Construction of 2D S‐Scheme Heterojunction Photocatalyst

Abstract

Semiconductor photocatalytic technology holds immense promise for converting sustainable solar energy into chemically storable energy, with significant applications in the realms of energy and the environment. However, the inherent issue of rapid recombination of photogenerated electrons and holes hinders the performance of single photocatalysts. To overcome this challenge, the construction of 2D S‐scheme heterojunction photocatalysts emerges as an effective strategy. The deliberate design of dimensionality ensures a substantial interfacial area; while, the S‐scheme charge transfer mechanism facilitates efficient charge separation and maximizes redox capabilities. This review commences with a fresh perspective on the charge transfer mechanism in S‐scheme heterojunctions, followed by a comprehensive exploration of preparation methods and characterization techniques. Subsequently, the recent advancements in 2D S‐scheme heterojunction photocatalysts are summarized. Notably, the mechanism behind activity enhancement is elucidated. Finally, the prospects for the development of 2D S‐scheme photocatalysts are presented.

Effective charge separation in photoelectrochemical water splitting: a review from advanced evaluation methods to materials design

“…In recent years, the Yu group introduced a novel concept called the step-scheme (S-scheme) based on the direct Z-scheme system. 202–204 This new model offers a more distinct and detailed definition of the interface changes and charge transfer process. Liu and coworkers introduced a two-step method for constructing an SnSe 2 /Sb 2 S 3 :Tm 3+ S-scheme heterojunction.…”

Facet-Dependent Fe2O3/BiVO4(110)/BiVO4(010)/Fe2O3 Dual S-Scheme Photocatalyst as an Efficient Visible-Light-Driven Peroxymonosulfate Activator for Norfloxacin Degradation

“…To address this, the construction of Z or S-scheme heterojunctions has been proposed. This approach not only enhances charge separation efficiency but also maintains the maximum redox potential of the composite system, which has been widely used in various photocatalytic fields. − Another effective solution to this issue is the integration of photocatalysis with PMS activation. In this approach, the photogenerated electrons are utilized to activate PMS, which leads to the generation of value-added reactive oxygen species (ROS), including ·OH and SO 4 ·– .…”

Strain and Electric Field Engineering of G-ZnO/SnXY (X, Y = S, Se) S-Scheme Heterostructures for Photocatalyst and Electronic Device Applications: A Hybrid DFT Calculation

“…This arrangement helps to promote the spatial separation of photogenerated carriers. 15 After excitation, the electrons in the CB of S−II recombine with the holes in the VB of S−I, so the electrons (holes) in the CB (VB) of S−I (S−II) are left and the strong redox ability of the initial monolayers (MLs) are retained. 18 More recently, IV−VI chalcogenides MLs have emerged as a new class of 2D semiconductors that are nontoxic, chemically and experimentally stable, and abundant on earth.…”