nanowires is always very promising for the photocatalytic field, because of their unique optical properties riding on their quantum confinement along two directions. 77,95 The specific surface area is much higher in a 1D based composite than that in a 0D based composite, 96 which is a crucial factor in catalysis. Also, 1D structures might also act as substrates for the 2D flakes, which in turn enhance the stability of the system.…”

Two‐Dimensional Transition Metal Oxides and Chalcogenides for Advanced Photocatalysis: Progress, Challenges, and Opportunities

“…1D/2D: The features of 1D materials include a large aspect ratio, direct charge‐transport pathways, and low reflectance in light scattering and trapping. [ 296 ] In 1D/2D heterostructures, e.g., 1D CdS /2D SnS 2 , [ 297 ] 1D Cd 0.5 Zn 0.5 S/2D Co 0.85 Se NSs, [ 298 ] 1D C/2D MoSe 2 , [ 299 ] 1D Sb 2 S 3 /2D MoS 2 , [ 300 ] 1D WO 2.72 /2D ZnIn 2 S 4 , [ 301 ] 1D BiOI/2D ZnWO 4 , and [ 302 ] 1D BiPO 4 /2D BiOI, [ 303 ] the respective advantages of 1D and 2D materials can be integrated to tackle the drawbacks of a single material. [ 304 ] Wang et al introduced 2D CoS 2 NSs on the surface of 1D CdS to form a Z‐scheme heterostructure ( Figure a).…”

ReS2 Cocatalyst Improves the Hydrogen Production Performance of the CdS/ZnS Photocatalyst

“…Unfortunately, CdS is prone to photocorrosion under light and photogenerated carriers are easily compounded, which limit its wide application and development. − To solve this problem, researchers modified CdS, for example, by constructing heterojunctions and loading cocatalysts. − Lin et al greatly improved the efficiency and stability of photocatalytic hydrogen production by constructing CdS/ZnS heterojunctions . Because ZnS has a wide band gap with good stability and photocorrosion resistance, , combining CdS and ZnS can improve the photocatalytic hydrogen production activity. This has been widely investigated by many scholars. ,,− Although the CdS/ZnS heterojunction exhibits better photocatalytic performance than pure CdS and ZnS, it still suffers from low photoconversion efficiency and poor stability, which largely hinders its practical application.…”

“…Because ZnS has a wide band gap with good stability and photocorrosion resistance, , combining CdS and ZnS can improve the photocatalytic hydrogen production activity. This has been widely investigated by many scholars. ,,− Although the CdS/ZnS heterojunction exhibits better photocatalytic performance than pure CdS and ZnS, it still suffers from low photoconversion efficiency and poor stability, which largely hinders its practical application. Therefore, it is necessary to find new solutions.…”