Preparation of CdSySe1 −y‐MoS2 Heterostructures via Cation Exchange of Pre‐Epitaxially Synthesized Cu2−χSySe1−y‐MoS2 for Photocatalytic Hydrogen Evolution

Cu2 −χSySe1 −y‐MoS2 epitaxial heterostructures are synthesized by a facile one ‐pot wet‐chemical method. They can be transformed to CdSySe1 −y‐MoS2 without morphological change via cation exchange. The CdSySe1 −y‐MoS2 heterostructures with different chalcogen ratio and loading amount of MoS2 are used as photocatalysts in the photocatalytic hydrogen evolution under visible light irradiation, exhibiting distinctive catalytic activities. AbstractConstruction of 2D transition metal dichalcogenide (TMD) ‐based epitaxial heterostructures with different compositions is important for various promising applications, including electronics, photonics, and catalysis. However, the rational design and controlled synthesis of such kind of heterostructures still remain challenge, especially for those consis ting of layered TMDs and other non‐layered materials. Here, a facile one‐pot, wet‐chemical method is reported to synthesize Cu2 −χSySe1 −y‐MoS2 heterostructures in which two types of different epitaxial configurations, i.e., vertical and lateral epitaxies, coexist. The chalcogen ratio (S/Se) in Cu2 −χSySe1 −y and the loading amount of MoS2 in the heterostructures can be tuned. Impressively, the obtained Cu2 −χSySe1 −y‐MoS2 heterostructures can be transformed to CdSySe1 −y‐MoS2 without morphological change via cation exchange. As a proof ‐of‐concept application, the obtained CdSySe1 −y‐MoS2 heterostructures with controllable composi...

Source: Small - February 19, 2021 Category: Nanotechnology Authors: Junze Chen, Xue ‐Jun Wu, Qipeng Lu, Meiting Zhao, Peng‐Fei Yin, Qinglang Ma, Gwang‐Hyeon Nam, Bing Li, Bo Chen, Hua Zhang Tags: Communication Source Type: research