In situ Integration of a Metallic 1T‐MoS₂/CdS Heterostructure as a Means to Promote Visible‐Light‐Driven Photocatalytic Hydrogen Evolution

Abstract

The replacement of expensive noble‐metals cocatalysts with inexpensive, earth‐abundant, metallic nonmetal materials in most semiconductor‐based photocatalytic systems is highly desirable. Herein, we report the fabrication of stable 1T‐MoS2 slabs in situ grown on CdS nanorods (namely, 1T‐MoS2@CdS) by using a solvothermal method. As demonstrated by ultrafast transient absorption spectroscopy, in combination with steady‐state and time‐resolved photoluminescence, the synergistic effects resulting from formation of the intimate nanojunction between the interfaces and effective electron transport in the metallic phase of 1T‐MoS2 largely contribute to boosting the photocatalytic activity of CdS. Notably, the heterostructure with an optimum loading of 0.2 wt % 1T‐MoS2 exhibits an almost 39‐fold enhancement in the photocatalytic activity relative to that exhibited by bare CdS. This work represents a step towards the in situ realization of a 1T‐phase MoS2‐based heterostructure as a promising cocatalyst with high performance and low cost.

Enhanced photoelectrochemical and photocatalytic activities of CdS nanowires by surface modification with MoS2 nanosheets

“…Additionally, Raman spectra (Fig. 3b) analysis was applied to determine the crystal phase of MoS 2 [32,33].…”

“…12d and average lifetimes, there is significant difference in charge carrier dynamic of CdS in the presence of MoS 2 on the surface. Decorating 5% [33]. This fast electron transfer will prevent undesirable recombination of electron-hole, promote better charge separation and improve the catalytic activity of nanocomposite for the HER reaction (Fig.…”

Metal Sulfide Photocatalysis: Visible‐Light‐Induced Organic Transformations

“…The exploration of heterojunctions was a common strategy in the energy application for H 2 evolution. [48] There were some cases to explore the heterojunction between two different metal sulfides to enhance the charge transfers that improve the turnover of organic molecules. The semiconductor heterojunction between metal sulfides and metal oxides was a more popular strategy to achieve the same target.…”

Microwave Hydrothermal Synthesis of 1T@2H−MoS2 as an Excellent Photocatalyst

“…The presence of the 1T phase in 2HÀ MoS 2 tends to form a trap states. [46] According to the test results of UV-vis spectra, the 2HÀ MoS 2 band gap is about 1.9 eV, and the MÀ 1T@2HÀ MoS 2 band gap is narrowed to about 1.7 eV due to the introduction of the 1T phase, which broadens the response range in visible light. Under the driving of 1TÀ MoS 2 and the synergistic effect between 1T and 2H, those electrons on the conduction band of the 2H phase can reach 1T phase more quickly through the trapped states rather than recombination with the holes.…”